DTC 68

DTC 68 Chart A/C Relay Circuit:

A/C Relay Wiring Diagram:

Circuit Description:

When the ECM detects that A/C has been requested, the ECM 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 ECM.

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

A short to voltage at any point in CKT 59 or CKT 603, a grounded relay control circuit or stuck A/C relay contacts can set a DTC 68.

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

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

1. DTC 68 will set if:

^ Voltage is detected on the A/C status line for more than 20 seconds after the ECM 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 ECM is internally shorted to voltage.

Diagnostic Aids:


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