Signal Missing

Signal missing

Checking components and wiring

Caution! Do not apply rust solvent spray or grease to the heated oxygen sensor (HO2S) connector.

- Check the heated oxygen sensor (HO2S) connector. Check for contact resistance and oxidation.
Check the wiring for short-circuiting to each other.
Check between:
- Engine control module (ECM) #A92 (#B32) and lambda sond #2 (wiring for calibration current).
- Engine control module (ECM) #A68 (#B8) and lambda sond #6 (wiring for pump current).
Check the cable for an open-circuit.
Check between:
- Engine control module (ECM) #A91 (#B31) and lambda sond #5.
- Engine control module (ECM) #A92 (#B32) and lambda sond #2 (wiring for calibration current).
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.
- Test drive the vehicle and perform 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 dynamic for the front heated oxygen sensor (HO2S).
The value should be higher than 1.0.





Is the value 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 components and wiring

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