Diagnostic Trouble Code (DTC) Information

Condition

The control module is continuously supplied with information about current outdoor temperature from Engine control module (ECM) via CAN-communication. The control module checks the quality of the information from the Engine control module (ECM).

The diagnostic trouble code (DTC) is stored if the control module detects that:

Transmitting control module indicates a lower quality level of the information (signal) than that which the Climate control module (CCM) accepts.

The control module's test for the diagnostic trouble code (DTC) starts in the event of:

Engine running.

NOTE:

The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Fig 1: Identifying Climate Control Unit

Courtesy of VOLVO CARS CORPORATION

Substitute Value

None.

Possible Source

Locate the cause of the fault in the engine control module (ECM).

Fault symptom[s]

Temperature control/A/C does not work