10 1
ENGINE CONTROL SYSTEM  SFI SYSTEM
SFI SYSTEM
1008D 01
ON VEHICLE INSPECTION
1. INSPECTION THROTTLE BODY IDLE SPEED
Open
CONTROL VALVE ASSY
NOTICE:
Close S It is impossible to check the resister value and the op-
eration of ISC valve by itself, because the ISC valve
has an IC circuit inside it, which transforms the duty
Valve
signal from the ECM to the derive signal.
S After checking, erase the DTC.
S Clear the DTC after inspection.
HINT:
When the ISC valve system has malfunctions except for its ad-
herence, DTC P0505 is detected.
(a) Operation inspection.
(1) Connect the ISC connector to the ISC valve.
Valve
(2) Check the ISC valve movement when the ignition
switch is turned ON.
Movement:
Half open fully close fully open half open
HINT:
A50374
ISC valve moves within 0.5 second.
2004 COROLLA (RM1037U)
Author : Date : 955
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ENGINE CONTROL SYSTEM  SFI SYSTEM
1008E 02
INSPECTION
1. INTAKE AIR FLOW METER SUB ASSY
E2 THA
Ohmmeter
(a) Inspect the intake air flow meter resistance.
(1) Using an ohmmeter, measure the resistance be-
tween terminals THA and E2.
Resistance:
At  20_C ( 4_F) 13.6 to 18.4 k&!
At 20_C (68_F) 2.21 to 2.69 k&!
At 60_C (140_F) 0.49 to 0.67 k&!
HINT:
A65170
If the resistance is not as specified, replace the intake air flow
meter.
(b) Inspect the intake air flow meter operation.
VG E2G
(1) Connect the intake air flow meter connector.
(2) Turn the ignition switch to ON.
(3) Using a voltmeter, connect the positive (+) tester
probe to terminal VG, and negative ( ) tester probe
Voltmeter
to terminal E2G.
(4) Blow air into the intake air flow meter, and check that
the voltage fluctuates.
Air
HINT:
A66622
If operation is not as specified, replace the intake air flow meter.
(5) Turn the ignition switch to LOCK.
(6) Disconnect the intake air flow meter connector.
2. CAMSHAFT TIMING OIL CONTROL VALVE ASSY
(a) Resistance inspection.
(1) Using an ohmmeter, measure the resistance be-
tween the terminals.
Resistance: 6.9 to 7.9 &! at 20_C (68_F)
(b) Movement inspection.
1
2
(1) Connect the positive (+) lead from the battery to ter-
Valve
minal 1 and negative ( ) lead to terminal 2, and
check the movement of the valve.
NOTICE:
Confirm the valve does not adhere.
HINT:
Bad returning of the valve by entrance of foreign objects causes
subtle pressure leak to the advanced direction. Then, DTC can
B01689
be detected.
2004 COROLLA (RM1037U)
Author : Date : 956
10 3
ENGINE CONTROL SYSTEM  SFI SYSTEM
3. THROTTLE BODY ASSY
Throttle Stop Screw
(a) Check throttle body.
(1) Check that throttle valve shaft is not rickety.
(2) Check that each port is not stopped up.
(3) Check that throttle valve opens and closes smooth-
ly.
(4) Check that there is no clearance between the
throttle stop screw and throttle lever at the throttle
Throttle Lever
closed position.
A66635
NOTICE:
Do not adjust the throttle stop screw.
4. E.F.I. THROTTLE POSITION SENSOR
(a) Resistance inspection.
(1) Disconnect the throttle position sensor connector.
(2) Using an ohmmeter, measure the resistance be-
tween terminals VC and E2.
Resistance: 2.5 to 6.0 k&!
VTA E2 VC
(3) Check the change of resistance between terminals
1
2 3
VTA and E2.
Change of resistance:
A65173
The resistance value increases in proportion to the
throttle lever opening value.
HINT:
Throttle valve Resistance
Fully close 0.2 to 5.7 k&!
Fully open 2.0 to 10.2 k&!
2004 COROLLA (RM1037U)
Author : Date : 957
10 4
ENGINE CONTROL SYSTEM  SFI SYSTEM
5. E.F.I. ENGINE COOLANT TEMPERATURE SENSOR
(a) Resistance inspection.
(1) Using an ohmmeter, measure the resistance be-
Ohmmeter
tween each terminal.
Resistance:
At 20_C (68_F) 2.32  2.59 k&!
At 80_C (176_F) 0.310  0.326 k&!
NOTICE:
30
20
In case of checking the water temperature sensor in the wa-
10
ter, be careful not to allow water to go into the terminals,
5
and after checking, wipe out the sensor.
3
2
1
0.5
0.3
0.2
0.1
 20 0 20 40 60 80 100
(32) (80) (104)(140) (212)
( 4) (176)
TEMPERATURE_C(_F)
A50371
6. KNOCK CONTROL SENSOR
Ohmmeter
(a) Using an ohmmeter, measure the resistance between ter-
minals.
Resistance: 120  280 k&! at 20_C (68_F)
HINT:
If the resistance is not specified, replace the sensor.
A65174
7. E.F.I. CIRCUIT OPENING RELAY ASSY
(a) Continuity inspection.
(1) Using an ohmmeter, check that continuity exists be-
tween each terminal.
Specified condition:
Between terminals 1 and 2 Continuity
Between terminals 3 and 5 No continuity
(2) Using an ohmmeter, check that continuity exists be-
tween terminals 3 and 5 when the battery voltage is
E12471
applied across terminals 1 and 2.
8. E.F.I ECU RELAY
(a) Continuity inspection.
(1) Using an ohmmeter, check that continuity exists be-
tween each terminal.
Specified condition:
Between terminals 1 and 2 Continuity
Between terminals 3 and 5 No continuity
(2) Using an ohmmeter, check that continuity exists be-
tween terminals 3 and 5 when the battery voltage is
E12471
applied across terminals 1 and 2.
2004 COROLLA (RM1037U)
Author : Date : 958
RESISTANCE k
&!
10 5
ENGINE CONTROL SYSTEM  THROTTLE BODY ASSY
THROTTLE BODY ASSY
1008F 01
COMPONENTS
7.0 (71, 62 in.·lbf)
Clip
Vacuum Hose
Cylinder Head
Vacuum Hose
Cover No. 2
Air Cleaner Hose No. 1
Manifold Stay No. 2 (M/T)
13 (133, 9.6)
Water By pass Hose
30 (306, 22)
z Gasket
Accelerator Control
Cable Bracket Sub assy Water By pass
Hose
30 (306, 22)
Air Cleaner Cap
30 (306, 22)
13 (133, 9.6)
Accelerator
30 (306, 22)
Throttle Body Bracket
Control Cable Assy
2.0 (20, 18 in.·lbf)
E.F.I. Throttle Position Sensor
Throttle Body Assy
z Gasket
Throttle Body Idle Speed Control Valve Assy
3.7 (38, 33 in.·lbf)
N·m (kgf·cm, ft·lbf) : Specified torque
Non reusable part
z
A65206
2004 COROLLA (RM1037U)
Author : Date : 959
10 6
ENGINE CONTROL SYSTEM  THROTTLE BODY ASSY
1008G 02
Removal & Installation and Disassembly & Reassembly
1. DRAIN COOLANT(See page 16 7)
2. REMOVE CYLINDER HEAD COVER NO.2
(a) Remove 2 nuts, 2clips and the cylinder head cover No. 2.
A65077
3. REMOVE AIR CLEANER CAP SUB ASSY
(a) Disconnect the MAF connector.
(b) Disconnect the VSV connector.
(c) Disconnect 3 vacuum hoses, as shown in the illustration.
(d) Loosen an air cleaner hose clump and disconnect an air
cleaner hose No. 1.
(e) Remove the air cleaner cap.
A65177
4. REMOVE AIR CLEANER HOSE NO.1
5. SEPARATE ACCELERATOR CONTROL CABLE ASSY
6. REMOVE THROTTLE BODY ASSY
(a) Disconnect an throttle position sensor connector.
(b) Disconnect a throttle body ISC valve assy connector.
(c) Disconnect a PCV hose.
A65188
2004 COROLLA (RM1037U)
Author : Date : 960
10 7
ENGINE CONTROL SYSTEM  THROTTLE BODY ASSY
(d) Disconnect 2 water by pass hoses.
A65189
(e) Remove 5 bolts, 2 nuts, throttle body bracket and throttle
body. (Transaxle M/T)
A65190
(f) Remove 3bolts, 2nuts and throttle body. (Transaxle A/T)
A66636
(g) Remove 2 bolts and accelerator cable bracket.
A65192
7. REMOVE E.F.I. THROTTLE POSITION SENSOR
(a) Remove 2 screws and the throttle position sensor as
shown in the illustration.
A65181
2004 COROLLA (RM1037U)
Author : Date : 961
10 8
ENGINE CONTROL SYSTEM  THROTTLE BODY ASSY
8. REMOVE THLOTTLE BODY IDLE SPEED CONTROL
VALVE ASSY
(a) Remove 3 screws and the idle speed control valve assy.
(b) Remove the gasket from the throttle body.
A65182
9. INSTALL THLOTTLE BODY IDLE SPEED CONTROL VALVE ASSY
(a) Install a new gasket on the throttle body.
(b) Install the idle speed control valve assy with 3 screws.
Torque: 3.7 NÅ"m (38 kgfÅ"cm, 33 in.Å"lbf)
10. INSTALL E.F.I. THROTTLE POSITION SENSOR
(a) Check that the throttle valve is fully close.
(b) insert the throttle position sensor to the throttle body with
it turned counterclockwise by 30_ to 90_ against the fully
close valve position.
(c) By turning the throttle position sensor clockwise, tighten
2 screws.
Torque: 2.0 NÅ"m (20 kgfÅ"cm, 18 in.Å"lbf)
A65183
11. INSTALL THROTTLE BODY ASSY
(a) Install the accelerator control bracket with 2 bolts.
Torque: 13 NÅ"m (133 kgfÅ"cm, 9.6 ftÅ"lbf)
A65192
(b) Install a new gasket on the intake manifold, as shown in
the illustration.
A65184
2004 COROLLA (RM1037U)
Author : Date : 962
10 9
ENGINE CONTROL SYSTEM  THROTTLE BODY ASSY
(c) Install the throttle body with 5 bolts and 2 nuts.(Transaxle
B M/T)
B
A
Torque:
A 30 NÅ"m (306 kgfÅ"cm, 22 ftÅ"lbf)
A
B 13 NÅ"m (133 kgfÅ"cm, 9.6 ftÅ"lbf)
A
A
A
A65190
(d) Install the throttle body with 3 bolts and 2 nuts.(Transaxle
A/T)
Torque: 30 NÅ"m (306 kgfÅ"cm, 22 ftÅ"lbf)
A66636
(e) Connect 2 water by pass hoses to the throttle body.
A65189
(f) Connect the PCV hose to the throttle body.
(g) Connect the throttle body idle speed control valve assy
connector to the throttle body.
(h) Connect the throttle position sensor connector to the
throttle body.
A65188
12. INSTALL AIR CLEANER CAP SUB ASSY
(a) Install the air cleaner cap.
(b) Connect the air cleaner hose.
2004 COROLLA (RM1037U)
Author : Date : 963
10 10
ENGINE CONTROL SYSTEM  THROTTLE BODY ASSY
(c) Connect 3 vacuum hoses, as shown in the illustration.
(d) Connect the VSV connector.
(e) Connect the intake air flow meter connector.
A65177
13. INSTALL CYLINDER HEAD COVER NO.2
(a) Install the cylinder head cover No. 2 with 2 nuts and 2
clips.
Torque: 7.0 NÅ"m (71 kgfÅ"cm, 62 in.Å"lbf)
A65077
14. ADD COOLANT(See page 16 7)
15. CHECK ENGINE COOLANT LEAK(See page 16 1)
2004 COROLLA (RM1037U)
Author : Date : 964
10 11
ENGINE CONTROL SYSTEM  ECM (1ZZ FE) (April, 2003)
ECM (1ZZ FE) (April, 2003)
100HN 02
REPLACEMENT
1. DISCONNECT BATTERY NEGATIVE TERMINAL
2. REMOVE GLOVE COMPARTMENT DOOR ASSY (See Page 71 10)
3. REMOVE ECM
(a) Remove the 2 clips using a clip remover. Then, open the
cover.
(a) (a)
A83791
(b) Disconnect the 4 ECM connectors.
(c) Remove the wire harness from the wire harness clamp.
(b)
(b)
(b) (c)
(b)
A83792
(d) Remove the 2 bolts.
(e) Unfasten the claw and clip, then remove the ECM.
: Claw
: Clip
A83793
4. REMOVE ECM COVER
(a) Take the 2 double sided adhesive tapes off the ECM,
then remove the ECM cover.
2 Double sided
Adhesive Tapes
A83794
2004 COROLLA (RM1037U)
Author : Date : 965
10 12
ENGINE CONTROL SYSTEM  ECM (1ZZ FE) (April, 2003)
5. REMOVE ECM BRACKET NO.2 (DENSO MADE)
(a) Remove the 2 screws, then remove the ECM bracket No.
(a) 2.
(a)
A83795
6. REMOVE ECM BRACKET NO.1
(a) Remove the 2 screws, then remove the ECM bracket No.
1.
DENSO Made: DELCO Made:
(a) (a)
(a)
(a)
A83796 A84658
A84669
7. REMOVE ECM BRACKET NO.3 (DELCO MADE)
(a) Remove the 2 screws, then remove the ECM bracket No.
3.
(a)
(a)
A84659
8. INSTALL ECM BRACKET NO.3 (DELCO MADE)
Torque: 3.2 NÅ"m (33 kgfÅ"cm, 28 in.Å"lbf)
9. INSTALL ECM BRACKET NO.1
Torque: 3.2 NÅ"m (33 kgfÅ"cm, 28 in.Å"lbf)
10. INSTALL ECM BRACKET NO.2 (DENSO MADE)
Torque: 3.2 NÅ"m (33 kgfÅ"cm, 28 in.Å"lbf)
2004 COROLLA (RM1037U)
Author : Date : 966
10 13
ENGINE CONTROL SYSTEM  ECM (1ZZ FE) (April, 2003)
11. INSTALL ECM COVER
(a) Install a new ECM cover to the ECM as shown in the il-
lustration.
DENSO Made: DELCO Made:
1 to 6.2 mm (0.039 to 0.244 in.)
4.5 mm (0.177 in.)
0 to 2.5 mm
(0 to 0.098 in.)
5 mm 2 Double sided
(0.197 in.) Adhesive Tapes
2 Double sided
Adhesive Tapes
A84660 A84664
A84670
12. INSTALL ECM
Torque: 3.0 NÅ"m (31 kgfÅ"cm, 27 in.Å"lbf)
13. INSTALL GLOVE COMPARTMENT DOOR ASSY
14. CONNECT BATTERY NEGATIVE TERMINAL
Torque: 5.4 NÅ"m (55 kgfÅ"cm, 48 in.Å"lbf)
15. RESET MEMORY (A/T TRANSAXLE)
CAUTION:
Perform the RESET MEMORY (AT initialization) when replacing the ECM, engine assembly or auto-
matic transaxle assembly.
(a) The hand held tester only.
(1) Connect the hand held tester to the DLC3.
(2) Turn the ignition switch ON.
(3) Perform the RESET MEMORY procedure from the ENGINE menu.
CAUTION:
After performing the RESET MEMORY, be sure to perform the ROAD TEST as described earlier.
2004 COROLLA (RM1037U)
Author : Date : 967