Fault-Tracing Information

ECC-121, 135, 137, 211 and 221

Short-circuit to ground





Short-circuit to ground

Checking for a short-circuit








- If the diagnostic trouble codes (DTCs) are stored simultaneously, there is a short-circuit to ground in a reference cable for ECC control module connector terminal 6, 14, 16 or 22.
- Ignition off.
- Disconnect the ECC control module.
Check the following cables for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault :
- from ground (0 V) to ECC control module connector terminal 6 (the potentiometer for the air distribution damper motor).
- from ground (0 V) to ECC control module connector terminal 14 (outside temperature sensor).
- from ground (0 V) to ECC control module connector terminal 16 (coolant temperature sensor).
- from ground (0 V) to ECC control module connector terminal 22 (the junction point for the evaporator sensor and the potentiometer for the temperature damper motor).









Continue - Verification

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Verification




Verification

Hint: Check after repair that the fault has been rectified.












- Ignition off.
- Connect the connectors, reinstall components etc.
- ECC control module connected.
- Ignition on.
- VCT 2000 connected to data link connector (DLC).
Establish communication with the ECC system.





Continue - Verification, continued

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Verification, continued
Read off diagnostic trouble codes (DTCs).





Continue - Verification, continued

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Verification, continued
Erase the diagnostic trouble codes (DTCs).





Continue - Verification, continued

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Verification, continued
Check that diagnostic trouble codes (DTCs) do not recur.





Do the diagnostic trouble codes (DTCs) recur?

Yes - VERIFICATION FAILED

No - VERIFIED

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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 for a short-circuit

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