28-1

Motronic Multiport Fuel
Injection (MFI) and ignition
system

Ignition system components

Notes:

Only components which specifically relate to

the ignition system are dealt with here. For
other components of the fuel injection and
ignition system

Repair Group 24.

The fuel injection and ignition system Engine

Control Module (ECM) is equipped with On
Board Diagnostic (OBD).

Components marked with an asterisk (*) are

checked via the On Board Diagnostic (OBD)
program.

Check Diagnostic Trouble Code (DTC) memory

before carrying out repairs and troubleshooting

Page 01-13

.

Safety precautions

Page 28-5

Technical data, spark plugs

Page 28-7

28-2

Ignition system, servicing

Note:

Engine Control Module (ECM) -J220-* with connector

Page 24-9

, item 12 .

1 - Ignition wires

Check for continuity

2 - Suppressor

0.6-1.4 k

3 - Terminal 1

4 - Terminal 15

5 - Ignition coil power output stage -N157-*

Checking

Page 28-31

6 - 10 Nm (7 ft lb)

7 - Ignition coil -N152-

Checking

Page 28-30

8 - Connector

3-pin

9 - Ground (GND) strap

28-3

10 - Knock Sensor (KS) 1 -G61-*

11 - 20 Nm (15 ft lb)

Tightening torque influences function of knock

sensor

12 - Spark plug connector

Use 3277 when disconnecting and connecting

4-6 k

13 - Spark plug

30 Nm (22 ft lb)

Remove and install with 3122B

Type and electrode gap

Page 28-7

14 - 25 Nm (18 ft lb)

15 - Clamp

16 - O-ring

Replace if damaged

17 - Camshaft Position (CMP) sensor -G40-*

Installing

Page 28-8

Checking camshaft position sensor

Page 28-22

28-4

18 - Dust cap

19 - Rotor arm

Marking: R1

0.6-1.4 k

20 - Distributor cap

Check for cracks and signs of tracking

Check contact wear

Clean before installing

Check carbon brush for wear and freedom of

movement

21 - Screening cap

28-5

Safety precautions

WARNING!

Be alert when working on or near the engine.
High ignition secondary voltage can cause
serious personal injury and damage vehicle
components.

DO NOT touch or disconnect ignition system
wires when the engine is running or being
cranked at starting RPM.

DO NOT operate the starter if the fuel
injectors have been removed.

Be sure the ignition is switched OFF, when:

Disconnecting ignition wires

Disconnecting fuel injection system wiring

Connecting or disconnecting test equipment
leads

Disconnecting the battery

Washing the engine or engine
compartment.

BEFORE cranking the engine at starting RPM
(such as for compression testing) disable the
ignition and fuel injection systems:

Disconnect the ignition coil power output
stage.

Disconnect harness connectors from all fuel
injectors.

After the work is completed, erase
Diagnostic Trouble Code (DTC) memory.

28-6

CAUTION!

BEFORE disconnecting the battery:

Stop the engine.

Be sure the ignition is switched OFF (also
applies when connecting the battery). Failure
to do so may damage the Engine Control
Module (ECM).

Be sure of the proper radio code (for vehicles
equipped with coded anti-theft radio).

Be sure the battery negative (-) cable is
disconnected, when:

Working on the electrical system

Resistance (spot) welding or electric arc
welding anywhere on the vehicle.

When connecting and disconnecting
electrical test equipment (LED voltage tester,
multimeter, etc.):

Be sure the ignition is switched OFF.

Use correct adapters from the VW 1594
connector test kit.

For any work affecting the Engine Control
Module (ECM):

BEFORE disconnecting the ECM harness
connector, switch the ignition OFF and WAIT
at least 20 seconds. Failure to do so may
damage the ECM.

DO NOT connect any outside voltage source
to stimulate an output signal at the ECM.

28-7

Technical data, spark plugs

Engine code

ABA

Ignition timing

1)

Checking

Page 28-14

Firing order

1-3-4-2

Spark plugs

VW/Audi

101 000 044 AA

Manufacturer's

designation

FR 8 DS

Electrode gap

0.8 mm (0.032)

2)

Tightening torque

30 Nm (22 ft lb)

1)

Not adjustable

2)

Gap between Ground (GND) electrode and

center electrode insulation

28-8

Distributor, removing and installing

Special tools, testers and auxiliary items

Pin wrench Matra V159

VAG 1331 torque wrench (5-50 Nm)

Note:

The Engine Control Module (ECM) requires the
no. 1 cylinder TDC signal from the camshaft
position sensor to orient the fuel injection and
knock sensor systems as per firing order.

Checking no. 1 cylinder TDC markings:

- Set flywheel -A- or drive plate -B- to TDC no. 1 cylinder.

28-9

Engine removed

- Set vibration damper (V-belt pulley) to TDC no. 1 cylinder.

Mark on camshaft sprocket must align with arrow on cylinder head cover.

28-10

Removing and installing distributor

Test conditions

Work sequence

Mark on distributor must align with mark on rotor arm or camshaft position

sensor cover.

Crankshaft and camshaft in no. 1 cylinder TDC position

- Remove distributor.

- Before installing the distributor, align oil pump shaft drive tongue parallel to

crankshaft.

28-11

Note:

When installing, turn rotor arm slightly right of the distributor marking. When
inserting, rotor arm will turn back to the marking.

- Install distributor. The pins on the distributor must point toward mounting bolt

threaded hole (arrow).

If not able to align markings:

Mark on distributor must align with mark on rotor arm or camshaft position

sensor cover.

- Tighten distributor mounting bolt.

Tightening torque: 25 Nm (18 ft lb)

- Loosen belt tensioner and take toothed drive belt off camshaft sprocket.

28-12

- Turn intermediate shaft sprocket with toothed drive belt in direction shown

(arrow), until rotor arm aligns with markings for no. 1 cylinder on distributor
housing (toothed drive belt slides over crankshaft sprocket).

Note:

For easier installation of the toothed drive belt, loosen belt tensioner lock nut only
approx. one thread.

Mark on distributor must align with mark on rotor arm or camshaft position

sensor cover.

- Place toothed drive belt on belt tensioner and camshaft sprocket.

28-13

- To tighten toothed drive belt, turn tensioner with pin wrench (e.g. Matra V159) in

direction shown (arrow).

Drive belt is correctly tensioned if it can be turned 90 with the thumb and

forefinger halfway between camshaft and intermediate shaft sprockets.

- Tighten tensioner lock nut.

Tightening torque: 45 Nm (33 ft lb)

- Rotate crankshaft two full turns and check adjustment.

- Check distributor housing and rotor arm markings.

- Install upper toothed belt protective cover.

- Before installing, clean distributor cap and check for cracks and signs of carbon

tracking, replace if necessary.

28-14

Ignition timing, checking

Special tools, testers and auxiliary items

VAG 1551/1552 scan tool with VAG 1551/3

adapter cable

Test conditions

Electrical consumers turned off (radiator

coolant fan must not run during the check)

Air conditioner turned off

Test sequence

- Connect VAG 1551 scan tool (VAG 1552) and

select "Engine Electronics" address word 01

Page 01-7

. When doing this the engine must be

running at idle speed.

Rapid data transfer

HELP

Select function XX

Indicated on display

- Press buttons -0- and -8- to select "Read Measuring Value Block" function 08

and press -Q- button to confirm input.

Read Measuring Value Block

HELP

Indicated on display

Input display group number XXX

- Press buttons -0-, -1- and -0- to input display group 010 and press -Q- button to

confirm input.

Read Measuring Value Block

10

1

2

3

4

Indicated on display (1-4

Display fields)

- Check measured values for ignition (display fields 3 and 4).

28-15

Display fields

1

2

3

4

Display group 010: Ignition 1

Display

xxx RPM

xx.x ms

xx.x

xx.x

Indicated

Engine speed Engine load Ignition angle (mapped value)

Ignition angle

Working
range

800 - 6000

RPM

0.0 - 25.0

ms

0.0 - 50.0

BTDC

0.0 - 40.0

BTDC

Specification

800 - 880

RPM

1.5 - 2.5 ms

11.0 - 13.0

BTDC

Max. 2.0

deviation from display field 3

-

-

Test conditions:

If the specification is not attained

page 24-71

, checking throttle valve

control module

Intake manifold temperature max. 50 C (122 F)

- Read the readiness code

Page 01-32

. If DTC

memory has been erased, verify repair via
appropriate display group

Page 01-34

,

Readiness code, creating.

- Press

button.

- Press buttons -0- and -6- to select "End Output"

function 06 and press -Q- button to confirm
input.

28-16

Misfire detection, checking

Special tools, testers and auxiliary items

VAG 1551/1552 scan tool with VAG 1551/3

adapter cable

Test sequence

- Connect VAG 1551 scan tool (VAG 1552) and

select "Engine Electronics" address word 01

Page 01-7

. When doing this the engine must be

running at idle speed.

Rapid data transfer

HELP

Select function XX

Indicated on display

- Press buttons -0- and -8- to select "Read measuring value block" function 08 and

press -Q- button to confirm input.

Read Measuring Value Block

HELP

Input display group number XXX

Indicated on display

- Press buttons -1-, -1- and -0- to input display group 110 and press -Q- button to

confirm input.

Read Measuring Value Block 110

1

2

3

4

Indicated on display (1-4

Display fields)

- Check the specifications for misfire detection (display fields 2-4).

28-17

Display fields

1

2

3

4

Display group 110: Misfire detection 1

Display

x.xx ms

xxx

xxx

xxxxxxxx

Indicated

Engine

load

Misfiring adversely affecting

exhaust gas (total)

Misfiring adversely affecting three way

catalytic converter (total)

Misfiring recognition

status

Working
range

0.00 - 25.00

ms

-

-

-

Specification

1.00 - 3.00

ms

0

0

00000000

-

If the specification is not attained

Page 28-18

, evaluating display group 110

- Read the readiness code

Page 01-32

. If DTC

memory has been erased, verify repair via
appropriate display group

Page 01-34

,

Readiness code, creating.

- Press

button.

- Press buttons -0- and -6- for the "End Output"

function and press -Q- button to confirm input.

28-18

Evaluating display group 110

Display group: 110

Display field: 2 + 3 Possible malfunction cause

Malfunction elimination

More than 25

Ignition coil faulty

Ignition wire faulty

Spark plug faulty

- Check ignition coil

Page 28-30

- Checking components of ignition system

Page 28-1

Fuel injector faulty

Fuel shortage

- Check fuel injectors

Page 24-119

- Check quantity of fuel in tank

28-19

Ignition timing control, checking

Special tools, testers and auxiliary items

VAG 1551/1552 scan tool with VAG 1551/3

adapter cable

Test conditions

Electrical consumers turned off (radiator

coolant fan must not run during the check)

Air conditioner turned off

Engine oil temperature at least 80 C (176

F)

Test sequence

- Connect VAG 1551 scan tool (VAG 1552) and

select "Engine Electronics" address word 01

Page 01-7

. When doing this the engine must be

running at idle speed.

Rapid data transfer

HELP

Select function XX

Indicated on display

- Press buttons -0- and -8- to select "Read Measuring Value Block" function 08

and press -Q- button to confirm input.

Read Measuring Value Block

HELP

Input display group number XXX

Indicated on display

- Press buttons -0-, -1- and -0- to input display group 010 and press -Q- button to

confirm input.

28-20

Read Measuring Value Block

10

1

2

3

4

Indicated on display (1-4

Display fields)

- Check the measured values for ignition timing control (display fields 1-4).

Display fields

1

2

3

4

Display group 010: Ignition 1

Display

xxx RPM

xx.x ms

xx.x

xx.x

Indicated

Engine speed

Engine load

Ignition angle (mapped

value)

Ignition angle

Working range 800 - 6000 RPM

0.0 - 25.0

ms

0.0 - 40.0

BTDC

0.0 - 40.0

BTDC

Specification

800 - 880 RPM

1.9 - 2.1 ms

11.0 - 13.0

BTDC

Max. 2.0

deviation from display field

3

2480 - 2520

RPM

1.7 - 1.9 ms

23.0 - 25.0

BTDC

Max. 2.0

deviation from display field

3

-

-

Test condition:

If the specification is not attained

Page 28-21

, continuation

Intake manifold temperature max. 50 C (122 F)

28-21

Continuation

- Check engine operating conditions

Page 24-

63

- Check throttle valve control module

Page 24-

71

- Check knock sensor and knock control

Page

28-25

If the specification is again not attained:

- Replace Engine Control Module (ECM) -J220-

Page 24-9

, item 12 .

- Read the readiness code

Page 01-32

. If DTC

memory has been erased, repair must be
verified via appropriate display group

Page

01-34

, Readiness code, creating.

28-22

Camshaft Position (CMP) sensor,
checking

Special tools, testers and auxiliary items

VAG 1598/18 test box

Multimeter (Fluke 83 or equivalent)

Connector test kit VW 1594

Wiring diagram

Test sequence

- Disconnect 3-pin connector from camshaft position sensor.

- Connect multimeter using test leads from VW 1594 to measure voltage at

terminals 1 and 3 of connector.

- Turn on ignition.

- Measure voltage between terminals 1 and 3.

Specification: 9-14.5 volts

- Turn off ignition.

28-23

If the specification is not attained:

- Connect VAG 1598/18 test box to Engine Control Module (ECM) wiring harness.

- Check wiring between test box and 3-pin connector for open circuit using wiring

diagram.

Terminal 1 and test box socket 56

Terminal 2 and test box socket 44

Resistance: max. 1.5 ohms (

)

- Check wire between 3-pin connector and relay panel -G1/4- for open circuit

using wiring diagram.

Terminal 3 and relay panel -G1/4-

Resistance: max. 1.5 ohms (

)

28-24

- Additionally check all wires for short circuit to

each other.

Terminal 3 and test box socket 44

Terminal 3 and test box socket 56

Terminal 2 and test box socket 56

Specification:

ohms (

)

If no wiring malfunction is detected and voltage
was present between terminals 1 and 3:

- Replace distributor with camshaft position

sensor

Page 28-3

, Item 17 .

If no wiring malfunction is detected and no
voltage was present between terminals 1 and 3:

- Replace Engine Control Module (ECM) -J220-

Page 24-9

, item 12 .

-

Read the readiness code

Page 01-32

. If DTC

memory has been erased, verify repair via

appropriate display group

Page 01-34

,

Readiness code, creating.

28-25

Knock Sensor (KS) and knock control,
checking

Special tools, testers and auxiliary items

VAG 1551/1552 scan tool with VAG 1551/3

adapter cable

VAG 1598/18 test box

Multimeter (Fluke 83 or equivalent)

Connector test kit VW 1594

Wiring diagram

Test sequence

- Connect VAG 1551 scan tool (VAG 1552) and

select "Engine Electronics" address word 01

Page 01-7

. When doing this the engine must be

running at idle speed.

Rapid data transfer

HELP

Select function XX

Indicated on display

- Press buttons -0- and -8- to select "Read Measuring Value Block" function 08

and press -Q- button to confirm input.

Read Measuring Value Block

HELP

Input display group number XXX

Indicated on display

- Press buttons -0-, -4- and -5- to input display group 045 and press -Q- button to

confirm input.

Read Measuring Value Block

45

1

2

3

4

Indicated on display (1-4

Display fields)

28-26

Note:

The check must be carried out during a test drive
as knock control is not active with an engine load
exceeding 3 ms.

- Perform test drive and observe specification for

knock control on display (second technician
necessary).

Display fields

1

2

3

4

Display group 045: Knock control

Display

xx.xx

xx.xx

xx.xx

xx.xx

Indicated

Ignition angle correction

cylinder 1

Ignition angle correction

cylinder 2

Ignition angle correction

cylinder 3

Ignition angle correction

cylinder 4

Working
range

0.0 - 15.0

0.0 - 15.0

0.0 - 15.0

0.0 - 15.0

Specification

0.0 - 12.0

0.0 - 12.0

0.0 - 12.0

0.0 - 12.0

If the specification is not attained

page 28-27

, evaluating display group 045

-

Read the readiness code

page 01-32

. If DTC

memory has been erased, verify repair via
appropriate display group

Page 01-34

,

Readiness code, creating.

- Press

button.

- Press buttons -0- and -6- to select "End Output"

function 06 and press -Q- button to confirm
input.

28-27

Evaluating display group 045

Display group: 045

Display fields: 1-4

Possible malfunction cause

Malfunction

elimination

All cylinders more than 12

Knock sensor faulty

- Continuation

Page 28-28

Connector corroded

Knock sensor incorrectly

tightened

- Loosen knock sensor and tighten to 20 Nm (15 ft lb)

Attached components on

engine loose

- Tighten attached components

Poor fuel quality

- Change fuel type

One cylinder deviates greatly

from the others

Connector corroded

- Continuation

Page 28-28

Engine damage

Repair Manual, 2.0 Liter 4-Cyl. 2V Engine Mechanical, Engine

Code(s): ABA, Repair Group 13

- Check compression pressures:

Attached components on

engine loose

- Tighten attached components

28-28

Continuation

If the specification is attained:

- Disconnect blue 3-pin connector -2- from Knock Sensor (KS) 1 -G61- -1-.

- Connect multimeter with test leads from VW 1594 to measure resistance

between terminals 1 and 2, 1 and 3, and 2 and 3 on knock sensor connector.

Specification

ohms (

)

- Connect VAG 1598/18 test box to ECM wiring harness.

28-29

If no wiring malfunction is detected:

If the malfunction is still present (malfunction again in Diagnostic Trouble Code
(DTC) memory):

- Check wiring between test box and 3-pin connector for open circuit according to

wiring diagram.

Terminal 1 and test box socket 34

Terminal 2 and test box socket 33

Terminal 3 and test box socket 56

Resistance: max. 1.5 ohms (

)

- Additionally check wires for short to one another.

Terminal 3 and test box socket 34

Terminal 3 and test box socket 33

Terminal 2 and test box socket 34

Specification:

ohms (

)

- Loosen knock sensor and tighten again to 20 Nm (15 ft lb).

- Replace Knock Sensor (KS) 1 -G61-

Page 28-3

, item 10 .

-

Read the readiness code

Page 01-32

. If DTC memory has been erased,

verify repair via appropriate display group

Page 01-34

, Readiness code,

creating.

28-30

Ignition coil, checking

Special tools, testers and auxiliary items

Multimeter (Fluke 83 or equivalent)

Connector test kit VW 1594

Test sequence

- Disconnect connector and ignition wire from

ignition coil -N152-.

- Connect multimeter with test leads from VW

1594 to measure resistance.

If the specifications are not attained:

- Check ignition coil primary resistance with multimeter (Fluke 83 or equivalent)

between terminals 1 and 15.

Specification: 0.5-1.2 ohms (

)

- Check ignition coil secondary resistance with multimeter between terminals 4

and 15.

Specification: 3-4 k

- Replace ignition coil -N152-

Page 28-2

, item 7 .

28-31

Ignition coil power output stage,
checking

Special tools, testers and auxiliary items

VAG 1598/18 test box

Multimeter (Fluke 83 or equivalent)

VAG 1527B voltage tester

Connector test kit VW 1594

Wiring diagram

Checking voltage supply

- Disconnect 3-pin connector from ignition coil.

- Connect multimeter using test leads from VW 1594 to measure voltage at

terminals 1 and 3 of connector.

- Turn on ignition.

- Measure voltage between terminals 1 and 3.

If the specification is not attained:

Specification: 9-14.5 volts

- Turn off ignition.

28-32

- Check wire between 3-pin connector contact 1

and Ground for open circuit according to wiring
diagram.

Wire resistance: Max. 1.5 ohms (

)

- Check wire between 3-pin connector contact 3

and relay plate for open circuit according to
wiring diagram.

Resistance: max. 1.5 ohms (

)

If no wiring malfunction is detected and voltage
was present between terminals 1 and 3:

- Replace ignition coil -N152-

Page 28-2

, item

7 .

If no wiring malfunction is detected and no
voltage was present between terminals 1 and 3:

- Replace Engine Control Module (ECM) -J220-

Page 24-9

, item 12 .

- Read the readiness code

page 01-32

. If DTC

memory has been erased, verify repair via

appropriate display group

Page 01-34

,

Readiness code, creating.

Checking activation

- Disconnect the engine harness center connector

Page 24-2

, item 11 .

- Connect VAG 1527B voltage tester with test leads from VW 1594 and adapters

VW 1594/15 to terminals 2 and 3 of the connector.

28-33

- Operate starter and check ignition signal from

ECM.

LED must flicker

- Turn off ignition.

If the LED does not flicker:

If no wiring malfunction is detected and voltage was present between terminals 1
and 3:

- Connect VAG 1598/18 test box to ECM wiring harness.

- Check wiring between 3-pin connector and test box for open circuit according to

wiring diagram.

Terminal 2 and test box socket 8

Resistance: max. 1.5 ohms (

)

- Additionally check the wiring for short circuit to each other.

Terminal 1 and test box socket 8

Terminal 3 and test box socket 8

Specification:

ohms (

)

- Replace ECM -J220-

Page 24-9

, item 12 .

- Read the readiness code

Page 01-32

. If DTC memory has been erased,

verify repair via appropriate display group

Page 01-34

, Readiness code,

creating.

28-34

If the voltage supply and activation is OK.:

- Reconnect 3-pin harness connector and ignition

wire to ignition coil.

CAUTION!

During the following test do not touch the terminals of the ignition coil or test
cables.

- Connect LED voltage tester with test leads to terminals 1 and 15 on ignition coil.

- Operate starter.

The LED must flicker

- If necessary, replace ignition coil power output stage.