Slow/Faulty

Slow/Faulty

Checking the status

Hint: Diagnostic trouble code (DTC) may be caused by a damaged fuse. Check the fuse for the power supply to the camshaft reset valve.




- Start the engine
- Read off the camshaft opening angle and the camshaft opening angle, desired value
- Active the quick test of camshaft control by clicking the start button
- Increase the engine speed (RPM) to approximately 2500 rpm and keep the engine running at this speed.
When the engine speed (RPM) increases, the control module will start the quick test to guide the camshaft to the different target values.
During the quick test, check that the closing angle of the camshaft (actual value) corresponds to the desired camshaft closing angle (target value) to an accuracy of ±10°. If the values do not correspond to an accuracy of ±10°, the function is faulty.
Deviation between the values can be read off in the lower display.
Carry out the check for approximately 15 seconds at an engine speed (RPM) of 2500 rpm. When the desired value is stable once again, the test has been completed. To restart the test, let the engine return to idle speed, then increase the engine speed to approximately 2500 rpm again.
The fault is intermittent if the function is OK.

Note! The test is active until the ignition is switched off. Switch off the ignition before the vehicle is delivered to the customer.





Continue - Checking components

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Checking components
Check the engine oil level and quality. Check for contaminants in particular.
Check the engine oil pressure.
Remove the camshaft reset valve. Check the oil ducts for the cylinder head for the camshaft reset valve (exhaust) for blockages and dirt.

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

Remedy as necessary.
Try a new camshaft reset valve (exhaust) if the above remedy does not solve the fault.

Hint: The fault may also have been caused by an internal fault in the variable valve timing unit. The variable valve timing unit may be damaged if the above fault-tracing and corrective action do not remedy the fault.

Other information:
- Oil pressure test, B5254T7 Testing and Inspection
- VVT solenoid, B5254T7 Removal and Replacement
- VVT unit, B5254T7 Service and Repair





Continue - Verification

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Verification




Verification

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




- Start the engine
- Read off the camshaft opening angle and the camshaft opening angle, desired value
- Active the quick test of camshaft control by clicking the start button
- Increase the engine speed (RPM) to approximately 2500 rpm and keep the engine running at this speed.
When the engine speed (RPM) increases, the control module will start the quick test to guide the camshaft to the different target values.
During the quick test, check that the opening angle of the camshaft (actual value) corresponds to the desired camshaft opening angle (target value) to an accuracy of ±10°. If the values do not correspond to an accuracy of ±10°, the function is faulty.
Deviation between the values can be read off in the lower display.
Carry out the check for approximately 15 seconds at an engine speed (RPM) of 2500 rpm. When the desired value is stable once again, the test has been completed. To restart the test, let the engine return to idle speed, then increase the engine speed to approximately 2500 rpm again.

Note! The test is active until the ignition is switched off. Switch off the ignition before the car is delivered to the customer.





Is the function OK?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

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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 the status

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