Signal Too Low

Signal too low

Checking passenger compartment temperature sensor




- Ignition on.
- Read off the temperature in the passenger compartment.
Check that the temperature reading obtained is correct. Compare with the actual air temperature. If the diagnostic trouble code (DTC) stored is a permanent fault a substitute value of approximately 22°C (71.6°F) will be displayed.





Is the temperature reading OK?

Yes - Intermittent fault

No - Checking components and cables

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Checking components and cables
Check passenger compartment temperature sensor resistance. For resistance values, see ECC electrical specifications [1][2]Electrical Specifications.
Check cable between ECC control module #B6 and passenger compartment temperature sensor terminal 5 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.

Other information:
- To access/replace the passenger compartment temperature sensor, see Replacing passenger compartment temperature sensor (ECC) Removal and Replacement.
- To remove the control module, refer to Replacing ECC control module Removal and Replacement.
- To connect the breakout box, see Connection of breakout box ECC Connection of Breakout Box ECC.
- The voltage on the signal cable varies with temperature. At 20 °C (68°F) voltage should be approximately 2.5 V. For other values, see Signal specification ECC Signal Specification ECC.














Continue - Verification
DONE

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Verification




Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off.
- Reinstall connectors, components etc.
- Ignition on.
- Read off the temperature in the passenger compartment.
Check that the temperature reading obtained is correct. Compare with the actual air temperature. If the diagnostic trouble code (DTC) stored is a permanent fault a substitute value of approximately 22°C (71.6°F) will be displayed.





Is the temperature reading OK?

Yes - VERIFIED

No - VERIFICATION FAILED

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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 - Exit fault-tracing

No - Attempt New Test

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Attempt New Test - Checking passenger compartment temperature sensor

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Intermittent fault
Check cable between ECC control module #B6 and passenger compartment temperature sensor terminal 5 for an intermittent short-circuit to ground according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Remedy as necessary.

Other information:
- To remove the control module, refer to Replacing ECC control module Removal and Replacement.
- To access/replace the outer temperature sensor, refer to Replacing outside temperature sensor (Electronic climate control) Removal and Replacement.
- To connect the breakout box, see Connection of breakout box ECC Connection of Breakout Box ECC.
- The voltage on the signal cable varies with temperature. At 20 °C (68°F) voltage should be approximately 2.5 V. For other values, see Signal specification ECC Signal Specification ECC.














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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Attempt New Test - Checking passenger compartment temperature sensor

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