DTC 68

DTC 68 Chart:

A/C Circuit:

Circuit Description:
When the PCM detects that A/C has been requested, the PCM will activate the A/C clutch relay. When the relay is activated, voltage should be present at both the A/C compressor clutch and the A/C status terminal at the PCM.

If the PCM detects voltage on the A/C status terminal when the A/C relay has not been commanded "ON" by the PCM, a DTC 68 will set.

A short to voltage at any point on CKT 59, a grounded relay control circuit or stuck A/C relay contacts can set a DTC 68.

A DTC 68 fault will be stored in PCM memory but will not turn "ON" the Malfunction Indicator Lamp (MIL) "Service Engine Soon."

DTC 68 Will Set When:
The PCM detects voltage on CKT 59 for more than 10 seconds after the PCM has disengaged the A/C relay.

Action Taken (PCM will default to):
The MIL will not become illuminated, the A/C compressor will be disabled, the cooling fan will not be enabled unless A/C had been requested first and the vehicle speed is above 35 mph with as current DTC 68.

DTC 68 Will Clear When:
A current DTC 68 will clear when the PCM no longer detects voltage on CKT 59 when the A/C relay has not been commanded "ON" by the PCM. A history DTC 68 will clear after 50 consecutive ignition key cycles without a current DTC 68 being stored

Test Description: Number(s) below refer to circled number(s) on the diagnostic chart.

1. This step is to determine if voltage is detected on the A/C status line after the PCM has disengaged the A/C relay.

2. This will isolate the ignition feed portion of the circuit from the clutch circuit.

3. If DTC 68 reappears at this step, the PCM is internally shorted to voltage.

Diagnostic Aids:
Check for intermittent shorts to A/C clutch circuit or sticking A/C relay.