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Test NTC-24: Checking Speed Control Operation

NOTE: Possible causes are: ground circuit open, speed control brake switch output short to ground, speed control power supply circuit (PCM to brake switch) open, CANCEL switch defective, SET/RESUME switch defective, brake switch defective, brake switch misadjusted, defective brake switch connector, PCM defective, speed control servo connector defective, vacuum reservoir defective or vacuum supply leak or restriction.
NOTE: Perform this procedure ONLY when no speed control codes are set.
  1. Turn ignition on with engine off. Using scan tool, observe speed control switch inputs. While observing scan tool, press speed control ON switch. If scan tool displays speed control on, go to next step. If scan tool does not display speed control ON, go to TEST NTC-22: CHECKING SPEED CONTROL ON/OFF SWITCH  .
  2. While observing scan tool, press speed control SET switch several times. If scan tool displayed PRESSED and RELEASED, go to next step. If scan tool did not display PRESSED and RELEASED, go to TEST NTC-23: CHECKING SPEED CONTROL SET/RESUME SWITCH  .
  3. While observing scan tool, press brake pedal several times. If scan tool displayed PRESSED and RELEASED, go to next step. If scan tool did not display PRESSED and RELEASED, go to TEST NTC-19: CHECKING BRAKE SWITCH SENSE  .
  4. While observing scan tool, move gear selector to Drive. If scan tool displayed P/N and D/R, go to next step. If scan tool did not display P/N and D/R, go to TEST NTC-20: CHECKING PARK/NEUTRAL SWITCH  .
  5. While observing scan tool, press speed control CANCEL switch several times. If scan tool displayed PRESSED and RELEASED, go to next step. If scan tool did not display PRESSED and RELEASED, replace CANCEL switch. Perform TEST VER-4A: SPEED CONTROL VERIFICATION  .
  6. While observing scan tool, press speed control RESUME switch several times. If scan tool displayed PRESSED and RELEASED, go to next step. If scan tool did not display PRESSED and RELEASED, replace SET/RESUME switch. Perform TEST VER-4A: SPEED CONTROL VERIFICATION  .
  7. Turn ignition off. Disconnect speed control servo 4-pin connector. Inspect electrical connector and clean/repair as necessary. Turn ignition on with engine off. Using scan tool, actuate speed control vent solenoid. Using a DVOM, check voltage of speed control brake switch circuit (Dark Blue/Red wire) at servo 4-pin connector. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, go to step  18 .
  8. Start engine. Allow engine to idle for one minute. Turn ignition off. Turn ignition on with engine off. Using scan tool, actuate speed control servo solenoids. Observe throttle. If throttle does not open and close, go to next step. If throttle opens and closes, go to TEST NTC-21: CHECKING SPEED CONTROL DENIED MESSAGE  .
  9. Turn ignition off. Using a DVOM, check resistance of speed control servo connector ground circuit (Black wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open ground circuit. Perform TEST VER-4A: SPEED CONTROL VERIFICATION  .
  10. Disconnect vacuum supply hose from speed control servo. Connect a vacuum gauge to disconnected hose. Start engine and idle. Turn ignition off. Observe vacuum gauge. If manifold vacuum was present for at least 10 seconds after turning engine off, go to next step. If manifold vacuum was not present for at least 10 seconds after turning engine off, replace vacuum reservoir. Perform TEST VER-4A: SPEED CONTROL VERIFICATION  .
  11. Disconnect vacuum supply hose from speed control servo. Connect a vacuum gauge to disconnected hose. Start engine. Observe vacuum gauge. If manifold vacuum is present, go to next step. If manifold vacuum is not present, repair vacuum supply as necessary. Perform TEST VER-4A: SPEED CONTROL VERIFICATION  .
  12. Inspect speed control servo connector for corroded, damaged, pushed out or miswired terminals. If connector is okay, go to next step. If connector is not okay, repair as necessary. Perform TEST VER-4A: SPEED CONTROL VERIFICATION  .
  13. Using a DVOM, check resistance of speed control servo connector speed control brake switch output circuit (Dark Blue/Red wire). If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground on brake switch output circuit. Perform TEST VER-4A: SPEED CONTROL VERIFICATION  .
  14. Disconnect brake switch 6-pin connector. Inspect electrical connector and clean/repair as necessary. Turn ignition on with engine off. Using scan tool, actuate speed control vent solenoid. Using a DVOM, check voltage of brake switch connector speed control power supply circuit (Yellow/Pink wire). If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, go to step  17 .
  15. Turn ignition off. Check brake switch adjustment. If brake switch adjustment is okay, go to next step. If brake switch adjustment is not okay, adjust brake switch. Perform TEST VER-4A: SPEED CONTROL VERIFICATION  .
  16. Inspect brake switch connector for corroded, damaged, pushed out or miswired terminals. If connector is okay, go to step  24 . If connector is not okay, repair as necessary. Perform TEST VER-4A: SPEED CONTROL VERIFICATION  .
  17. Inspect brake switch connector for corroded, damaged, pushed out or miswired terminals. If connector is okay, go to step  27 . If connector is not okay, repair as necessary. Perform TEST VER-4A: SPEED CONTROL VERIFICATION  .
  18. Turn ignition off. Using a DVOM, check resistance of speed control servo connector speed control brake switch output circuit (Dark Blue/Red wire). If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair speed control brake switch output circuit short to ground. Perform TEST VER-4A: SPEED CONTROL VERIFICATION  .
  19. Using a DVOM, check resistance of speed control servo ground circuit (Black wire) between speed control servo connector and chassis ground. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open ground circuit. Perform TEST VER-4A: SPEED CONTROL VERIFICATION  .
  20. Disconnect brake switch 6-pin connector. Inspect electrical connector and clean/repair as necessary. Turn ignition on with engine off. Using scan tool, actuate speed control vent solenoid. Using a DVOM, check voltage of brake switch connector speed control power supply circuit (Yellow/Red wire). If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, go to step  25
  21. Turn ignition off. Check brake switch adjustment. If brake switch adjustment is okay, go to next step. If brake switch adjustment is not okay, adjust brake switch. Perform TEST VER-4A: SPEED CONTROL VERIFICATION  .
  22. Disconnect brake switch connector. Inspect brake switch connector for corroded, damaged, pushed out or miswired terminals. If connector is okay, go to next step. If connector is not okay, repair as necessary. Perform TEST VER-4A: SPEED CONTROL VERIFICATION  .
  23. Disconnect speed control servo 4-pin connector. Inspect servo connector for corroded, damaged, pushed out or miswired terminals. If connector is okay, go to next step. If connector is not okay, repair as necessary. Perform TEST VER-4A: SPEED CONTROL VERIFICATION  .
  24. If no other potential causes are remaining, brake switch is assumed to be defective. Replace brake switch and adjust. Perform TEST VER-4A: SPEED CONTROL VERIFICATION  .
  25. Turn ignition off. Inspect brake switch 6-pin connector for corroded, damaged, pushed out or miswired terminals. If connector is okay, go to next step. If connector is not okay, repair as necessary. Perform TEST VER-4A: SPEED CONTROL VERIFICATION  .
  26. Disconnect speed control servo 4-pin connector. Inspect servo connector for corroded, damaged, pushed out or miswired terminals. If connector is okay, go to next step. If connector is not okay, repair as necessary. Perform TEST VER-4A: SPEED CONTROL VERIFICATION  .
  27. Disconnect brake switch 6-pin connector. Disconnect Powertrain Control Module (PCM) connector C1 (located nearest to front of vehicle). PCM is located to left of Power Distribution Center (PDC) in engine compartment. Inspect electrical connectors and clean/repair as necessary. Using a DVOM, check resistance of speed control power supply circuit between brake switch 6-pin connector (Yellow/Pink wire) and PCM connector C1 terminal No. 5 (Yellow/Red wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open speed control power supply circuit between brake switch connector and PCM connector C1. Perform TEST VER-4A: SPEED CONTROL VERIFICATION  .
  28. If no other potential causes are remaining, PCM is assumed to be defective. Replace PCM. Perform TEST VER-4A: SPEED CONTROL VERIFICATION  .
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