DTC 67

DTC 67 Chart:

Cruise Control System Circuit:

CIRCUIT DESCRIPTION
CKT 439 is controlled by the ignition switch and protected by a 10 amp fuse. It provides system voltage to the cruise control switches and cruise brake switch as well as other circuits.

DTC 67 WILL SET WHEN
- CKT 397 ("ON/OFF" switch) is open between cruise engage switch and the PCM.
- CKT 84 (set/coast switch) is indicated "ON" for over 10 minutes (switch problem).
- CKT 87 (resume/accel switch) is indicated "ON" for over 10 minutes (switch problem).
- CKT 86 is open to the PCM (no change in the status of the cruise brake switch) when the vehicle makes 5 stops from 35 mph (for more than 10 seconds) down to 0 mph.
- Any of the above circuits are shorted to voltage.
- One of the above conditions are met.

ACTION TAKEN (PCM WILL DEFAULT TO)
The PCM will not allow cruise control operation with a current DTC 67 set. DTC 67 does not illuminate the Malfunction Indicator Lamp (MIL) (Service Engine Soon).

NOTE: A short to ground in CKTs 397, 84, 86 or 87 will cause a failure of the cruise engagement switch. It will not blow the 10 amp fuse for CKT 439.

DTC 67 WILL CLEAR WHEN
The fault no longer exists and the ignition switch is cycled "OFF" and "ON."

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

1. Checks the function of the "ON" portion of the cruise control switch.
2. Checks the function of the "OFF" portion of the cruise control switch.
3. Checks for a poor connection at the PCM or a or a faulty PCM.
4. Checks the cruise control brake switch input.
5. Checks for a short to voltage on CKT 397, a faulty signal control lever or faulty PCM.
6. Checks the function of the SET/COAST and RES/ACCEL switches.
7. Checks for an open CKT 86/397, poor PCM connection or faulty PCM.
8. Checks for a short to B+ on CKT 84 or 87, turn signal control lever or fault PCM.

DIAGNOSTIC AIDS
An intermittent may be caused by a poor connection, rubbed through wire insulation, or a wire broken inside the insulation.
Check for:

Poor connection or damaged harness
Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wire connection, and damaged harness.