Initial Inspection and Diagnostic Overview

1. Verify customer concern by operating the speed control system.
2. Visually inspect the following components of the speed control system:

Visual Inspection Chart

Mechanical
^ Vacuum leaks
^ Improper cable adjustment
^ Cable freedom
^ Throttle linkage freedom
^ Improper actuator mounting

Electrical
^ Blown fuses:
- 15A ENGINE
- 20A STOP
^ Brake on loft (BOO) switch
^ Clutch pedal position switch (CPP switch)
^ Corroded or poor connections
^ Broken or loose wiring

3. Exercise the accelerator pedal. Check the speed control cable and accelerator cable for freedom and proper adjustment.
4. Check the vacuum hose to the speed control servo for cracks, kinks, and/or blockage.
5. Check the wiring harness for obvious signs of shorts, opens, bad connections, or damage.
6. Make sure the speedometer, stoplamps, and clutch pedal function properly.
7. Road test the vehicle to check the speed control system performance.







The speed control system can be operated and diagnosed using the Rotunda Speed Control Tester 007-00013, or equivalent. The tester works on vehicles with all combinations of control switches, transaxles, speedometers (electronic and mechanical), brakes, and clutches. With three modes of operation (AUTOMATIC, SINGLE SCAN, and SCAN PROBE), the tester can pinpoint any failure, including wiring, vacuum hose, switch and actuator failures. The tester includes an instruction manual with its own specially developed diagnostic tree charts for identifying any failed or faulty component in the speed control system.

Before entering the Symptom Chart, perform a road test. If the speed control does not function properly, take note of the condition causing the failure.

8. Start the engine.
9. Turn the speed control system ON.

CAUTION: If the system should appear to go out of control or overspeed during the road test, be prepared to turn the system off with the OFF button or the ignition switch.

10. Accelerate the vehicle and hold it at 56 km/h (35 mph).
11. Press and release the Set and Accelerate (SET ACC) button. The vehicle should maintain a constant 56 km/h (35 mph).
12. Press the OFF button. The speed control should shut off and the vehicle should start to slow down.
13. Accelerate the vehicle to 56 km/h (35 mph) and turn the speed control ON.
14. Press and hold the SET ACC button and remove your foot from the accelerator pedal. The vehicle's speed should gradually increase.
15. When the vehicle's speed reaches 80 km/h (50 mph), release the SET ACC button. The vehicle should maintain a steady 80 km/h (50 mph).
16. Press and hold the Coast (CST) button. The speed should slowly decrease.
17. Release the CST button at 56 km/h (35 mph). The vehicle should maintain a steady speed at 56 km/h (35 mph) when the CST button is released.
18. Press the SET ACC button and hold it until the vehicle reaches 80 km/h (50 mph).
19. Depress and release the brake pedal. The speed control system should shutoff and the vehicle should decrease in speed. Slow the vehicle down to 56 km/h (35 mph).
20. Press and release the Resume (RSM) button. The vehicle's speed should increase to 80 km/h (50 mph).
21. Press and release the OFF button.
22. The vehicle should slow down - the speed control is off.