System Will Not Operate
- Check fuses. If blown, check cause and replace fuse. If fuse is okay, check battery voltage at control unit with main switch in "ON" position. If no voltage is present, replace main switch.
- If voltage is present, ensure control unit has a good ground. If not, ground control unit and check control unit operation.
- If control unit is grounded, check if set signal is transmitted from sub-switch to control unit. If signal is not transmitted, replace control switch. If signal is transmitted, ensure vehicle speed pulse from speedometer is transmitted to control unit.
- If no speed pulse is transmitted to control unit, check speedometer operation. If speedometer does not operate properly, replace speed sensor located inside speedometer.
- If speedometer operation is correct, check for faulty contact of pulse signal cable connecting speedometer to cruise control unit. If speed pulse is transmitted to control unit, check clutch switch (M/T) or 2-pole connector (A/T) clutch switch.
- If clutch switch does not operate properly, replace switch. If clutch 2-pole connector is not shorted, short circuit and ground 2-pole connector for clutch switch.
- If switch and connector are okay, depress brake pedal. Check if brake lights come on. If brake lights do not come on, check and replace bulb(s) as necessary. If bulbs are okay, replace brake switch.
- If brake lights do come on, release brake pedal. Check for battery voltage at harness connector terminal of cruise control unit. If no voltage is present, replace brake switch.
- If voltage is present, replace control unit with a known good unit and recheck operation. If cruise control operates properly, replace control unit. If cruise control does not operate properly, reinstall old control unit and replace actuator with a known good actuator.
- Check actuator operation. If actuator operates properly, replace actuator. If actuator does not operate properly, reinstall old actuator. Replace valve assembly with a known good valve.
- Check valve operation. If valve operates properly, replace valve. If valve does not operate properly, reinstall old valve. Replace pump assembly with a known good pump. Check pump operation. If pump operates properly, replace pump. If pump does not operate properly, check wiring, connections and hoses.