Faulty Signal

Faulty signal

Checking function of power unit




- Ignition on.
- Select a Manual control setting on the blower fan switch.
- Read off status of power unit communication.
Check that communication is working correctly.
If communication is OK then the status will be OK, if it is not OK then the status reading will be NOT OK





Is communication OK?

Yes - Intermittent fault

No - Checking connectors

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Checking connectors








- Ignition off.
- Check and remedy the ECC control module and power unit connectors for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check any damage etc.
- To remove the control module, see Replacing ECC control module Removal and Replacement.
- To access the power unit, refer to Replacing the power unit (Electronic climate control) Replacing the Power Unit (Electronic Climate Control).
- Reinstall components, reconnect connectors etc.
- Ignition on.
- Select a Manual control setting on the blower fan switch.
- Read off status of power unit communication.
Check that communication is working correctly.
If communication is OK then the status will be OK, if it is not OK then the status reading will be NOT OK
If communication is now OK this indicates that the fault was caused by in poor contact in the connectors.





Is communication OK?

Yes - FAULT FOUND

No - Checking cables

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Checking cables
Check cable between ECC control module #A14 and power unit terminal #A2 for an open circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
If cables are OK, try a new power unit.
Remedy as necessary.

Other information
- To access/replace the blower power unit, refer to Replacing the power unit (Electronic climate control) Replacing the Power Unit (Electronic Climate Control).
- Connection of breakout box to ECC control module, refer to Connection of breakout box ECC Connection of Breakout Box ECC.
- The voltage on the signal cable varies between approximately 0.22-2.5 V. For other values, see Signal specification ECC Signal Specification ECC.














Continue - Verification
DONE

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Verification

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








- Ignition off.
- Reinstall connectors, components etc.
- Ignition on.
- Read off status of power unit communication.
Check that communication is working correctly.
If communication is OK then the status will be OK, if it is not OK then the status reading will be NOT OK





Is communication OK?

Yes - FAULT FOUND

No - Fault-tracing information
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 - Exit fault-tracing

No - Attempt New Test

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Attempt New Test - Checking function of power unit

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Intermittent fault
Check the ECC control module and power unit connectors for contact resistance and oxidation according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check cable between ECC control module #A14 and power unit terminal #A2 for an open-circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults and 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 power unit, refer to Replacing the power unit (Electronic climate control) Replacing the Power Unit (Electronic Climate Control).
- Connection of breakout box to ECC control module, refer to Connection of breakout box ECC Connection of Breakout Box ECC.
- The voltage on the signal cable varies between approximately - 0.22-2.5 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 function of power unit

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