ignition AUDI A4 1996 B5 / 1.G AFC Engine Ignition System Servising Workshop Manual

28-7


Ignition system, servicing
1 -
Engine Control Module (ECM) -J192-
2 -
ECM signal wires
4-pin, light-brown
3 -
Power output stage -N122- For ignition coils
4 -
Ignition coil primary connections 3-pin, dark brown
5 -
Harness connector 3-pinFor Knock Sensor (KS) 2 -G66-
6 -
Camshaft Position (CMP) sensor -G40-
7 -
Engine speed (RPM) sensor -G28-
8 -
Crankshaft Position (CKP) sensor -G4-
9 -
Knock Sensor (KS) 2 -G66-
10 -
Ignition coils 1, 2 and 3; -N-, -N128- and -
N158-
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28-8


11 -
Knock Sensor (KS) 1 -G61-
12 -
Spark plug connector
13 -
Harness connector
3-pin, grayFor engine speed (RPM) sensor -G28-
14 -
Harness connector 3-pin, blackFor Crankshaft Position (CKP) sensor -G4-
15 -
Harness connector 3-pinFor Knock Sensor (KS) 1 -G61-
16 -
Harness connector 3-pin, white, voltage supplyFor ignition coils 1, 2 and 3, -N-, -N128-
and -N158-
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28-9


17 -
To fuse for ignition coils
18 -
ECM connector E
12-pin, black
19 -
ECM connector A 24-pin, black
20 -
ECM connector B 24-pin, red
21 -
ECM connector C 24-pin, brown
22 -
ECM connector D 12-pin, brown
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28-11

Safety measures


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.
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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 six
fuel injectors.
After the work is completed, erase
Diagnostic Trouble Code (DTC) memory.
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28-12

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
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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.
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