057U7–04

05–294

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

459

Author:

Date:

2004 COROLLA (RM1037U)

ABS WITH EBD SYSTEM (April, 2003)

HOW TO PROCEED WITH TROUBLESHOOTING

1

Vehicle Brought to Workshop

2

Customer Problem Analysis (See page

05–296

)

3

Check and Clear DTCs and Freeze Frame Data (See page

05–297

)

4

Problem Symptom Confirmation

Symptom does not occur: Go to step 5

Symptom occurs: Go to step 6

5

Symptom Simulation (See page

01–30

)

6

DTC Check (See page

05–297

)

There is no output: Go to step 7

There is output: Go to step 8

7

Problem Symptoms Table (See page

05–307

)

Check for fluid leakage and Go to step 10

8

DTC Chart (See page

05–303

)

9

Circuit Inspection (See page

05–308

–

05–343

)

HINT:
When 2 or more DTC’s are recorded, and the problem is not identified, perform circuit inspection of the other
DTC’s.

–

DIAGNOSTICS

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05–295

460

Author:

Date:

2004 COROLLA (RM1037U)

10

Identification of Problem

11

Repair

12

Comfirmation Test

End

HINT:
Step 3, 6, 9, 12:
Diagnostic steps permitting the use of the hand–held tester.
Fail safe function:
When a failure occurs in the ABS system, the ABS warning light is lit and the ABS operation is prohibited.
In addition to this, when the failure which disables the EBD operation occurs, the brake warning light is lit
as well and the EBD operation is prohibited.

057U8–04

ABS Check Sheet

Inspector’s

Name

:

Customer’s Name

Date Vehicle
Brought In

Registration Date

Registration No.

Frame No.

Odometer Reading

/ /

/ /

Date Problem First Occurred

Frequency the Problem Occurs

/ /

Continuously

Intermittently ( times a day)

ABS does not operate.

ABS does not operate efficiently.

ABS Warning Light
Abnormal

Remains ON

Does not Light Up

DTC Check

1st Time

2nd Time

Normal Code

Malfunction Code (Code )

Normal Code

Malfunction Code (Code )

Symptoms

km

miles

Brake Warning
Light Abnormal

Remains ON

Does not Light Up

STOP LIGHT SW

SYSTEM

Freeze Frame Data

#IG ON

VEHICLE SPD

ON

OFF

NO SYS

ABS

FAIL SF

km/h

MPH

05–296

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DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

461

Author:

Date:

2004 COROLLA (RM1037U)

CUSTOMER PROBLEM ANALYSIS CHECK

057U9–04

C92542

C52361

Tc

CG

R01346

Normal Code

Code 11 and 21

Code 11

4 sec.

0.25 sec.

2.5 sec.

1.5 sec.

0.25 sec.

2 sec.

0.5 sec.

0.5 sec.

Code 21

ON

OFF

ON

OFF

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DIAGNOSTICS

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05–297

462

Author:

Date:

2004 COROLLA (RM1037U)

PRE–CHECK

1.

DIAGNOSIS SYSTEM

(a)

Release the parking brake lever.

(b)

Check the warning lights.
When the ignition switch is turned ON, check that the ABS
warning light and brake warning light goes on for 3 sec.

HINT:

When the parking brake is applied or the level of the brake
fluid is low, the brake warning light is lit.

If the indicator check result is not normal, proceed to trou-
bleshooting for the ABS warning light circuit (See page

05–332

or

05–335

) or brake warning light circuit (See

page

05–338

).

(c)

In case of not using hand–held tester:
Check the DTC.
(1)

Using SST, it connects terminal Tc and CG of DLC3.

SST

09843–18040

(2)

Turn the ignition switch to ON.

(3)

Read the DTC from the ABS warning light on the
combination meter.

HINT:

If not code appears, inspect the diagnostic circuit or ABS
warning light circuit (See page

05–332

or

05–335

).

As an example, the blinking patterns for normal code and
codes 11 and 21 are shown on the left.
(4)

Codes are explained in the code table on page

05–303

.

If 2 or more malfunctions are indicated at the same time, the
lowest numbered DTC will be displayed 1st.

(5)

After completing the check, remove the SST from
the DLC3.

SST

09843–18040

(d)

In case of using hand–held tester:
Check the DTC.
(1)

Read the DTC by following the prompts on the tes-
ter screen.

HINT:
Please refer to the hand–held tester operator’s manual for fur-
ther details.
(e)

In case of not using hand–held tester:
Clear DTC.
(1)

Using SST, it connects the terminal Tc and CG of the
DLC3.

SST

09843–18040

(2)

Turn the ignition switch to ON.

BR3890

05–298

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DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

463

Author:

Date:

2004 COROLLA (RM1037U)

(3)

Clear DTC stored in ECU by depressing the brake
pedal 8 or more times whitin 5 sec.

(4)

Check that the ABS warning light shows the normal
code.

(5)

Remove the SST from the DLC3.

SST

09843–18040

HINT:
Disconnect the battey cable during repairs will not erase the
DTC in the ECU.
(f)

In case of using hand–held tester:
Clear the DTC.
(1)

Turn the ignition switch to ON.

(2)

Operate the hand–held tester to erase the codes.

HINT:
Please refer to the hand–held tester operator’s manual for fur-
ther details.

2.

DATA LIST

HINT:
According to the DATA LIST displayed by the Hand–held tester, you can read the value of the switch, sensor,
actuator and so on without parts removal. Reading the DATA LIST as a first step of troubleshooting is one
of the method to shorten the labor time.
(a)

Connect the Hand–held tester to the DLC3.

(b)

Turn the ignition switch to ON.

(c)

According to the display on tester, read the ”DATA LIST”.

Item

Measurement Item /

Range (Display)

Normal Condition

Diagnostic Note

ABS MOT RELAY

ABS motor relay / ON or
OFF

SOL RELAY

Solenoid relay / ON or
OFF

STOP LIGHT SW

Stop light switch / ON or
OFF

ON : Brake pedal de-
pressed
OFF : Brake pedal re-
leased

PKB SW

Parking brake switch / ON
or OFF

ON : Parking brake applied
OFF : Parking brake re-
leased

ABS OPERT FR

ABS operation (FR) / BE-
FORE or OPERATE

BEFORE : No ABS opera-
tion (FR)
OPERATE : During ABS
operation (FR)

ABS OPERT FL

ABS operation (FL) / BE-
FORE or OPERATE

BEFORE : No ABS opera-
tion (FL)
OPERATE : During ABS
operation (FL)

ABS OPERT RR

ABS operation (RR) / BE-
FORE or OPERATE

BEFORE : No ABS opera-
tion (RR)
OPERATE : During ABS
operation (RR)

ABS OPERT RL

ABS operation (RL) / BE-
FORE or OPERATE

BEFORE : No ABS opera-
tion (RL)
OPERATE : During ABS
operation (RL)

–

DIAGNOSTICS

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2004 COROLLA (RM1037U)

Item

Diagnostic Note

Normal Condition

Measurement Item /

Range (Display)

WHEEL SPD FR

Wheel speed sensor (FR)
reading / min.: 0 km/h (0
MPH, max.: 326 km/h (202
MPH)

Actual wheel speed

Speed indicated on
speedometer

WHEEL SPD FL

Wheel speed sensor (FL)
reading / min.: 0 km/h (0
MPH, max.: 326 km/h (202
MPH)

Actual wheel speed

Speed indicated on
speedometer

WHEEL SPD RR

Wheel speed sensor (RR)
reading / min.: 0 km/h (0
MPH, max.: 326 km/h (202
MPH)

Actual wheel speed

Speed indicated on
speedometer

WHEEL SPD RL

Wheel speed sensor (RL)
reading / min.: 0 km/h (0
MPH, max.: 326 km/h (202
MPH)

Actual wheel speed

Speed indicated on
speedometer

IG VOLTAGE

ECU power supply voltage
/ NORMAL or TOO LOW

NORMAL : 9.5 V or over
TOO LOW : Below 9.5 V

SFRR

ABS solenoid (SFRR) ON /
OFF

SFRH

ABS solenoid (SFRH) ON /
OFF

SFLR

ABS solenoid (SFLR) ON /
OFF

SFLH

ABS solenoid (SFLH) ON /
OFF

SRRR

ABS solenoid

(

SRRR) ON /

OFF

SRRH

ABS solenoid (SRRH) ON
/ OFF

SRLR

ABS solenoid (SRLR) ON /
OFF

SRLH

ABS solenoid (SRLH) ON /
OFF

AIR BLD SUPPORT

Air bleed support /
SUPPORT or NOT SUP

Supported

TEST MODE

Test mode / NORMAL or
TEST

NORMAL : Normal mode
TEST : During test mode

#CODES

Number of DTC recorded /
min.: 0, max.: 255

Min.: 0, max.: 19

3.

ACTIVE TEST

HINT:
Performing the ACTIVE TEST using the Hand–held tester allows the relay, actuator and so on to operate
without parts removal. Performing the ACTIVE TEST as a first step of troubleshooting is one of the methods
to shorten the labor time.
It is possible to display the DATA LIST during the ACTIVE TEST.
(a)

Connect the Hand–held tester to the DLC3.

(b)

Turn the ignition switch to ON.

(c)

According to the display on tester, perform the ”ACTIVE TEST”.

05–300

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DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

465

Author:

Date:

2004 COROLLA (RM1037U)

Item

Vehicle Condition / Test Details

Diagnostic Note

SFRR

Turns ABS solenoid (SFRR) ON / OFF

Operation of solenoid
(clicking sound) can be
heard

SFRH

Turns ABS solenoid (SFRH) ON / OFF

Operation of solenoid
(clicking sound) can be
heard

SFLR

Turns ABS solenoid (SFLR) ON / OFF

Operation of solenoid
(clicking sound) can be
heard

SFLH

Turns ABS solenoid (SFLH) ON / OFF

Operation of solenoid
(clicking sound) can be
heard

SRRR

Turns ABS solenoid (SRRR) ON / OFF

Operation of solenoid
(clicking sound) can be
heard

SRRH

Turns ABS solenoid (SRRH) ON / OFF

Operation of solenoid
(clicking sound) can be
heard

SRLR

Turns ABS solenoid (SRLR) ON / OFF

Operation of solenoid
(clicking sound) can be
heard

SRLH

Turns ABS solenoid (SRLH) ON / OFF

Operation of solenoid
(clicking sound) can be
heard

SFRR & SFRH

Turns ABS solenoid SFRR & SFRH ON / OFF

Operation of solenoid
(clicking sound) can be
heard

SFLR & SFLH

Turns ABS solenoid SFLR & SFLH ON / OFF

Operation of solenoid
(clicking sound) can be
heard

SRRH & SRRR

Turns ABS solenoid SRH & SRR ON / OFF

Operation of solenoid
(clicking sound) can be
heard

SRLR & SRLH

Turns ABS solenoid SRLR & SRLH ON / OFF

Operation of solenoid
(clicking sound) can be
heard

SFRH & SFLH

Turns ABS solenoid SFRH & SFLH ON / OFF

Operation of solenoid
(clicking sound) can be
heard

SOL RELAY

Turns ABS solenoid relay ON / OFF

Operation of solenoid
(clicking sound) can be
heard

ABS MOT RELAY

Turns ABS motor relay ON / OFF

Operation of motor can be
heard

ABS WARN LIGHT

Turns ABS warning light ON / OFF

Observe combination me-
ter

BRAKE WRN LIGHT

Turns BRAKE warning light ON / OFF

Observe combination me-
ter

4.

FREEZE FRAME DATA

(a)

The vehicle (sensor) status memorized during ABS operation or at the time of error code detection can
be displayed using the hand–held tester.

(b)

Only one record of freeze frame data is stored and the freeze frame data generated during ABS opera-
tion are constantly updated. Also, the number of the ignition switch’s ”ON” after the freeze frame data
is stored can be memorized up to 31 and it can be displayed.

HINT:
If the ignition switch ”ON” operation exceeds 31 times, ”31” appears on the display.

C52361

Ts

CG

BR3904

0.13 sec.

ON

OFF

0.13 sec.

–

DIAGNOSTICS

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05–301

466

Author:

Date:

2004 COROLLA (RM1037U)

(c)

If the diagnosis code abnormality occurs, the freeze frame data at the occurrence of the abnormality
is stored but the ABS actuation data is deleted.

Hand–held tester display

Measurement Item

Reference Value*

VEHICLE SPD

Vehicle speed

Speed indication of a meter

STOP LIGHT SW

Stop light switch signal

Stop light switch ON: ON, OFF: OFF

# IG ON

Numbers of operations of ignition switch ON after
memorizing freeze frame data

0 – 31

SYSTEM

Operate system

ABS operate: ABS

*: If no conditions are specifically stated for ”Idling”, it means the shift lever is at N or P position, the A/C switch
is OFF and all accessory switches are OFF.

5.

SPEED SENSOR SIGNAL CHECK

HINT:
If the ignition switch is turned from ON to ACC or LOCK during
test mode, DTC will be erased.
(a)

In case of not using hand–held tester:
Check the speed sensor signal.
(1)

Turn the ignition switch to ON.

(2)

Using SST, it connects the terminal Ts and CG of
DLC3.

SST

09843–18040

(3)

Start the engine.

(4)

Check that the ABS warning light blinks.

HINT:
If the ABS warning light does not blink, inspect the ABS warning
light circuit and Ts circuit (See page

05–332

or

05–335

).

(5)

Drive the vehicle straight forward at the speed of 45
km/h (28 mph) or over for several seconds and
check that the ABS warning light comes off.

HINT:
The sensor check may not be completed if the wheels spin or
the steering wheels steered during check.

(6)

Stop the vehicle.

(7)

Using SST, it connects the terminal Tc and CG of the
DLC3.

SST

09843–18040

(8)

Read the number of blinks of the ABS warning light.

BR3893

ON

7

2

7

6

OFF

Malfunction Code (Example Code 72, 76)

0.5 sec.

4 sec.

Repeat

0.5 sec.

1.5 sec.

2.5 sec.

0.5 sec. 0.5 sec.

05–302

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DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

467

Author:

Date:

2004 COROLLA (RM1037U)

HINT:

See the list of DTC shown on the

05–303

.

If every sensor is normal, a normal code is output (A cycle
of 0.25 sec. ON and 0.25 sec. OFF is repeated).

If 2 or more malfunctions are indicated at the same time,
the lowest numbered code will be displayed.

(9)

After performing the check, turn the ignition switch
to OFF, and remove the SST from the DLC3.

SST

09843–18040

(b)

In case of using hand–held tester:
Check the speed sensor signal.
(1)

Do step (3) to (6) on the previous page.

(2)

Read the DTC by following the prompts on the tes-
ter screen.

HINT:
Please refer to the hand–held tester operator’s manual for fur-
ther details.

057UA–04

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

05–303

468

Author:

Date:

2004 COROLLA (RM1037U)

DIAGNOSTIC TROUBLE CODE CHART

NOTICE:
When removing the part, turn the ignition switch to OFF.
HINT:

Using SST 09843–18040, it connect the terminal Tc and CG of DLC3.

If any abnormality is not found when inspecting parts, inspect the ECU and ground points for poor con-
tact.

If a malfunction code is displayed during the DTC check, check the circuit listed that code. For details
of each code, turn to the page referred to under the ”See page” for respective ”DTC No.” in the DTC
chart.

When 2 or more DTC’s are recorded, and the problem is not identified, perform circuit inspection of
the other DTC’s.

DTC No.

(See Page)

Detection Item

Trouble Area

C0200/31

(

05–308

)

Right front wheel speed sensor signal malfunction

Right front speed sensor

Right front speed sensor circuit

Right front speed sensor rotor

C0205/32

(

05–308

)

Left front wheel speed sensor signal malfunction

Left front speed sensor

Left front speed sensor circuit

Left front speed sensor rotor

C0210/33

(

05–312

)

Right rear wheel speed sensor signal malfunction

Right rear speed sensor

Right rear speed sensor circuit

Right rear speed sensor rotor

C0215/34

(

05–312

)

Left rear wheel speed sensor signal malfunction

Left rear speed sensor

Left rear speed sensor circuit

Left rear speed sensor rotor

C0226/21

(

05–316

)

Open or short circuit in ABS actuator solenoid (SFR) circuit

Brake actuator

SFRR or SFRH circuit

C0236/22

(

05–316

)

Open or short circuit in ABS actuator solenoid (SFL) circuit

Brake actuator

SFLR or SFLH circuit

C0246/23

(

05–316

)

Open or short circuit in ABS actuator solenoid (SRR) circuit

Brake actuator

SRRR or SRRH circuit

C0256/24

(

05–316

)

Open or short circuit in ABS actuator solenoid (SRL) circuit

Brake actuator

SRLR or SRLH circuit

C0273/13

(

05–318

)

Open circuit in ABS motor relay circuit

ABS motor relay

C0274/14

(

05–318

)

Short circuit in ABS motor relay circuit

ABS motor relay

ABS motor relay circuit

C0278/11

(

05–321

)

Open circuit in ABS solenoid relay circuit

ABS solenoid relay

C0279/12

(

05–321

)

Short circuit in ABS solenoid relay circuit

ABS solenoid relay

ABS solenoid relay circuit

C1235/35

(

05–308

)

Foreign matter is attached on the tip of right front sensor

Right front speed sensor

Right front speed sensor rotor

C1236/36

(

05–308

)

Foreign matter is attached on the tip of left front sensor

Left front speed sensor

Left front speed sensor rotor

C1238/38

(

05–312

)

Foreign matter is attached on the tip of right rear sensor

Right rear speed sensor

Right rear speed sensor rotor

C1239/39

(

05–312

)

Foreign matter is attached on the tip of left rear sensor

Left rear speed sensor

Left rear speed sensor rotor

C1241/41

(

05–324

)

Low battery voltage or abnormally high battery voltage

Battery

Charging system

Power source circuit

C1249/49

(

05–327

)

Open circuit in stop light switch circuit

Stop light switch

Stop light switch circuit

05–304

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

469

Author:

Date:

2004 COROLLA (RM1037U)

C1251/51

(

05–330

)

Pump motor is locked
Open circuit in pump motor circuit

ABS pump motor

Always ON

(

05–332

)

Malfunction in skid control ECU

Battery

Charging system

Power source circuit

Skid control ECU

DTC of speed sensor check function:

Code No.

Diagnosis

Trouble Area

C1271/71

Low output voltage of right front speed sensor

Right front speed sensor

Sensor installation

Sensor rotor

C1272/72

Low output voltage of left front speed sensor

Left front speed sensor

Sensor installation

Sensor rotor

C1273/73

Low output voltage of right rear speed sensor

Right rear speed sensor

Sensor installation

Sensor rotor

C1274/74

Low output voltage of left rear speed sensor

Left rear speed sensor

Sensor installation

Sensor rotor

C1275/75

Abnormal change in output voltage of right front speed sensor

Right front speed sensor rotor

C1276/76

Abnormal change in output voltage of left front speed sensor

Left front speed sensor rotor

C1277/77

Abnormal change in output voltage of right rear speed sensor

Right rear speed sensor rotor

C1278/78

Abnormal change in output voltage of left rear speed sensor

Left rear speed sensor rotor

057UB–04

F42872

Combination Meter
(ABS Warning Light)
(Brake Warning Light)

DLC3

Left Front Speed Sensor

Right Front Speed Sensor

Brake Actuator
(Incluied Skid Control ECU)

Skid Control Sensor

Speed Sensor Rotor

Instrument Panel
J/B and R/B

Parking Brake Switch

Brake Fluid Level
Warning Switch

Stop Lamp Switch

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

05–305

470

Author:

Date:

2004 COROLLA (RM1037U)

LOCATION

057UC–04

F07812

S1

05–306

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

471

Author:

Date:

2004 COROLLA (RM1037U)

TERMINALS OF ECU

Symbols (Terminal No.)

Wiring Color

Condition

STD Voltage (V)

+BS (2) – GND (1, 23)

R

⇔

W–B

Always

10 – 14

FL+ (13) – FL– (26)

R

⇔

G

IG switch ON, slowly turn left front wheel

AC generation

RL+ (7) – RL– (6)

B

⇔

Y

IG switch ON, slowly turn left rear wheel

AC generation

BRL (19) – GND (1, 23)

R

⇔

W–B

IG switch ON, brake warning light ON

8 – 14

D/G (11) – GND (1, 23)

L–R

⇔

W–B

IG switch ON

10 – 14

Ts (10) – GND (1,23)

GR

⇔

W–B

IG switch ON

10 – 14

Tc (8) – GND (1, 23)

P–B

⇔

W–B

IG switch ON

10 – 14

STP (16) – GND (1, 23)

G–W

⇔

W–B

Stop light switch ON

8 – 14

+BM (24) – GND (1, 23)

L

⇔

W–B

Always

10 – 14

IG1 (3) – GND (1, 23)

B–W

⇔

W–B

IG switch ON

10 – 14

WA (30) – GND (1, 23)

W–R

⇔

W–B

IG switch ON, ABS warning light ON

8 – 14

FR+ (27) – FR– (28)

B

⇔

W

IG switch ON, slowly turn right front wheel

AC generation

RR+ (5) – RR– (4)

R

⇔

W

IG switch ON, slowly turn right rear wheel

AC generation

SP1 (17) – GND (1, 23)

W–G

↔

W–B

Vehicle driving at about 20 km/h (12 mph)

AC generation

PKB (12)

GND (1 23)

R W

↔

W B

IG switch ON, parking brake switch ON

Below 1.5

PKB (12) – GND (1, 23)

R–W

↔

W–B

IG switch ON, parking brake switch OFF

10 – 14

057UD–04

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

05–307

472

Author:

Date:

2004 COROLLA (RM1037U)

PROBLEM SYMPTOMS TABLE

If a normal code is displayed during the DTC check but the problem still occurs, check the circuits for each
problem symptom in the order given in the table below and proceed to the relevant troubleshooting page.
NOTICE:
When replacing Skid Control ECU, sensor or etc., turn the ignition switch to OFF.

Symptom

Suspect Area

See page

ABS does not operate

When the followings 1. to

4. are all normal and the problem

is still occurring, replace the skid control ECU.
1. Check the DTC reconfirming that the normal code is

output.

2. IG power source circuit

3. Speed sensor circuit

4. Check the brake actuator with a hand–held tester.

If abnormal, check the hydraulic circuit for leakage.

05–297

05–324

05–308

05–312

32–40

ABS does not operate efficiently

When the following 1. to 4. are all normal and the problem
is still occurring, replace the skid control ECU.
1. Check the DTC reconfirming that the normal code is

output.

2. Speed sensor circuit

3. Stop light switch circuit

4. Check the brake actuator with a hand–held tester.

If abnormal, check the hydraulic circuit for leakage.

05–297

05–308

05–312

05–327

32–40

ABS warning light abnormality

1. ABS warning light circuit

2. Skid control ECU

05–332

05–335

–

DTC check cannot be done

When the following 1. and 2. are all normal and the problem
is still occurring, replace the skid control ECU.
1. ABS warning light circuit

2. Tc terminal circuit

05–332

05–335

05–341

Speed sensor signal check cannot be done

1. Ts terminal circuit

2. Skid control ECU

05–343

–

BR3583
BR3582

BR3583
BR3582

F00010

Rotor

+V

Speed Sensor

Magnet

Coil

N

S

To ECU

Low Speed

High Speed

–V

05–308

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

473

Author:

Date:

2004 COROLLA (RM1037U)

DTC

C0200/31 RIGHT FRONT SPEED SENSOR CIRCUIT

DTC

C0205/32 LEFT FRONT SPEED SENSOR CIRCUIT

DTC

C1235/35 FOREIGN MATTER IS ATTACHED ON TIP OF

RIGHT FRONT SENSOR

DTC

C1236/36 FOREIGN MATTER IS ATTACHED ON TIP OF

LEFT FRONT SENSOR

CIRCUIT DESCRIPTION

The speed sensor detects wheel speed and transmits the ap-
propriate signals to the ECU. These signals are used for control
of the ABS control system. Each of the front and rear rotors has
48 serrations.
When the rotors rotate, the magnetic field generated by the per-
manent magnet in the speed sensor induces an AC voltage.
Since the frequency of this AC voltage changes in direct propor-
tion to the speed of the rotor, the frequency is used by the ECU
to detect the speed of each wheel.

DTC No.

DTC Detecting Condition

Trouble Area

C0200/31
C0205/32

Detection of any of conditions 1. through 3.:
1. At vehicle speed of 10 km/h (6 mph) or more, pulses are

not input for 15 sec.

2. Momentary interruption of the speed sensor signal oc-

curs at least 7 times in the time between switching the

ignition switch ON and switching it OFF.

3. The condition that the speed sensor signal circuit is

open continues for 0.5 sec. or more.

Right front and left front speed sensor

Each speed sensor circuit

Speed sensor rotor

C1235/35
C1236/36

At the vehicle speed of 20 km/h (12 mph) or more, the
condition that noise is included in the speed sensor signal
continues for 5 sec. or more.

Right front and left front speed sensor

Speed sensor rotor

HINT:
DTC No. C0200/31 and C1235/35 is the right front speed sensor.
DTC No. C0205/32 and C1236/36 is the left front speed sensor.

057UE–04

F40884

2

1

B

W

27

28

FR+

FR–

S1

A3
ABS Speed Sensor
Front LH

2

1

26

S1

13

S1

S1

FL+

FL–

R

G

Skid Control ECU
with Actuator

A4
ABS Speed Sensor
Front RH

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

05–309

474

Author:

Date:

2004 COROLLA (RM1037U)

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:
Start the inspection from step 1 in case of using the hand–held tester and start from step 2 in case of not
using the hand–held tester.

1

READ VALUE OF HAND–HELD TESTER(FRONT SPEED SENSOR)

(a)

Select the DATALIST mode on the hand–held tester.

(b)

Check that there is no difference between the speed value output from the speed sensor displayed
by the hand–held tester and the speed value displayed by the speedometer when driving the vehicle.
OK:
There is almost no difference in the displayed speed value.

HINT:
There is tolerance of

10 % in the speedometer indication.

OK

Go to step 5

NG

C93876

2

1

W04200

Normal Signal Waveform

1 V / Division

2 m/s / Division

GND

05–310

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

475

Author:

Date:

2004 COROLLA (RM1037U)

2

INSPECT FRONT SPEED SENSOR

(a)

Remove the fender liner.

(b)

Disconnect the speed sensor connector.

(c)

Measure resistance between terminals 1 and 2 of the
speed sensor connector.
OK: 0.6 – 2.5 k

Ω

or 0.9 – 1.8 k

Ω

at 20

C

(d)

Measure resistance between each of terminals 1 and 2 of
speed sensor connector and body ground.
OK:
Resistance: 1 M

Ω

or higher

NG

REPLACE SPEED SENSOR FRONT RH

NG

REPLACE SPEED SENSOR FRONT LH

NOTICE:
Check the speed sensor signal last (See page

05–297

).

OK

3

CHECK HARNESS AND CONNECTOR(FRONT SPEED SENSOR – SKID CONTROL
ECU)

(a)

Check for open and short circuit in harness and connector between each front speed sensor and skid
control ECU (See page

01–30

).

NG

REPAIR OR REPLACE HARNESS OR
CONNECTOR

OK

4

INSPECT SPEED SENSOR AND SENSOR ROTOR SERRATIONS

(REFERENCE) INSPECTION USING OSCILLOSCOPE
(a)

Connect the oscilloscope to the terminal FR+ – FR– and
FL+ – FL– of the skid control ECU.

(b)

Drive the vehicle at about 30 km/h (19 mph), and check
the signal waveform.

HINT:

As the vehicle speed (wheel revolution speed) increases,
a cycle of the waveform becomes shorter and the fluctua-
tion in the output voltage becomes greater.

When noise is identified in the waveform on the oscillo-
scope, error signals are generated due to the speed sen-
sor rotor’s scratches, looseness or foreign matter depos-
ited on it.

OK

CHECK AND REPLACE BRAKE ACTUATOR
ASSY

NG

BR3795

OK

NG

BR3719

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

05–311

476

Author:

Date:

2004 COROLLA (RM1037U)

5

INSPECT FRONT SPEED SENSOR INSTALLATION

(a)

Check the speed sensor installation.
OK:
The installation bolt is tightened properly and there is
no clearance between the sensor and front steering
knuckle.
Torque: 8.0 N

⋅

m (82 kgf

⋅

cm, 71 in.

⋅

lbf)

NG

REPLACE SPEED SENSOR FRONT RH

NG

REPLACE SPEED SENSOR FRONT LH

NOTICE:
Check the speed sensor signal last (See page

05–297

).

OK

6

INSPECT SPEED SENSOR TIP

(a)

Remove the front speed sensor (See page

32–44

).

(b)

Check the sensor tip.
OK:
No scratches or foreign objects on the sensor tip.

NG

CLEAN OR REPAIR SPEED SENSOR

NOTICE:
Check the speed sensor signal last (See page

05–297

).

OK

7

INSPECT SPEED SENSOR ROTOR

(a)

Remove the front speed sensor rotor (See page

30–6

).

(b)

Check the sensor rotor serrations.
OK:
No scratches, missing teeth or foreign objects.

HINT:
If foreign matter is attached, remove it and after reassembling,
check the output waveform.

NG

CLEAN OR REPAIR SPEED SENSOR ROTOR

NOTICE:
Check the speed sensor signal last (See page

05–297

).

OK

CHECK AND REPLACE BRAKE ACTUATOR ASSY (See page

05–306

)

F44146

A19
ABS Speed Sensor
Rear LH

A20
ABS Speed Sensor
Rear RH

Skid Control ECU
with Actuator

W

B

W

B

Y

B

W

R

Y

B

W

R

2

1

2

1

2

1

4

3

6

7

4

5

BC1

IB1

IB1

IB1

IB1

S1

S1

S1

S1

RL–

RL+

RR–

RR+

1

2

1

2

BC1

BC1

BC1

05–312

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

477

Author:

Date:

2004 COROLLA (RM1037U)

DTC

C0210/33 RIGHT REAR SPEED SENSOR CIRCUIT

DTC

C0215/34 LEFT REAR SPEED SENSOR CIRCUIT

DTC

C1238/38 FOREIGN MATTER IS ATTACHED ON TIP OF

RIGHT REAR SENSOR

DTC

C1239/39 FOREIGN MATTER IS ATTACHED ON TIP OF

LEFT REAR SENSOR

CIRCUIT DESCRIPTION

Refer to DTC C0200/31, C0205/32, C1235/35, C1236/36 on page

05–308

.

DTC No.

DTC Detecting Condition

Trouble Area

C0210/33

C0215/34

Detection of any of conditions 1. through 3.:

1. At vehicle speed of 10 km/h (6 mph) or more, pulses are

not input for 15 sec.

2. Momentary interruption of the speed sensor signal oc-

curs at least 7 times in the time between switching the

ignition switch ON and switching it OFF.

3. The condition that the speed sensor signal circuit is

open continues for 0.5 sec. or more.

Right rear and left rear speed sensor

Each speed sensor circuit

Speed sensor rotor

C1238/38

C1239/39

At the vehicle speed of 20 km/h (12 mph) or more, the
condition that noise is included in the speed sensor signal
continues for 5 sec. or more.

Right rear and left rear speed sensor

Speed sensor rotor

HINT:
DTC No. C0210/33, C1238/38 is for the right rear speed sensor.
DTC No. C0215/34, C1239/39 is for the left rear speed sensor.

WIRING DIAGRAM

057UF–05

F41836

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

05–313

478

Author:

Date:

2004 COROLLA (RM1037U)

INSPECTION PROCEDURE

HINT:
Start the inspection from step 1 in case of using the hand–held tester and start from step 2 in case of not
using the hand–held tester.

1

READ VALUE OF HAND–HELD TESTER(SKID CONTROL SENSOR)

(a)

Check that there is no difference between the speed value output from the speed sensor displayed
by the hand–held tester and the speed value displayed by the speedometer when driving the vehicle.
OK:
There is almost no difference in the displayed speed value.

HINT:
There is tolerance of

±

10 % in the speedometer indication.

OK

Go to step 5

NG

2

INSPECT SKID CONTROL SENSOR

(a)

Disconnect the skid control sensor connector.

(b)

Measure resistance between terminals 1 and 2 of the skid
control sensor connector.
OK:
Resistance: 2.2 k

Ω

or less

(c)

Measure resistance between each of terminals 1 and 2 of
skid control sensor connector and body ground.
OK:
Resistance: 1 M

Ω

or higher

NG

REPLACE SKID CONTROL SENSOR

NOTICE:
Check the speed sensor signal last (See page

05–297

).

OK

3

CHECK HARNESS AND CONNECTOR(SKID CONTROL SENSOR – SKID
CONTROL ECU)

(a)

Check for open and short circuit in harness and connector between each skid control sensor and skid
control ECU (See page

01–30

).

NG

REPAIR OR REPLACE HARNESS OR
CONNECTOR

OK

W04200

Normal Signal Waveform

1 V / Division

2 m/s / Division

GND

F10178

OK

NG

05–314

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

479

Author:

Date:

2004 COROLLA (RM1037U)

4

INSPECT SENSOR AND SENSOR ROTOR SERRATIONS

(REFERENCE) INSPECTION USING OSCILLOSCOPE
(a)

Connect the oscilloscope to the terminals RR+ – RR– and
RL+ – RL– of the skid control ECU.

(b)

Drive the vehicle at about 30 km/h (19 mph), and check
the signal waveform.

HINT:

As the vehicle speed (wheel revolution speed) increases,
a cycle of the waveform becomes shorter and the fluctua-
tion in the output voltage becomes greater.

When noise is identified in the waveform on the oscillo-
scope, error signals are generated due to the speed sen-
sor rotor’s scratches, looseness or foreign matter depos-
ited on it.

OK

CHECK AND REPLACE BRAKE ACTUATOR
ASSY

NG

5

INSPECT SENSOR INSTALLATION

(a)

Check the sensor installation.
OK:
There is no clearance between the sensor and rear
axle carrier.

NG

REPLACE SKID CONTROL SENSOR

NOTICE:
Check the speed sensor signal last (See page

05–297

).

OK

6

INSPECT SKID CONTROL SENSOR TIP

(a)

Remove the skid control sensor (See page

32–46

).

(b)

Check the sensor tip.
OK:
No scratches or foreign objects on the sensor tip.

NG

CLEAN OR REPAIR SKID CONTORL SENSOR

NOTICE:
Check the speed sensor signal last (See page

05–297

).

OK

W04846

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

05–315

480

Author:

Date:

2004 COROLLA (RM1037U)

7

INSPECT SENSOR ROTOR

(a)

Check the sensor rotor serrations.
OK:
No scratches, missing teeth or foreign objects.

NG

REPLACE REAR AXLE HUB & BEARING ASSY
RH

NG

REPLACE REAR AXLE HUB & BEARING ASSY
LH

NOTICE:
Check the speed sensor signal last (See page

05–297

).

OK

CHECK AND REPLACE BRAKE ACTUATOR ASSY (See page

05–306

)

NOTICE:
Do not reuse skid control sensor.

C96169

Battery

FL MAIN

Skid Control ECU with Actuator

B

R

1

ALT

ABS No.1

Engine Room R/B and J/B

1

1A

W–B

S1

S1

1

2

+BS

1

2 1

2

GND2

GND1

S1

23

W–B

W–B

EA

05–316

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

481

Author:

Date:

2004 COROLLA (RM1037U)

DTC

C0226/21 SFR SOLENOID CIRCUIT

DTC

C0236/22 SFL SOLENOID CIRCUIT

DTC

C0246/23 SRR SOLENOID CIRCUIT

DTC

C0256/24 SRL SOLENOID CIRCUIT

CIRCUIT DESCRIPTION

This solenoid goes on when signals are received from the ECU and controls the pressure acting on the wheel
cylinders thus controlling the braking force.

DTC No.

DTC Detecting Condition

Trouble Area

C0226/21

C0236/22

C0246/23

C0256/24

Detection of any condition in 1. and 2.:

1. With IG1 terminal voltage at 10V – 16V, solenoid circuit

is open or short circuit for 0.05 sec. or longer.

2. With IG1 terminal voltage at 10V – 16V, during ABS con-

trol solenoid relay contact is OFF for 0.05 sec. or longer.

Each solenoid circuit

Brake actuator

WIRING DIAGRAM

057UG–04

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

05–317

482

Author:

Date:

2004 COROLLA (RM1037U)

INSPECTION PROCEDURE

1

RECONFIRM DTC

(a)

Check if the other DTCs are recorded (See page

05–297

).

YES

REPAIR CIRCUIT INDICATED BY OUTPUT
CODE

NO

REPLACE BRAKE ACTUATOR ASSY

C96169

Battery

FL MAIN

Skid Control ECU with Actuator

B

L

1

ALT

ABS No.2

Engine Room R/B and J/B

1

1A

W–B

S1

S1

1

24

+BM

1

2 1

2

GND2

GND1

S1

23

W–B

W–B

EA

05–318

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

483

Author:

Date:

2004 COROLLA (RM1037U)

DTC

C0273/13 OPEN CIRCUIT IN ABS MOTOR RELAY

CIRCUIT

DTC

C0274/14 B+ SHORT CIRCUIT IN ABS MOTOR RELAY

CIRCUIT

CIRCUIT DESCRIPTION

The ABS motor relay supplies power to the ABS pump motor. While the ABS is activated, the ECU switches
the motor relay ON and operates the ABS pump motor.

DTC No.

DTC Detecting Condition

Trouble Area

C0273/13

With IG1 voltage 10V or below during initial check or ABS
control, pump motor relay is turned ON, and relay contact is
not ON for 0.2 sec. or longer.

ABS motor relay
ABS

t

l

i

it

C0274/14

When pump motor relay is turned OFF, relay contact is ON
for 3 sec. or longer.

ABS motor relay circuit

WIRING DIAGRAM

057UH–02

C58919

+BM (+)

(–)

GND1

GND2

(–)

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

05–319

484

Author:

Date:

2004 COROLLA (RM1037U)

INSPECTION PROCEDURE

HINT:
Start the inspection from step 1 in case of using the hand–held tester and start from step 2 in case of not
using the hand–held tester.

1

PERFORM ACTIVE TEST BY HAND–HELD TESTER(ABS MOTOR RELAY)

(a)

Check the operation sound of the ABS motor individually when operaing it with the hand–held tester.
OK:
The operation sound of the ABS motor should be heard.

OK

CHECK AND REPLACE BRAKE ACTUATOR
ASSY

NG

2

INSPECT SKID CONTROL ECU CONNECTOR(+BM TERMINAL VOLTAGE)

(a)

Disconnect the skid control ECU connector.

(b)

Measure the voltage between terminals +BM (24) and
GND (1, 23) of skid control ECU harness side connector.
Voltage: 10 – 14 V

OK

CHECK AND REPLACE BRAKE ACTUATOR
ASSY

NG

I32647

ABS No.2

Engine Room R/B

C58919

GND1

GND2

05–320

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

485

Author:

Date:

2004 COROLLA (RM1037U)

3

INSPECT FUSE(ABS No.2 FUSE)

(a)

Remove ABS No.2 fuse from the engine room R/B.

(b)

Check continuity of ABS No.2 fuse.
OK:
Continuity

NG

REPLACE INSPECT FOR SHORT CIRCUIT IN
ALL HARNESS AND COMPONENTS
CONNECTED TO ABS NO. 2 FUSE

OK

4

INSPECT SKID CONTROL ECU CONNECTOR(GND TERMINAL CONTINUITY)

(a)

Measure resistance between terminal GND (1,23) of skid
control ECU harness side connector and body ground.
Resistance: 1

Ω

or less

NG

CHECK AND REPAIR HARNESS AND
CONNECTOR

OK

CHECK AND REPLACE BRAKE ACTUATOR ASSY (See page

05–306

)

C96169

Battery

FL MAIN

Skid Control ECU with Actuator

B

R

1

ALT

ABS No.1

Engine Room R/B and J/B

1

1A

W–B

S1

S1

1

2

+BS

1

2 1

2

GND2

GND1

S1

23

W–B

W–B

EA

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

05–321

486

Author:

Date:

2004 COROLLA (RM1037U)

DTC

C0278/11 OPEN CIRCUIT IN ABS SOLENOID RELAY

CIRCUIT

DTC

C0279/12 SHORT CIRCUIT IN ABS SOLENOID RELAY

CIRCUIT

CIRCUIT DESCRIPTION

This relay supplies power to each ABS solenoid. After the ignition switch is turned ON, if the initial check is
OK, the relay goes on.

DTC No.

DTC Detecting Condition

Trouble Area

C0278/11

When solenoid relay is turned ON, relay contact is OFF for
0.2 sec. or longer.

ABS solenoid relay

C0279/12

Immediately after IG1 is turned ON, when solenoid relay is

turned OFF, relay contact is ON for 0.2 sec. or longer.

ABS solenoid relay

ABS solenoid relay circuit

WIRING DIAGRAM

057UI–04

C58919

+BS (+)

(–)

GND1

GND2(–)

05–322

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

487

Author:

Date:

2004 COROLLA (RM1037U)

INSPECTION PROCEDURE

1

INSPECT SKID CONTROL ECU CONNECTOR(+BS TERMINAL VOLTAGE)

(a)

Disconnect the skid control ECU connector.

(b)

Measure the voltage between terminals +BS (2) and GND
(1, 23) of skid control ECU harness side connector.
Voltage: 10 – 14 V

NG

REPAIR OR REPLACE HARNESS AND
CONNECTOR (+BM CIRCUIT)

OK

2

RECONFIRM DTC

(a)

Check the DTC (See page

05–297

).

OK :
Normal code

NG

END

OK

I32647

ABS No.1

Engine Room R/B

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

05–323

488

Author:

Date:

2004 COROLLA (RM1037U)

3

INSPECT CONTACT CONDITION

(a)

Inspect the condition of the each connector from engine
room R/B to skid control ECU.

NG

REPAIR OR REPLACE HARNESS AND
CONNECTOR

OK

CHECK AND REPLACE BRAKE ACTUATOR ASSY (See page

05–306

)

F42888

Battery

FL MAIN

A

J6
J/C

ECU–IG

1

I10

2

1

IG1

13

4

1

IC

IF

IB

2

3

1

1D

1

1A

ALT

W

Skid Control ECU
with Actuator

S1

Instrument Panel J/B

IG1 Relay

AM1

IG1

W

W–B

W–B

W–B

B

1C

B–Y

3

1

S1

1

S1

23

GND1

GND2

IE

EA

5

1

2

AM1

Engine Room J/B

Ignition SW

W

W–B

B–W

1

2

12

IA

IF

IF

W

05–324

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

489

Author:

Date:

2004 COROLLA (RM1037U)

DTC

C1241/41 LOW BATTERY POSITIVE VOLTAGE OR

ABNORMALLY HIGH BATTERY POSITIVE
VOLTAGE

CIRCUIT DESCRIPTION

This is the power source of the ECU, hence the actuators.

DTC No.

DTC Detecting Condition

Trouble Area

C1241/41

Detection of any of conditions 1. through 3. :

1. With vehicle speed at 3 km/h or more, IG1 terminal volt-

age is 10V or below for 10 sec. or longer.

2. With IG1 terminal voltage at 10V or below, solenoid relay

open, pump motor relay open, solenoid fault detecting

condition are established

3. Voltage of ECU terminal IG1 remains at more than 17V

continues for 1.2 sec. or more.

Battery

Charging system

Power source circuit

WIRING DIAGRAM

057UJ–04

I32648

ECU–IG

Instrument Panelk J/B

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

05–325

490

Author:

Date:

2004 COROLLA (RM1037U)

INSPECTION PROCEDURE

1

INSPECT FUSE(ECU–IG FUSE)

(a)

Remove ECU–IG fuse from the instrument panel J/B.

(b)

Check continuity of ECU–IG fuse.
OK:
Continuity

NG

INSPECT FOR SHORT CIRCUIT IN ALL
HARNESS AND COMPONENTS CONNECTED
TO ECU–IG FUSE

OK

2

INSPECT BATTERY

OK:
Voltage: 10 – 14 V

NG

INSPECT CHARGING SYSTEM

OK

C58919

IG1 (+)

(–)

GND1

GND2(–)

C58919

GND1

GND2

05–326

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

491

Author:

Date:

2004 COROLLA (RM1037U)

3

INSPECT SKID CONTROL ECU CONNECTOR(IG1 TERMINAL VOLTAGE)

IN CASE OF USING HAND–HELD TESTER:
(a)

Check the voltage condition output from the ECU displayed on the hand–held tester.
OK:
”Normal” is displayed.

IN CASE OF NOT USING HAND–HELD TESTER:
(a)

Disconnect the skid control ECU connector.

(b)

Turn the ignition switch to ON.

(c)

Measure voltage between terminals IG1 (3) and GND (1,
23) of skid control ECU harness side connector.
OK:
oltage: 10 – 14 V

OK

CHECK AND REPLACE BRAKE ACTUATOR
ASSY

NG

4

INSPECT SKID CONTROL ECU CONNECTOR(GND TERMINAL CONTINUITY)

(a)

Measure resistance between terminal GND (1, 23) of skid
control ECU harness side connector and body ground.
OK:
Resistance: 1

Ω

or less

NG

REPAIR OR REPLACE HARNESS OR
CONNECTOR

OK

CHECK AND REPLACE BRAKE ACTUATOR ASSY (See page

05–306

)

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

05–327

492

Author:

Date:

2004 COROLLA (RM1037U)

DTC

C1249/49 OPEN CIRCUIT IN STOP LIGHT SWITCH

CIRCUIT

CIRCUIT DESCRIPTION

DTC No.

DTC Detecting Condition

Trouble Area

C1249/49

With IG1 terminal voltage at 10V – 16V, ABS not controlling

stop light switch circuit is open for 1.0 sec. or longer.

Stop light switch

Stop light switch circuit

057UK–04

F42889

Skid Control ECU
with Actuator

STP

S1

16

G–W

Engine Room J/B

Instrument Panel J/B

2

R–W

STOP

G–W

IB

IC

W

1

G–W

H9
High Mounted Stop Light

1

2

G–W

G–W

2

4

R11
Rear Combination Light RH

W–B

W–B (*1)

W–B

G–W

C

J9

4

G–W

J/C

1C

ALT

1A

Stop

W–B

2

BH

J8
J/C

B

W

Stop

FL MAIN

Battery

*1: LED Type
*2: Bulb Type

1

1

1

2

1

14

7

5

IC

ID

S9
Stop Control SW

(*1)

G–W

J9

J8

J8

BI

H9
High Mounted Stop Light

W–B (*2)

G–W (*2)

C

B

B

R9
Rear Combination Light LH

1

2

W–B

A

A

A

05–328

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

493

Author:

Date:

2004 COROLLA (RM1037U)

WIRING DIAGRAM

C58919

STP (+)

(–)

GND1

GND2(–)

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

05–329

494

Author:

Date:

2004 COROLLA (RM1037U)

INSPECTION PROCEDURE

1

INSPECT STOP LAMP SWITCH ASSY

(a)

Check that the stop light lights up when brake pedal is depressed and turns OFF when the brake pedal
is released.

NG

Go to step 4

OK

2

INSPECT SKID CONTROL ECU TERMINAL VOLTAGE(STP TERMINAL)

(a)

Disconnect skid control ECU connector.

(b)

Measure voltage between terminal STP (16) and GND (1,
23) of skid control ECU harness side connector when the
brake pedal is depressed.
Voltage: 10 – 14 V

OK

CHECK AND REPLACE BRAKE ACTUATOR
ASSY

NG

3

CHECK HARNESS AND CONNECTOR(STOP LIGHT SWITCH – SKID CONTROL
ECU)

(a)

Check for open and short circuit in harness and connector between stop light switch and skid control
ECU (See page

01–30

).

NG

REPAIR OR REPLACE HARNESS OR
CONNECTOR

OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE

4

CHECK HARNESS AND CONNECTOR(STOP LIGHT CIRCUIT)

(a)

Check for open and short circuit in harness and connector of the stop light circuit (See page

01–30

).

OK

REPLACE STOP LAMP SWITCH ASSY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

C96169

Battery

FL MAIN

Skid Control ECU with Actuator

B

L

1

ALT

ABS No.2

Engine Room R/B and J/B

1

1A

W–B

S1

S1

1

24

+BM

1

2 1

2

GND2

GND1

S1

23

W–B

W–B

EA

05–330

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

495

Author:

Date:

2004 COROLLA (RM1037U)

DTC

C1251/51 PUMP MOTOR IS LOCKED/OPEN CIRCUIT

IN PUMP MOTOR GROUND

CIRCUIT DESCRIPTION

DTC No.

DTC Detecting Condition

Trouble Area

C1251/51

ABS actuator pump motor is not operating normally during

initial check.

ABS pump motor

WIRING DIAGRAM

057UL–04

C58919

GND2 (–) +BM (+)

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

05–331

496

Author:

Date:

2004 COROLLA (RM1037U)

INSPECTION PROCEDURE

HINT:
Start the inspection from step 1 in case of using the hand–held tester and start from step 2 in case of not
using hand–held tester.

1

INSPECT BRAKE ACTUATOR ASSY

(a)

Select the DATALIST mode on the hand–held tester.

(b)

Check the operation sound of the ABS pump motor when operating it with the hand–held tester.
OK:
The operation sound of the ABS pump motor should be heard.

OK

PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN ON PROBLEM SYMPTOMS TABLE

NG

2

INSPECT SKID CONTROL ECU TERMINAL VOLTAGE(+BM TERMINAL VOLTAGE)

(a)

Disconnect the skid control ECU connector.

(b)

Measure the voltage between terminal +BM (24) and
GND (23) of skid control ECU harness side connector.
OK:
The operation sound of the ABS pump motor should
be heard.

NG

REPAIR OR REPLACE HARNESS OR
CONNECTOR

OK

REPLACE BRAKE ACTUATOR ASSY

F42888

Battery

FL MAIN

A

J6
J/C

ECU–IG

1

I10

2

1

IG1

13

4

1

IC

IF

IB

2

3

1

1D

1

1A

ALT

W

Skid Control ECU
with Actuator

S1

Instrument Panel J/B

IG1 Relay

AM1

IG1

W

W–B

W–B

W–B

B

1C

B–Y

3

1

S1

1

S1

23

GND1

GND2

IE

EA

5

1

2

AM1

Engine Room J/B

Ignition SW

W

W–B

B–W

1

2

12

IA

IF

IF

W

05–332

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

497

Author:

Date:

2004 COROLLA (RM1037U)

DTC

AlwaysON MALFUNCTION IN ABS ECU

CIRCUIT DESCRIPTION

DTC No.

DTC Detecting Condition

Trouble Area

Always ON

Either of the following 1. or 2. is detected:
1. The ECU connectors are OFF from the ECU.

2. There is a malfunction in the ECU internal circuit.

Battery

Charging system

Power source circuit

Skid control ECU

HINT:
There is a case that hand–held tester cannot be used when ECU is abnormal.

WIRING DIAGRAM

057UM–04

C58919

IG1 (+)

(–)

GND1

GND2(–)

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

05–333

498

Author:

Date:

2004 COROLLA (RM1037U)

INSPECTION PROCEDURE

1

RECONFIRM DTC

(a)

Check the DTC (See page

05–297

).

YES

REPAIR CIRCUIT INDICATED BY OUTPUT
CODE

NO

2

INSPECT SKID CONTROL ECU CONNECTOR SECURELY CONNECTED

NO

CONNECT CONNECTOR TO ECU

YES

3

INSPECT SKID CONTROL ECU CONNECTOR(IG1 TERMINAL VOLTAGE)

IN CASE OF USING HAND–HELD TESTER:
(a)

Check the voltage condition output from the ECU displayed on the hand–held tester.
OK:
”Normal” is displayed.

IN CASE OF NOT USING HAND–HELD TESTER:
(a)

Disconnect the skid control ECU connector.

(b)

Turn the ignition switch to ON.

(c)

Measure voltage between terminals IG1 (3) and GND (1,
23) of skid control ECU harness side connector.
OK:
oltage: 10 – 14 V

OK

Go to step 5

NG

C58919

GND1

GND2

C58919

WA

GND2

GND1

05–334

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

499

Author:

Date:

2004 COROLLA (RM1037U)

4

INSPECT SKID CONTROL ECU CONNECTOR(GND TERMINAL CONTINUITY)

(a)

Measure resistance between terminal GND (S1–2, 24) of
skid control ECU harness side connector and body
ground.
Resistance: 1

Ω

or less

NG

REPAIR OR REPLACE HARNESS OR
CONNECTOR

OK

CHECK AND REPAIR HARNESS AND CONNECTOR

5

GO TO COMBINATION METER SYSTEM(ABS WARNING LIGHT)

(a)

Disconnect the skid control ECU connector.

(b)

Using service wire, connect terminals WA (30) and GND
(1, 23) of skid control ECU harness side connector.

(c)

Turn the ignition switch to ON.
OK:
ABS warning light goes off.

NG

REPAIR OR REPLACE COMBINATION METER
ASSEMBLY

OK

CHECK AND REPLACE BRAKE ACTUATOR ASSY(See page

05–306

)

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

05–335

500

Author:

Date:

2004 COROLLA (RM1037U)

ABS WARNING LIGHT CIRCUIT (DOES NOT LIGHT UP)

CIRCUIT DESCRIPTION

If the ECU detect trouble, it will prohibit ABS control, turn on ABS warning light, and store the DTC.
Connect terminals Tc and CG of the DLC3 to make the ABS warning light blink and output the DTC.

057UN–04

F42890

Skid Control ECU
with Actuator

WA

30

W–R

W–B

J6
J/C

18

37

S1

4

Instrument Panel J/B

2

IG

IF

GAUGE

IG1 Relay

5

2

1

4

IF

12

1

IA

RH J/B

W

2

B–Y

I10 Ignition SW

AM1

IG1

1

2

W

Engine Room J/B

W

FL MAIN

Battery

W

A

A

IE

B

1

1D

1

1C

1

1A

1

2

1

2

3

IF

IB

ALT

W

W–B

AM1

R–W

3B

22

3B

16

Center J/B

ABS

21

4B

4B

W–R

5

IA6

W–B

C9
Combination Meter

R–W

W

05–336

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

501

Author:

Date:

2004 COROLLA (RM1037U)

WIRING DIAGRAM

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

05–337

502

Author:

Date:

2004 COROLLA (RM1037U)

INSPECTION PROCEDURE

HINT:
Start the inspection from step 1 in case of using the hand–held tester and start from step 2 in case of not
using the hand–held tester.

1

PERFORM ACTIVE TEST BY HAND–HELD TESTER(ABS WARNING LIGHT)

(a)

Check that ”ON” and ”OFF” of the ABS warning light can be shown on the combination meter by the
hand–held tester.

OK

CHECK AND REPLACE BRAKE ACTUATOR
ASSY (See page

05–306

)

NG

2

INSPECT COMBINATION METER ASSY(ABS WARNING LIGHT)

(a)

Disconnect the connector from the skid control ECU.

(b)

Turn the ignition switch to ON.

(c)

Check the ABS warning light.
OK:
ABS warning light goes ON

NG

REPAIR OR REPLACE COMBINATION METER
ASSY

OK

3

CHECK HARNESS AND CONNECTOR(WA CIRCUIT)

(a)

Check for short circuit in harness and connector of the between terminal WA of skid control ECU and
combination meter (See page

01–30

).

NG

REPAIR OR REPLACE HARNESS OR
CONNECTOR

OK

CHECK AND REPLACE BRAKE ACTUATOR ASSY (See page

05–306

)

05–338

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

503

Author:

Date:

2004 COROLLA (RM1037U)

BRAKE WARNING LIGHT CIRCUIT

CIRCUIT DESCRIPTION

If the ECU detects trouble, it lights the brake warning light at the same time of prohibiting ABS control. At
this time, the ECU records a DTC in memory.
Connect terminals Tc and CG of the DLC3 to make the brake warning light blink and output the DTC.

057UO–04

F42890

Skid Control ECU
with Actuator

WA

30

W–R

W–B

J6
J/C

18

37

S1

4

Instrument Panel J/B

2

IG

IF

GAUGE

IG1 Relay

5

2

1

4

IF

12

1

IA

RH J/B

W

2

B–Y

I10 Ignition SW

AM1

IG1

1

2

W

Engine Room J/B

W

FL MAIN

Battery

W

A

A

IE

B

1

1D

1

1C

1

1A

1

2

1

2

3

IF

IB

ALT

W

W–B

AM1

R–W

3B

22

3B

16

Center J/B

ABS

21

4B

4B

W–R

5

IA6

W–B

C9
Combination Meter

R–W

W

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

05–339

504

Author:

Date:

2004 COROLLA (RM1037U)

WIRING DIAGRAM

05–340

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

505

Author:

Date:

2004 COROLLA (RM1037U)

INSPECTION PROCEDURE

1

INSPECT PARKING BRAKE SWITCH CIRCUIT

(a)

Check for open and short circuit in parking brake switch circuit (See page

01–30

).

NG

REPAIR OR REPLACE PARKING BRAKE
SWITCH CIRCUIT

OK

2

INSPECT BRAKE FLUID LEVEL WARNING SWITCH CIRCUIT

(a)

Check the brake fluid level in reservoir.

(b)

Check for open and shot circuit in brake fluid level warning switch circuit (See page

01–30

).

NG

REPAIR OR REPLACE BRAKE FLUID LEVEL
WARNING SWITCH CIRCUIT

OK

3

CHECK DTC ONCE MORE

(a)

Check for open and short circuit in harness and connector between vacuum warning switch and skid
control ECU (See page

05–297

).

NG

REPAIR CIRCUIT INDICATED BY OUTPUT
CODE

OK

4

INSPECT COMBINATION METER ASSEMBLY(BRAKE WARNING LIGHT CIRCUIT)

(a)

Check for open and short circuit in combination meter (See page

01–30

).

NG

REPAIR OR REPLACE COMBINATION METER
ASSEMBLY

OK

5

CHECK HARNESS AND CONNECTOR(BRAKE ACTUATOR – COMBINATION
METER)

(a)

Check for open and short circuit in harness and connector between brake actuator and combination
meter (See page

01–30

).

NG

REPAIR OR REPLACE HARNESS OR
CONNECTOR

OK

CHECK AND REPLACE BRAKE ACTUATOR ASSY

F44147

Skid Control ECU
with Actuator

TC

8

S1

P–B

W–B

A

IE

4C

1

3

Center J/B

4C

J6
J/C

P–B

13

4

W–B

TC

CG

D1
DLC3

16

4B

21

4B

IA6

12

P–B

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

05–341

506

Author:

Date:

2004 COROLLA (RM1037U)

TC TERMINAL CIRCUIT

CIRCUIT DESCRIPTION

Connecting terminals Tc and CG of the DLC3 causes the ECU to display the DTC by flashing the ABS warn-
ing light.

WIRING DIAGRAM

057UP–04

C52361

Tc

CG

DLC3

05–342

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

507

Author:

Date:

2004 COROLLA (RM1037U)

INSPECTION PROCEDURE

1

INSPECT DLC3 TERMINAL VOLTAGE(Tc TERMINAL)

(a)

Turn the ignition switch to ON.

(b)

Measure voltage between terminals Tc and CG of DLC3.
OK:
Voltage: 10 – 14 V

OK

Go to step 3

NG

2

CHECK HARNESS AND CONNECTOR(DLC3 – BODY GROUND)

(a)

Check for open and short circuit in harness and connector between terminal CG of the DLC3 and body
ground (See page

01–30

).

NG

REPAIR OR REPLACE HARNESS OR
CONNECTOR

OK

3

CHECK HARNESS AND CONNECTOR(SKID CONTROL ECU – DLC3)

(a)

Check for open and short circuit in harness and connector between terminal Tc of the skid control ECU
and DLC3 (See page

01–30

).

NG

REPAIR OR REPLACE HARNESS OR
CONNECTOR

OK

CHECK AND REPLACE BRAKE ACTUATOR ASSY (See page

05–306

)

F42891

Skid Control ECU
with Actuator

TS

10
S1

W–B

4B

A

J6
J/C

IE

16

Center J/B

4B

21

12

4

TS

CG

D1 DLC3

GR

IA6

11

W–B

GR

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

05–343

508

Author:

Date:

2004 COROLLA (RM1037U)

Ts Terminal Circuit

CIRCUIT DESCRIPTION

The sensor check circuit detects abnormalities in the speed sensor signal which cannot be detected with
the DTC check.
Connecting terminals Ts and CG of the DLC3 starts the check.

WIRING DIAGRAM

057UQ–03

C52361

Ts

CG

DLC3

05–344

–

DIAGNOSTICS

ABS WITH EBD SYSTEM (April, 2003)

509

Author:

Date:

2004 COROLLA (RM1037U)

INSPECTION PROCEDURE

1

INSPECT DLC3 TERMINAL VOLTAGE(Ts TERMINAL)

(a)

Turn the ignition switch to ON.

(b)

Measure voltage between terminals Ts and CG of DLC3.
OK:
Voltage: 10 – 14 V

OK

Go to step 3

NG

2

CHECK HARNESS AND CONNECTOR(DLC3 – BODY GROUND)

(a)

Check for open and short circuit in harness and connector between terminal CG of the DLC3 and body
ground (See page

01–30

).

NG

REPAIR OR REPLACE HARNESS OR
CONNECTOR

OK

3

CHECK HARNESS AND CONNECTOR(SKID CONTROL ECU – DLC3)

(a)

Check for open and short circuit in harness and connector between terminal Ts of the DLC3 and skid
control ECU (See page

01–30

).

NG

REPAIR OR REPLACE HARNESS OR
CONNECTOR

OK

CHECK AND REPLACE BRAKE ACTUATOR ASSY (See page

05–306

)