Signal Too Low

Signal too low

Checking the components and wiring
Check the cable for short-circuit to ground.
Take readings between:
- Engine control module (ECM) #A90 (#B30) and lambda sond #4.
- Engine control module (ECM) #A95 (#B35) and lambda sond #3.
Try a new heated oxygen sensor (HO2S) if the above fault-tracing does not remedy the fault.
Remedy as necessary.

Other information
- Connecting the breakout box, B5254T7 Connecting the Breakout Box, Engine Control Module (ECM)
- Signal specification, B5254T7 Signal Specification
- Checking wiring and terminals Checking Wiring and Terminals













Continue - Verification

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Verification




Verification

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








- Ignition off
- Reconnect the connectors, reinstall components etc.
- Start the engine and run it until the engine coolant temperature exceeds 60 °C
- Switch off the engine and allow it to cool (below 40 °C)
- Test drive the car on the road (engine speed (RPM) above 2000 rpm, never idling) for at least 15 minutes
- 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

Attempt New Test - Checking the components and wiring

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