Faulty Signal

Faulty signal

Checking the function of the combustion fan




- Ignition on
- Activate the combustion fan.
Listen for a buzzing sound which indicates that the combustion fan is running.





Does the combustion fan function?

Yes - Intermittent fault

No - Checking the connectors

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Checking the connectors








- Ignition off
- Check the electrical terminals on the combustion fan and the control module connector. Check for contact resistance and oxidation and remedy.
Check for damage carefully
- Reinstall the components, reconnect the connectors etc.
- Ignition on
- Activate the combustion fan.
Listen for a buzzing sound which indicates that the combustion fan is running.
If the combustion fan now operates, the cause of the fault was loose connections in the connectors.

Other information:
- To access the control module or connect the breakout box, see Connecting the breakout box Connecting the Breakout Box
- To access the combustion fan, see Fuel injection nozzle / fan motor / pressure equalizer, replacing Fuel Injection Nozzle / Fan Motor / Pressure Equalizer, Replacing
- Checking wiring and terminals Checking Wiring And Terminals.





Does the combustion fan function?

Yes - Fault Found

No - Replacing the component

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Replacing the component




- Ignition off.
Try a new combustion fan. See Fuel injection nozzle / fan motor / pressure equalizer, replacing Fuel Injection Nozzle / Fan Motor / Pressure Equalizer, Replacing.


Continue - Verification

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Verification




Verification

Verification

Hint: After the repair it is necessary to check that the fault has been rectified.








- Ignition off.
- Connect connector, install components etc.
- Ignition on.
- Activate the heater fan.
Listen for a buzzing sound indicating that the heater fan is working.





Is the heater fan working?

Yes - VERIFIED

No - VERIFICATION FAILEDPAPER

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - Fault Found

PAPER - No 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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking the function of the combustion fan

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Intermittent fault




- Ignition off.
Check the electrical terminals on the combustion fan and the control module connector. Check for contact resistance and oxidation.

Other information:
- To access the control module or connect the breakout box, see Connecting the breakout box Connecting the Breakout Box
- To access the combustion fan, see Fuel injection nozzle / fan motor / pressure equalizer, replacing Fuel Injection Nozzle / Fan Motor / Pressure Equalizer, Replacing
- Checking wiring and terminals Checking Wiring And Terminals.






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 the function of the combustion fan

DONE - DONE

FAULT FOUND - Fault Found

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