Diagnostic trouble code (DTC) information CCM-0003

Condition 

The diagnostic trouble code (DTC) is stored if the climate control module (CCM) detects a short-circuit to ground in the signal between the climate control module (CCM) and the evaporator temperature sensor.

The climate control module (CCM) uses the signal to control the A/C compressor.

At temperatures below 5.5 °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
• 5.5 °C air conditioning (A/C) compressor off.

The diagnostic trouble code (DTC) can be diagnosed in ignition positions I and II.

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 5.5-10 °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 ground in the signal between the evaporator temperature sensor and the climate control module (CCM)
• 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.