Checking the Flame Sensor

Checking the flame sensor

Checking the operating status




- Ignition on.
- Start the heater.
Read off the operating status and temperature of the heater.

Hint: The flame sensor should register the flame. If the temperature increases, even though status 3 is not obtained, the fault may be due to an open-circuit in the cable or the flame sensor may be blocked.

Check the cable between terminal #8 on the control module and the flame sensor for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- For other values, see Signal specification Signal Specification.






Continue - Verification

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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.





Numeric Result 0 - continued

Numeric Result 25456 - 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.
A buzzing sound should be heard from the heater.

Hint: After repair, the voltage of the flame sensor can be checked. The voltage should be a maximum of 1.0 V.

Check the function of the heater. See Engine coolant heater, test running Engine Coolant Heater, Test Running.

Other information:
- For a description of parameters, see Description of parameters Description of Parameters
- For a description of activations, see Activating components/functions Activating Components/Functions.





Does the heater operate?

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 operating status

FAULT FOUND - Fault Found

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