AUDI A4 1996 B5 / 1.G AWM Engine Camshaft Timing Control Workshop Manual

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Camshaft timing control,
checking
The adjustment of the intake camshaft is
dependent on the engine load and engine speed.
Oil pressure is applied to the camshaft adjuster
(mechanical adjustment device) via the electrical
solenoid valve for camshaft adjustment.

Note:
Camshaft timing control only becomes active 25
seconds after starting engine.
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Camshaft adjustment solenoid valves,
checking

Special tools and equipment

VAG 1526 A
VAG 1527 B
VAG 1594 A
VAG 1598/31
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Test requirements:

Vehicle diagnostic, testing and information
system VAS 5051 or VAG 1551 Scan Tool
connected

Test sequence

- Initiate output Diagnostic Test Mode (DTM) and
activate solenoid valve for camshaft adjuster.
Output Diagnostic Test Mode Camshaft timing control

Display
If the valve is not actuated (does not click).
Checking internal resistance
This valve is actuated (clicks) for approx. one minute if the operation is
not switched to the next component by pressing the key.
- Check internal resistance of solenoid valve for camshaft adjuster.
- Switch ignition off.

- Disconnect connector -arrow- from camshaft adjuster.
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If specified value is not attained:
If specified value is attained:
Checking power supply
Test requirements:
Electrical Wiring Diagrams, Troubleshooting & Component Locations
binder
Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Fuel Injection & Ignition,
Engine Code(s): AWM, Repair Group 24
- Connect multimeter to valve to measure resistance.
Specified value: 10 to 18
- Replace solenoid valve for camshaft adjuster.
- Check power supply.
Fuse for solenoid valve for camshaft adjustment OK Fuel pump relay OK.

- Disconnect connector -arrow- from camshaft adjuster.
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If the LED does not light up:
Electrical Wiring Diagrams, Troubleshooting & Component Locations
binder
If the LED lights up: - Connect voltage tester VAG 1527 B as follows:Connector
contact
Measure to
1 Engine Ground
- Operate starter briefly.
LED should light up.
- Check wiring from contact 1 on connector via fuse to fuel pump relay
for open circuit:
- Correct open circuit, if necessary.
- Check actuation.
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Checking actuation

- Connect voltage tester VAG 1527 B to contacts 1 (positive) and 2 of
connector.
- Initiate output Diagnostic Test Mode (DTM) and activate solenoid valve
for camshaft adjuster.
Output Diagnostic Test Mode Camshaft timin
g control

Display
If the LED lamp does not flash or if it lights up continuously:
Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Fuel Injection & Ignition,
Engine Code(s): AWM, Repair Group 24

LED should flash.
- Connect the VAG 1598/31 test box to wiring harness leading to engine
control module (the engine control module should not be connected):
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If the wiring is OK:
If no fault is found: - Check for open circuit and short to positive or Ground in following
wiring connection: Connector
Contact
Test box VAG 1598/31
2 115
- If necessary, correct short circuit to Ground or open circuit.
- Replace engine control module.
- Replace mechanical camshaft adjuster.
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