Signal Too Low

Signal too low

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.





Continue - 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.
Adjust the camshaft settings. See: 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 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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