Faulty
Faulty
Checking the power supply
- Ignition on
- Connect a voltmeter between terminals #11 and #3 on the breakout box.
The voltmeter should read approximately 0 V.
Does the voltmeter read approximately 0V?
Yes - Intermittent fault
No - Checking the supply circuit
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Checking the supply circuit
- Ignition off
- Remove the heater.
Check the circuit between combustion preheater module (CPM) terminal #11 and the components which are connected to the supply circuit (water pump terminal 2, fuel pump (FP) terminal 2 and combustion fan supply terminal). Check for a short-circuit to supply voltage.
With the ignition on and the water pump connector disconnected, the voltage between water pump terminal 1 (control module side) and ground should be approximately 0 V.
Remedy as necessary.
Other information:
- Connecting the breakout box Connecting the Breakout Box
- Signal specification Signal Specification
- Engine coolant heater, replacing Engine Coolant Heater, Replacing
- Water pump engine coolant heater, replacing Service and Repair
- Fuel pump auxiliary heater, replacing Service and Repair
- 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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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
- Read off the engine coolant temperature.
Note! It is important that only the ignition is on in order for the heater to start.
- Activate the heater.
Hint: After repair, the voltage of the flame sensor can be checked. The voltage must be a maximum of 1.0 V.
Check the heater function.
Caution! In order for to enable start of the heater itself, the battery voltage must be normal, coolant temperature must be lower than +96 °C and the heater's after-run/stop sequence must be finished. There must also be enough fuel in the tank.
Caution! If the heater or other components are not activated, try closing down the activation window and then starting the activation again with the symbol for VCT2000.
Other information:
- Engine coolant heater, test running Component Tests and General Diagnostics.
Is the heater working?
Yes - VERIFIED
No - VERIFICATION FAILEDPAPER
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VERIFIED - Fault Found
VERIFICATION FAILED - Fault-tracing information
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 - Connecting the breakout box
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Intermittent fault
Check the circuit between combustion preheater module (CPM) terminal #11 and the components which are connected to the supply circuit (water pump terminal 2, fuel pump (FP) terminal 1 and combustion fan supply terminal). Check for an intermittent short-circuit to supply voltage.
With the ignition on and the water pump connector disconnected, the voltage between water pump terminal 1 (control module side) and ground should be approximately 0 V.
Remedy as necessary.
Other information:
- Connecting the breakout box Connecting the Breakout Box
- Signal specification Signal Specification
- Water pump engine coolant heater, replacing Service and Repair
- Fuel pump auxiliary heater, replacing Service and Repair
- 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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FAULT-TRACING FAILED - DONE
FAULT FOUND - Fault Found
Attempt New Test - Connecting the breakout box
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