DTC 68

Diagnostic Trouble Code (DTC) 68:

A/C Relay Circuit.:

CIRCUIT DESCRIPTION
When the Powertrain Control Module (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 clutch status terminal at the PCM.

If the PCM detects voltage on the A/C clutch status terminal when the A/C has not been requested a DTC 68 will set.
A short to voltage at any point in CKT 59, a grounded relay control circuit or stuck A/C relay contacts can set a DTC 68.

DTC 68 WILL SET WHEN:
Voltage is detected on the A/C status line for more than 25 seconds after the PCM has disengaged the A/C relay.

ACTION TAKEN (PCM will default to):
DTC 68 will be stored in the PCM memory but will not turn "ON" the Malfunction Indicator Light (MIL), A/C operation will be disabled.

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.

1. A/C must be "OFF" while performing test.
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
Inspect the harness and all related connectors including the PCM connectors. These may cause an intermittent. Check for damaged or pushed out terminals.