1997 AUDI A8 AHA Engine Camshaft Adjustment System Checking Workshop Manual

28-34

Checking solenoid valves for camshaft
adjustment electrically

- Disconnect harness connector from valve.

If resistance is not as specified: - Using multimeter with auxiliary wires from VAG1594, measure
resistance across terminals on valve.
Specified value: 10-18 ohms
- Replace solenoid valve.
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28-35

Checking voltage supply of valves for
camshaft adjustment

- Disconnect harness connector from valve.

If LED does not light up, conduct the following tests:
Electrical Wiring Diagrams, Troubleshooting & Component Locations
binder - Connect LED tester VAG1527 between engine ground and terminal 1
of connector (B+).
- Crank starter for several seconds (engine can start).
LED in voltage tester must light up.
- Check fuse for valves for camshaft adjustment.
- Check wiring from terminal 1 on 2-pin connector to fuse for continuity
per wiring diagram. - Check fuel pump relay and signal to relay page 24
-95
.
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28-36

Checking signal to valves for camshaft
adjustment

- Disconnect harness connector from valve.

If LED does not flash or stays on continuously:
If LED does not flash: - Connect LED tester VAG1527 between connector terminals 1 and 2.
- Check using output DTM and activate camshaft adjustment page
01
-51
.
LED must flash.
- Connect VAG1598/22 test box to Motronic ECM harness connector (
page 01
-67
) and proceed as follows:
- Check wiring from terminal 2 of connector for valve to terminal 55 of
ECM/test box for continuity and short circuit to B+.
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28-37
If LED stays lit constantly:

If the wiring is OK:
If no malfunction has been found in any of the previous tests:
Repair Manual, 2.8 Liter V6 5V Engine Mechanical, Repair Group 15. - Check wiring between valve connector terminal 2 and ECM/test box
terminal 55 for short circuit to Ground.

Specified value: max. 1 .- 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
(DTC) memory has been erased, or ECM was disconnected, generate
new readiness code page 01
-73
.
- Replace respective mechanical camshaft adjuster.
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11/23/2002 htt
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play?action=Goto&t
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pair&id=AUDI.B5.FU03.28.2