Activated Too Long

Activated too long

Checking the intake air flow




- Ignition off
- Disconnect the heater.
Check that the air flow through the heater is free (that the air intake and exhaust are not blocked).
Also check that the flame sensor is not clogged with soot or damaged.
Remedy as necessary.

Continue - Checking the component

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Checking the component








- Ignition on
- Read off the temperature on the flame sensor
- Ignition off
- Disconnect the connector in the heater.
Measure the resistance of the flame sensor and compare with the value in the component specification.
Remedy as necessary.

Other information
- Component specification [1][2]Auxiliary Cabin Heater
- Flame sensor engine coolant heater, replacing Flame Sensor Engine Coolant Heater, 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.
Erase diagnostic trouble codes (DTCs).

Note! Diagnostic trouble codes (DTCs) must be erased to start the heater. Before erasing diagnostic trouble codes (DTCs) all indicated faults must be corrected.





Continue - continued

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Verification, continued








- Ignition off
- Reinstall the connectors, components etc.
- Ignition on.

Note! It is important that only the ignition is on in order for the heater to start.

- Activate the heater.
On activation of the heater sequence, the heater starts up and operates for approximately 2 min 30 s. A buzzing sound must be heard from the heater.
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.

Other information
- Description of parameters Description of Parameters
- Description of activations Description of Activations
- Fuel-powered preheater, checking Fuel-Powered Preheater, Checking





Is the heater working?

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 intake air flow

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