Faulty Signal

Faulty signal

Checking glow plug 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 the connectors

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Checking the connectors








- Ignition off.
- Remedy glow plug electrical terminal and control module connector for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check any damage etc.
- Reinstall components, reconnect connectors etc.
- Ignition on.
- Activate heater.
Check that the heater starts and runs.
If the heater works the cause of the fault has been loose connections in the connectors.

Other information:
- To access the control module/connect breakout box see.
- To access the glow plug see Replacing fuel injection nozzle, fan motor and nozzle pipe Service and Repair.





Does the heater function?

Yes - FAULT FOUND

No - Checking component and cables

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Checking component and cables
Check cable between control module #1 and glow plug terminal for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
If there is no fault in the cable the glow plug should be replaced.
Remedy as necessary.

Other information:
- To access the control module/connect breakout box see.
- To access the glow plug see Replacing fuel injection nozzle, fan motor and nozzle pipe Service and Repair.
- With ignition on and glow plug electrical terminal disconnected the voltage between glow plug electrical terminal (engine control module (ECM) side) and ground should be approximately 9 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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VERIFICATION FAILED - Fault-tracing information

VERIFIED - FAULT FOUND

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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 glow plug function

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Intermittent fault
Check control module connector and glow plug electrical terminal for loose connections according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults and contact resistance and oxidation according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check cable between control module #1 and glow plug electrical terminal for an intermittent open-circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults , an intermittent short-circuit to ground according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults and an intermittent 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 the glow plug see Replacing fuel injection nozzle, fan motor and nozzle pipe Service and Repair.
- With ignition on and glow plug electrical terminal disconnected the voltage between glow plug electrical terminal (engine control module (ECM) side) and ground should be approximately 9 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 glow plug function

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