Signal Too High

Signal too high

Checking the components and wiring
Check the intake system for air leakage.
Check the exhaust system for air leakage.
Checking fuel and residual pressure.
Check the compression of the engine.
Remedy as necessary.

Note! Try a new heated oxygen sensor (HO2S) if the above fault-tracing does not remedy the fault.

Other information
- Check for air leaks in the intake system Air Leaks in the Intake System, Checking
- Checking for air leakage in the exhaust system Air Leakage Exhaust System, Check
- Cylinder leakage test Component Tests and General Diagnostics
- Three-way catalytic converter (TWC), replacing Service and Repair






Continue - Verification

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Verification




Verification

Verification

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








- Ignition off
- Reconnect the connectors, reinstall components etc.
- Test drive the vehicle on the road. Run a TRIP schedule so that the engine control module (ECM) compares the diagnostics. To run a TRIP schedule, see: Verifying repairs Verifying Repairs
- Connect VCT2000 to the data link connector (DLC) without switching off the engine.

Note! If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated.

Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list.
Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.





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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking the components and wiring

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