ignition AUDI A4 2000 B5 / 1.G AHA Engine Auxiliary Signals Checking Workshop Manual

- Press buttons -0- and -6- to select "End Output"
function 06, and press -Q- button to confirm
input.

- Switch off ignition.
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Continuation
If no speed was indicated:

Notes:
If the LED does not blink:
If the wiring is OK and the LED does not blink:
Repair Manual, Electrical Equipment, Repair Group 90
- Connect VAG1598/22 test box to ECM harness connector page 01
-
67
.
- Connect VAG1527B LED voltage tester between ECM/test box sockets
3 (B+) and 20 (signal).
- Lift vehicle at left-front until wheel is free.
- Switch ignition on and rotate left-front wheel by hand.
LED must blink (very brief blink)
The right-front wheel must not rotate; block it if necessary.For LEDs with little voltage consumption, the LED lights up at half
strength when the ignition is switched on.
- Check wiring from ECM connector, terminal 20 to instrument cluster for
open circuit or short circuit Electrical Wiring Diagrams,
Troubleshooting & Component Locations binder.
-
Check readiness code page 01
-70
. If Diagnostic Trouble Code
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Checking

- Check DTC memory of Transmission Control
Module (TCM).
Repair Manual, 5 Spd. Automatic
Transmission 01V, Repair Group 01 If a DTC regarding the CAN-Bus wire is also
stored in the TCM:

- Switch ignition off.

Electrical Wiring Diagrams, Troubleshooting & Component Locations
binder
If wiring is OK: - Connect VAG1598/22 test box to ECM harness connector page 01
-
67
.
- Check wires from terminal 29 and terminal 41 of test box to
transmission control module for open or short circuit per wiring
diagram. - Replace Transmission Control Module (TCM) and Engine Control
Module (ECM) as necessary and in sequence.
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Test requirements

ECM coding OK page 01
-14


Test sequence

- Switch ignition off.

- Connect VAG1598/22 test box to ECM harness
connector page 01
-67
.

Electrical Wiring Diagrams, Troubleshooting & Component Locations
binder
If the wiring is OK:
If the malfunction occurs again after the ABS control module has been
replaced: - Check signal wiring between ECM/test box terminal 45 and ABS
control module for short circuit or open circuit. - Replace ABS control module.
- Replace Motronic ECM -J220- page 01
-68
.
- Carry out adaptation of throttle valve control module to ECM page
24
-150
.
-
Check readiness code page 01
-70
. If Diagnostic Trouble Code
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pair&id=AUDI.B5.FU03.24.4