Signal Too Low

Signal too low

Checking components and wiring
Check the pump motor's resistance between the leakage diagnostic unit's connector #1 and #4 (against the leakage diagnostics pump).
Check the signal cable. Check for a short-circuit to ground.
Take readings between:
- Engine Control Module (ECM) #B23 (#C23) and leakage diagnostic unit #1.
Try a new leakage diagnostics unit if no defect is found during the above troubleshooting.
Remedy as necessary.

Other information
- Connecting the breakout box, B5254T7 Connecting the Breakout Box, Engine Control Module (ECM)
- Signal specification, B5254T7 Signal Specification
- Leak diagnostic pump, B5254T7, AW55-50/51SN, B5254T7, M66 Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals









Continue - Troubleshooting information

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Troubleshooting information




Information

Fault-tracing information
Fault-tracing is not followed by verification for this fault.

Hint: After the diagnostic trouble codes (DTCs) are erased, the function of the leak diagnostic unit can be checked by running a quick test of the fuel tank system in the vehicle communication socket. If there is a fault, the fault status will be "FAULT FOUND" on the leak diagnostic unit.

The information can be displayed again or fault-tracing this fault can be interrupted.

Do you want to view the information again?

Yes - Attempt New Test

No - FAULT FOUND

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Attempt New Test - Checking components and wiring

FAULT FOUND - DONE

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