Flow of Diagnosis

Visual inspection is an important part of diagnosis. The inspection should be done to locate obvious reasons for customer concern.

When carrying out visual inspection, check all items for abnormal conditions. Look for such items as bare, broken or disconnected wires. For the speed control to function properly, the speed control servo (throttle actuator) and throttle linkage should operate freely and smoothly.

Any concerns found by the visual inspection should be corrected before further tests of the speed control system are made. The following items should be inspected.
- If the yellow ABS indicator in the instrument cluster stays illuminated when the ignition switch is in the RUN position, refer to Anti-Lock Brake System before continuing with the speed control diagnostics.
- Does the horn operate? If not, refer to Horn.
- Check the Central Junction Box (CJB) Fuse 9 (7.5 A), 10 (7.5A), and 13 (20 A).

Check for unseated connectors at the speed control servo.
- Look for loose or unseated connector pins.
- Check for broken wires at the connectors.

The following items should be inspected before proceeding to Symptom Chart.
- Misadjusted speed control actuator cable. If misadjustment is suspected, refer to Adjustments, Actuator Cable.
- Broken speed control actuator cable.
- Carry out Self-Test Diagnostics procedure before proceeding to Symptom Chart. Symptom Related Diagnostic Procedures