Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information CCM-0002

Condition




The diagnostic trouble code (DTC) is stored if the climate control module (CCM) detects a short-circuit to supply voltage in the signal, or an open-circuit in the signal between the control module and the evaporator temperature sensor.
The climate control module (CCM) uses the signal to control the A/C compressor.
At temperatures below 6 °C the compressor is not permitted to operate because of the risk of freezing.
In normal operation (engine running and A/C selected) the control module can regulate the compressor in the following way based on the evaporator temperature:
- 10 °C air conditioning (A/C) compressor on
- 6.5 °C air conditioning (A/C) compressor off.
The diagnostic trouble code (DTC) can be detected at key positions 1 and 2 (not key position 3).

Substitute value
- The control module assumes a replacement value equivalent to 0 °C. The compressor will not then be permitted to operate
- The normal value during operation (engine running and A/C selected) is 6.5-10 °C. If the climate control system has not been operating and the engine has cooled, the temperature must correspond to the ambient temperature.

Possible source
- There is a short-circuit to supply voltage in the signal between the evaporator temperature sensor and the climate control module (CCM)
- Open-circuit in the signal between the evaporator temperature sensor and the climate control module (CCM)
- Contact resistance, oxidation or loose connections in the connectors
- The evaporator temperature sensor does not function.

Fault symptom[s]
- No cooling from the air conditioning (A/C) system.
- Irregular cooling from the air conditioning (A/C) system.
- The air conditioning (A/C) compressor does not start, or runs sporadically.