Test NTC-21: Checking Speed Control Denied Message
At this time speed control switch and servo functions appear to operate properly. Using scan tool, observe speed control OUTPUT status. Road test vehicle at speeds more than 35 MPH and attempt to set cruise control. The last or most recent cause for speed control not to set is indicated by the denied status. The following items will not allow speed control to set:
- If ON/OFF denied message is indicated, PCM does not see an ON signal from switch at terminal No. 41 (Red/Light Green wire).
- If SPEED denied message is indicated, vehicle speed seen by PCM at terminal No. 66 (White/Orange wire) is not more than 30 MPH.
- If RPM denied message is indicated, engine RPM is excessively high.
- If BRAKE denied message is indicated, brake switch sense circuit is open indicating to PCM that brakes are applied. The sense circuit PCM terminal No. 62 (White/Red wire) is grounded through brake pedal switch when brakes are released.
- If P/N denied message is indicated, P/N switch sense circuit is grounded indicating to PCM that transmission is not in gear. The sense circuit PCM terminal No. 76 (Black/White wire) is grounded through P/N switch when transmission is in Park or Neutral.
- If RPM/SPD denied message is indicated, PCM senses excessive engine RPM for a given vehicle speed.
- If SOL FLT denied message is indicated, PCM senses a servo solenoid circuit trouble code that is maturing or set in memory.