Fault-Tracing

Fault-tracing

Checking components and wiring
Activate the control valve (2) to check its function. The valve must click at activation.
Connect a vacuum pump to the control valve terminal (for hoses connected to the intake manifold) and pump a vacuum. Listen for leakage. Check the stability of the pressure on the gauge. The valve is leaking if the pressure drops.
Check the vacuum hoses for leakage and blockages between:
- the intake manifold and the vacuum tank (1)
- the vacuum tank (1) and the control valve(2)
- the control valve (2) and the vacuum motor (3)
Check that all vacuum hoses are correctly connected on the above components.
Check that the dampers (4) can move freely and that nothing is obstructing them.

Hint: Check the function by pumping a vacuum to the vacuum motor.

Remedy as necessary.

Other information
- For control valve replacement: Distribution damper intake manifold, B8444S Service and Repair





Continue - Verification

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Fault-tracing information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - Exit Fault-Tracing

No - Attempt New Test

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Attempt New Test - Checking components and wiring

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Verification




Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Reconnect the connectors, components, etc.
- Start the engine.
- Test drive the car on the road with smooth acceleration so that the engine speed (rpm) exceeds 3500 rpm. Repeat the procedure a couple of times so that the engine control module (ECM) can carry out diagnostics.
- Connect VCT2000 to the data link connector without switching off the engine.
- Read the diagnostic status and fault status for the diagnostic trouble code by selecting the diagnostic trouble code in the list.

Note! If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated.

Check the fault status for the diagnostic trouble code when the scan is "Implemented". When the function is correct the fault status should be "No fault found" when the scan is implemented.





Is the function OK?

Yes - Troubleshooting complete for this DTC

No - Fault-tracing information

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