wiring diagram AUDI A6 1998 C5 / 2.G ATQ Engine Ignition System Checking Workshop Manual
Page 12 of 65
28-10
Checking Ground (GND) supply of power
output stage
If LED does not light up:
Electrical Wiring Diagrams, Troubleshooting & Component Locations
binder - Connect VAG1527B voltage tester as follows:Harness connector
Terminal
Measure to
2 B+
LED must light up.
- Check the wire connection for open circuit:
- Repair open circuit if necessary.
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Page 13 of 65
28-11
Checking voltage supply to ignition coils
Note:
Voltage is supplied to ignition coils via Fuel
Pump (FP) relay.
Test requirement:
Fuse for ignition coils OK
Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder
If LED does not light up: - Connect VAG1527B voltage tester as follows:Harness connector
Terminal
Measure to
1 Engine Ground (GND)
- Operate starter.
LED must light up.
- Check the wire connection for open circuit:
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Page 14 of 65
Electrical Wiring Diagrams, Troubleshooting & Component Locations
binder - Repair open circuit if necessary.
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Page 34 of 65
28-31
Test requirements:
Fuse for Engine Control Module (ECM) OK
Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder
Battery voltage at least 12.7 V
Generator OK
Test sequence
- Connect VAG1598/31 test box at wiring harness
to ECM, do not connect ECM Page 24
-17
.
- Switch ignition on.
Note:
The plus voltage supply for the Engine Control
Module (ECM) travels via connector terminal 3
(terminal 15) and connector terminal 62
(terminal 30).
Ground (GND) supply of the Engine Control
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Page 37 of 65
- Check wire connections.
Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder
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