Signal Too Low:

Signal too low:

Checking fan motor passenger compartment temperature sensor




- Ignition off.
- Remove passenger compartment temperature sensor according to Replacing passenger compartment temperature sensor (ECC) Removal and Replacement. Leave the sensor connected.
- Ignition on.
- Start blower fan on manual speed, the blower fan sensor fan motor should start.
Check that fan motor in the temperature sensor is operating.





Is the fan working?

Yes - Intermittent fault.

No - Checking components and cables

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Checking components and cables
Check cable between ECC control module #B8 and passenger compartment temperature sensor terminal 4 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check that the fan motor is OK, the fan turns easily and the motor is not short-circuited internally.
Remedy as necessary.

Other information:
- To remove the control module, refer to Replacing ECC control module Removal and Replacement.
- To access/replace the passenger compartment temperature sensor, refer to Replacing passenger compartment temperature sensor (ECC) Removal and Replacement.
- Breakout box connection, refer to Connection of breakout box ECC Connection of Breakout Box ECC.
- Voltage on the control signal lead should be battery voltage approximately when the fan is activated. For other values, refer to 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
- Reconnect connectors, reinstall components. Leave the temperature sensor loose but connected to the system.
- Ignition on.
- Start blower fan on manual speed, the sensor fan motor should start.
Check that the fan motor in the passenger compartment temperature sensor is operating.





Is the fan working?

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 fan motor passenger compartment temperature sensor

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Intermittent fault.
Check cable between ECC control module #B8 and temperature sensor terminal 4 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 passenger compartment temperature sensor, refer to Replacing passenger compartment temperature sensor (ECC) Removal and Replacement.
- Breakout box connection, refer to Connection of breakout box ECC Connection of Breakout Box ECC.
- Voltage on the control signal lead should be battery voltage approximately when the fan is activated. For other values, refer to 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 fan motor passenger compartment temperature sensor

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