The recommended method for reading DTC(s) stored in the electronic climate control (ECC) modules memory is by using a scan tool plugged into the DLC connector (located under the instrument panel on the right side). Follow the scan tool instructions supplied by the tool manufacturer. The DTC(s) will be stored in the memory of the electronic climate control module as a Current or a History DTC.

The ECC module will set the code as a current DTC under the following conditions:

All DTC(s) remain current until the following conditions exist:

The Current code then will become a History code only when the above conditions exist.

When a DTC reports a failure and the failure was not in the current ignition cycle, the DTC will be stored as a history code. The ECC module performs internal diagnostic tests in order to acknowledge that the related systems have reported a pass or fail condition. Each diagnostic test that fails is recorded in the ECC module memory. The ECC module memory may be accessed with a scan tool in order to determine which DTC circuit was at fault. A history DTC may be cleared (for any diagnostic test) by performing any of the following procedures:

After diagnosing a problem, in addition to repairing the discovered malfunction, clear any DTC(s) set and verify proper operation. In order to verify proper operation, you must duplicate the conditions when the customer's complaint occurred. If a DTC was set, you must duplicate the test conditions for that DTC (listed on the Diagnostic Trouble Code table). The DTC should not re-set after the repair has been completed.