Faulty Position

ECM-644A CAMSHAFT RESET VALVE
FAULTY POSITION

Checking the fault type



Read out the adapted values for the camshaft. There are 4 values, one for each flank.

If one of the adaptation values is 20 degrees, the camshaft reset valve has stuck. Replace the camshaft reset valve.

If one of the adaptation values is less than 9 degrees, the camshaft reset valve is defective. Replace the camshaft reset valve.

If any of the adaptation values is between 10 and 19 degrees, the variable camshaft must be adjusted in relation to the crankshaft. Adjust the camshaft.

Remedy as necessary

Other information:
- To adjust the camshaft position (CMP), Camshaft Seals/Variable Valve Timing (VVT) Unit, Replacing
- To replace the camshaft reset valve, Variable Valve Timing Solenoid, Replacing


Verification



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

- Ignition off.
- Reinstall the connectors, components etc.
- Ignition on.
- Start the engine. Let it idle for at least 30 seconds.
- Neutralize the idling conditions. Carefully depress the accelerator pedal (AP) for 5 seconds, keeping the engine speed (RPM) below 1,200 rpm.
- Then release the accelerator pedal (AP) so that the engine returns to idling.
- Read the adaptation values for the camshaft. Check that all values are below 7 degrees.

Are all adaptation values below 7 degrees?
Yes - Testing Complete.
No - Continue below.


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.