Signal Too High
Signal too high
Checking the status
- Start the engine
- Read off the engine coolant temperature (ECT)
- Start the quick test for adaptation of the camshaft when the engine coolant temperature is between 60 °C and 100 °C
- Increase the engine speed to at least 2000 rpm
- Check that the quick test starts. The quick test has started when "Adaptation camshaft" changes status from "Not in operation" to "In operation".
Hint: In some cases the quick test can be carried out extremely quickly. Check the status in the graphic display if in doubt.
- The quick test has been carried out when "Adaptation camshaft" is back in "Not in operation".
- The engine must be at idle speed when the quick test is carried out.
Check the value of the camshaft discrepancy (adaptation camshaft) when the quick test has been carried out. The value must be between -8° and +8°.
If the value is correct (between -8° and +8°) the fault is intermittent. If the value is incorrect (lower than -8° or higher than +8°), the fault is permanent.
Is the value correct?
Yes - Intermittent fault
No - Checking components
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Checking components
For variable valve timing control to operate correctly the engine oil must be at the correct level, of the correct quality and not contaminated.
Check the engine oil level and quality. Check for contaminants in particular.
If the value is too high (higher than +8°) when the engine is at operating temperature, the cause of the fault is probably one of the following:
- Camshaft belt incorrectly seated
- Incorrect basic setting for the timing belt
- Faulty camshaft reset valve (the slide in the valve has stuck).
Hint: First try adjusting the basic setting of the camshaft. Then read off the camshaft discrepancy at idle speed after carrying out the quick test. The value must be between -8° and +8°. If the value is incorrect when the basic setting of the camshaft is correct, try cleaning the camshaft reset valve.
Try a new camshaft reset valve if the above fault-tracing does not solve the fault.
Remedy as necessary.
Hint: The fault can also be caused by a damaged 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
- To adjust the camshaft position (CMP), see VVT unit, B5254T7 Service and Repair
- VVT solenoid, B5254T7 Removal and Replacement
Continue - Verification
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Intermittent fault
If the diagnostic trouble code (DTC) for this fault is stored but the value is correct, the fault is intermittent. The cause of the intermittent fault is probably a damaged camshaft reset valve.
VVT solenoid, B5254T7 Removal and Replacement
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 engine coolant temperature (ECT)
- Start the quick test for adaptation of the camshaft when the engine coolant temperature is between 60 °C and 100 °C.
- Increase the engine speed to at least 2000 rpm
- Check that the quick test starts. The quick test has started when "Adaptation camshaft" changes status from "Not in operation" to "In operation".
Hint: In some cases the quick test can be carried out extremely quickly. Check the status in the graphic display if in doubt.
- The quick test has been carried out when "Adaptation camshaft" is back in "Not in operation".
- The engine must be at idle speed when the quick test is carried out.
Check the value of the camshaft discrepancy (adaptation camshaft) when the quick test has been carried out. The value must be between -8° and +8°.
Is the function OK?
Yes - VERIFIED
No - VERIFICATION FAILED
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VERIFICATION FAILED - Fault-tracing information
VERIFIED - FAULT FOUND
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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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