Fault-Tracing Information

Fault-tracing

Checking the status




- Ignition on
Check whether the fault is permanent or intermittent by reading off the mass air flow (MAF) sensor signal. Check that the signal is approximately 5-6 g/s with the engine idling at operating temperature.





Continue - Checking components and wiring

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Checking components and wiring








- Ignition off
- Disconnect the engine control module (ECM).
Check the signal cable. Check for a short-circuit to ground. Check the signal cable with regard to open circuit.
Take readings between control module terminal #A70 (#B10) and mass air flow (MAF) sensor terminal #3.
Remedy as necessary.

Other information
- Connecting the breakout box, B6304T4 Connecting the Breakout Box, Engine Control Module (ECM)
- Signal specification, B6304T4 Signal Specification, Engine Control Module (ECM)
- Mass air flow (MAF) sensor, B6304T4 Service and Repair
- 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
- Reinstall the connectors, components etc.
- Start and run the engine to operating temperature.
Read off the mass air flow (MAF) sensor signal by clicking on the VCT2000 symbol. Check that the signal is approximately 5-6 g/s with the engine idling at operating temperature.
Check that the signal from the mass air flow (MAF) sensor is correct.





Is the signal correct?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

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Fault-tracing information

Attempt New Test - Checking components and wiring

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