Flow of Diagnosis

1. Verify customer concern by performing a complete operational test of the speed control system to duplicate original symptom.

WARNING: IF THE SPEED CONTROL SYSTEM GOES OUT OF CONTROL OR OVERSPEEDS DURING THE ROAD TEST, BE PREPARED TO TURN OFF THE SYSTEM USING THE SPEED CONTROL ACTUATOR SWITCH (CRUISE CONT. OFF) OR THE IGNITION SWITCH.

2. Visually inspect the following components of the speed control system:

VISUAL INSPECTION CHART

Mechanical
- Vacuum leaks at speed control actuator cable
- Incorrect speed control actuator adjustment
- Damaged or binding speed control actuator cable
- Damaged or misadjusted brake pedal
- Damaged or misadjusted Transmission Range (TR) switch

Electrical
- Blown fuse:
- 1OA RELAYS
- 10A ELECTRON
- 15A HORN
- Loose or corroded connections
- Damaged wiring harness
- Damaged, broken or improperly adjusted switch(es)
- Damaged or corroded relay(s)
- Damaged speed control

3. Depress and release the accelerator pedal. Check the accelerator cable and the speed control actuator cable for freedom and proper adjustment.
4. Check the vacuum hose at the speed control actuator cable for cracks, kinks, and/or blockage.
5. Check the wiring harness for obvious signs of shorts, opens, bad connections, or damage.
6. Verify that the speedometer, horn, and stoplamps function properly.
- The speedometer, horn and/or stoplamps must be functioning before proceding with diagnosis of the speed control system.