Chart C-17 Cruise Control System Check

Cruise Control System Circuit:

Chart C-17 Diagnostic Chart:

Circuit Description:
Cruise control operation is one of the functions which is PCM controlled. The PCM receives input signals from the C/C engagement switches, the brake switch, the vehicle speed sensor, the TPS and the servo position sensor. The PCM processes these inputs and sends output signals to the servo to open or close its Vent and Vac solenoid valves to control vehicle speed.

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

If one or more of the following trouble codes are stored, cruise control may be disabled. Repair any codes before diagnosing the cruise control system.

* DTC 16
* DTC 21
* DTC 22
* DTC 24
DTC 36
DTC 38
DTC 61
DTC 62
DTC 65
DTC 68
DTC 68

* "SES" light is turned "ON" when this code is detected.