Faulty Signal

Faulty signal

Checking the component




- Start the engine
- Activate reading off the actual and desired values for the reset valve. Check that they are approximately the same at different engine speeds (RPM)
- These values cannot be checked at idle speed. The variable valve timing is normally at 0 CA, even if a fault is stored. When the car is stationary, it may be difficult for the variable valve timing (VVT) to change unless a quick and powerful surge occurs. This is because the load is too low. However, variable valve timing (VVT) is always activated at extremely high engine speeds (RPM).
Check that the timing belt has not jumped off the cogs. Check that the camshafts are in the correct position.
Check the oil level and oil quality.

Hint: Faults may result from dirt in the camshaft reset valve. Try cleaning the valve.

Try a new camshaft reset valve if the above fault-tracing does not solve the fault.
Remedy as necessary.

Other information:
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box
- To clean the camshaft reset valve, see VVT solenoid, inspection and cleaning VVT Solenoid, Inspection and Cleaning
- To set the camshafts correctly, see Camshaft seal/variable valve timing (VVT) unit, replacing Camshaft Seal/Variable Valve Timing (VVT) Unit, Replacing
- For information about diagnostic functions for the camshaft reset valve, see Camshaft diagnostics. Description and Operation
- To access and replace the camshaft reset valve (VVT) on the exhaust side, see Camshaft seal/variable valve timing (VVT) unit, replacing Camshaft Seal/Variable Valve Timing (VVT) Unit, Replacing
- For information about signals, see Signal specification Signal Description / Specification
- To fault-trace the wiring and terminals, see Checking wiring and terminals Checking Wiring And Terminals.










Continue - Verification

-------------------------------------------------

Verification




Verification

Verification

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








- Ignition off
- Reinstall the connectors, components etc.
- Ignition on.
Activate reading off the actual and desired values for the reset valve. Check that they are approximately the same at different engine speeds (RPM).
The values cannot be compared at idle speed, when variable valve timing (VVT) is at 0. Variable valve timing (VVT) is also at 0 when a fault is stored. When the car is stationary, it may be difficult for the variable valve timing (VVT) to change unless a quick and powerful surge occurs. This is because the load is too low. However, variable valve timing (VVT) is always activated at extremely high engine speeds (RPM).
Is the function OK?





Is the value within its permitted range?

Yes - VERIFIED

No - VERIFICATION FAILED

------------------------

VERIFIED - Fault Found

VERIFICATION FAILED - Fault-tracing information

-------------------------------------------------

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 - FAULT-TRACING FAILED

No - Attempt New Test

------------------------

FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking the component

-------------------------------------------------