Overheated

Over heated

Checking the water pump




- Ignition on.
Activate the water pump.
There must be a buzzing sound from the water pump when it is activated.
The fault is permanent if the water pump does not start.
If the water pump starts, this is an indication that the fault was present previously but that it is not active at the moment, i.e. the fault is intermittent.
Remedy as necessary.

Other information
- Water pump engine coolant heater, replacing Water Pump Engine Coolant Heater, Replacing.





Continue - Checking the cooling system

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Checking the cooling system




- Ignition on.
Activate the water pump.
Check the hoses in the coolant system. Check for damage and leakage.
Remedy as necessary.





Was a fault detected?

Yes - Verification

No - Reading off parameters

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Reading off parameters




- Ignition on.
Read off the temperature of the overheat protection thermostat and the engine coolant temperature (ECT) sensor.
Note the values for resistance measurement.





Continue - Checking the component

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Checking the component








- Ignition off
- Disconnect the connector in the heater.
Measure the resistance of the overheat protection thermostat and the engine coolant temperature (ECT) sensor. Compare with the resistance value in the component specification.
Remedy as necessary.

Other information
- Component specification [1][2]Auxiliary Cabin Heater
- Overheat protection thermostat/engine coolant temperature sensor, replacing Overheat Protection Thermostat/Engine Coolant Temperature Sensor, Replacing





Continue - Verification

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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 heater.
On activation of the heater sequence, the heater starts up and operates for approximately 2 min 30 s.
Do not interrupt the heater sequence. The heater is switched off automatically after approximately 2 min 30 s.
When the heater sequence is completed the read out of whether or not flames were detected can be made.
Check that the heater starts and is working correctly.

Other information
- Fuel-powered preheater, checking Fuel-Powered Preheater, Checking





Is the function OK?

Yes - Troubleshooting procedure complete

No - 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 the cooling system

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