Signal Too High
Signal too high
Checking the function of the water pump
- Ignition on.
- Activate the combustion fan.
Listen for a buzzing sound which indicates that the combustion fan is running.
Is the combustion fan working?
Yes - Checking components and wiring
No - Checking components and wiring
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Verification
Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off
- Reinstall the connectors, components etc.
- Ignition on
- Activate the combustion fan.
Listen for a buzzing sound which indicates that the combustion fan is running.
Is the combustion fan working?
Yes - VERIFIED
No - VERIFICATION FAILEDPAPER
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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 - 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 water pump
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Checking components and wiring
Check the cable between combustion preheater module (CPM) terminal #10 and the signal terminal for the combustion fan (the black lead from the fan). Check for a short-circuit to supply voltage.
The combustion fan must be replaced if no faults are found in the cable.
Remedy as necessary.
Other information
- Connecting the breakout box Connecting the Breakout Box
- Signal specification Signal Specification
- 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 - Verification
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Checking components and wiring
Check the cable between combustion preheater module (CPM) terminal #10 and the signal terminal for the combustion fan (the black lead from the fan). Check for an intermittent short-circuit to supply voltage.
Remedy as necessary.
Other information
- 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
- Signal specification Signal Specification
- Water pump engine coolant heater, replacing Service and Repair
- Checking wiring and terminals Checking Wiring And Terminals
Continue - Verification
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