Signal Too High

Signal too high

Checking the status

Hint: This diagnostic trouble code (DTC) can be stored for faults that are detected by the central electronic module (CEM).

Note! If there are diagnostic trouble codes (DTC) for the fuel pump (FP) or the relay for the fuel pump stored in the central electronic module (CEM), these must be fault traced accordingly.




- Ignition on.
Check whether the fault is permanent or intermittent. Read off the diagnostic trouble code (DTC) fault status when the diagnostic status is "Completed".
The fault is permanent if the fault status is "Fault found". The fault is intermittent if the fault status is "No fault detected".









Continue - Checking the component and wiring

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Checking the component and wiring




- Start the engine and run it to normal operating temperature.
Read off the fuel pump (FP) load (signal from the engine control module (ECM) to the fuel pump (FP) control module).
Check that the signal is approximately 50% (±10 %) with the engine idling at operating temperature.
Check the cable between engine control module (ECM) terminal #B20 (#C20) and fuel pump (FP) module terminal #1. Check for a short-circuit to supply voltage.
Remedy as necessary.

Other information
- Connecting the breakout box Connecting The Breakout Box, Engine Control Module (ECM)
- Signal specification Signal Specification, Engine Control Module (ECM)
- Fuel pump driver module 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.








- Reinstall the connectors, components etc.
- Start the engine and run it to normal operating temperature.
Read off the fuel pump (FP) load (signal from the engine control module (ECM) to the fuel pump (FP) control module).
Check that the signal is approximately 50% (±10 %) with the engine idling at operating temperature.









Is the signal within its permitted range?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - FAULT FOUND

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Fault-tracing information

FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking the status

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