Checking Main Components
- Replace cruise control unit with a known good unit. Recheck cruise control operation. If cruise control operates, replace cruise control unit. If cruise control does not operate, reinstall old cruise control unit.
- Replace actuator with a known good actuator. Recheck cruise control operation. If cruise control operates, replace actuator. If cruise control does not operate, reinstall old actuator.
- Replace valve assembly with a known good assembly. Recheck cruise control operation. If cruise control operates, replace valve assembly. If cruise control does not operate, reinstall old valve assembly.
- Replace pump with a known good pump. Recheck cruise control operation. If cruise control operates, replace pump. If cruise control does not operate, check wiring, connections and vacuum hoses.