Signal Too High

Signal too high

Checking fuel pump (FP) function




- Ignition on.
- Activate heater.
Check heater function according to Test driving of Additional heater/Parking heater Initial Inspection and Diagnostic Overview.





Does the heater function?

Yes - Intermittent fault

No - Checking component and cables

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Checking component and cables
Check cable between control module #13 and fuel pump (FP) terminal 2 for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
If no faults are found in the cable the fuel pump (FP) should be replaced.
Remedy as necessary.

Other information:
- To access the control module/connect breakout box see.
- To access/replace fuel pump (FP) see Replacing fuel pump Service and Repair.
- With ignition on and fuel pump (FP) connector disconnected the voltage between the fuel pump (FP) terminal 2 (engine control module (ECM) side) and ground should be 0 V.
- For other values, see Signal specification Additional heater 912-D/B Signal Specification Additional Heater 912-D/B.













Continue - Verification

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Verification




Verification

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








- Ignition off.
- Reinstall connectors, components etc.
- Ignition on.
- Activate heater.
Check heater function according to Test driving of Additional heater/Parking heater Initial Inspection and Diagnostic Overview.





Does the heater function?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

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Fault-tracing information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - Exit fault-tracing

No - Attempt New Test

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Attempt New Test - Checking fuel pump (FP) function

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Intermittent fault
Check cable between control module #13 and fuel pump (FP) terminal 2 for a short-circuit to supply voltage according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Remedy as necessary.

Other information:
- To access the control module/connect breakout box see.
- To access/replace fuel pump (FP) see Replacing fuel pump Service and Repair.
- With ignition on and fuel pump (FP) connector disconnected the voltage between the fuel pump (FP) terminal 2 (engine control module (ECM) side) and ground should be 0 V.
- For other values, see Signal specification Additional heater 912-D/B Signal Specification Additional Heater 912-D/B.













Continue - Fault-tracing information
DONE

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Fault-tracing information




Information

Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

Do you want to view the information again?

Yes - Attempt New Test

No - FAULT FOUND

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Attempt New Test - Checking fuel pump (FP) function

FAULT-TRACING FAILED - DONE

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