LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2001 >> Prizm Base, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> System Tests >> Test C: Cruise Control Inoperative/Malfunctioning

Test C: Cruise Control Inoperative/Malfunctioning

  1. Review system description and operation prior to performing test. See DESCRIPTION & OPERATION  .
  2. Drive vehicle at speeds greater than 25 MPH. Depress and release CRUISE ON-OFF switch. Accelerate to desired speed. Move cruise control switch downward to SET/COAST position and release. If set speed is not maintained by cruise control system, go to next step. If set speed is maintained by cruise control system, diagnose intermittent condition. See appropriate BODY CONTROL MODULES article.
  3. Stop vehicle. Turn ignition switch to LOCK position. Connect scan tool to Data Link Connector (DLC). DLC is located under left side of instrument panel, right of steering column. Turn ignition switch to RUN position. If DTC P0120, P0500, P0505, P0758 or P1780 are not stored, go to next step. If DTC P0120, P0500, P0505, P0758 or P1780 are stored, diagnose DTC in accordance with DTC retrieved. For diagnostics of DTCs P0120, P0500 and P0505, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. For diagnostics of DTCs P0758 and P01780, see appropriate ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS.
  4. Turn ignition switch to LOCK position. Wait for 5 seconds, then turn ignition switch to RUN position. On models equipped with an automatic transmission, move gearshifter to Drive. On all models move cruise control switch downward to SET/COAST position and hold. Press CRUISE ON-OFF switch and release. CRUISE control indicator should flash twice, pause, and then repeat sequence. If CRUISE control indicator operates as specified, go to next step. If CRUISE control indicator does not operate as specified, go to step  15 .
  5. Move cruise control switch upward to RES/ACC position and hold. CRUISE control indicator should flash 3 times, pause, and then repeat sequence. If CRUISE control indicator operates as specified, go to next step. If CRUISE control indicator does not operate as specified, go to step  15 .
  6. Pull and release cruise control switch to CANCEL position. Observe CRUISE control indicator. CRUISE control indicator should turn off when cruise control switch is pulled to CANCEL position, and turn on when cruise control switch is released. If CRUISE control indicator operates as specified, go to next step. If CRUISE control indicator does not operate as specified, go to step  15 .
  7. Press and release brake pedal. Observe CRUISE control indicator. CRUISE control indicator should turn off while brake pedal is pressed, and turn on when brake pedal is released. If CRUISE control indicator operates as specified, go to next step. If CRUISE control indicator does not operate as specified, go to step  16 .
  8. If vehicle is equipped with an automatic transmission, go to next step. If vehicle is equipped with a manual transmission, go to step  10 .
  9. Move automatic transmission gearshifter to Neutral, then to Drive while observing CRUISE control indicator light. CRUISE control indicator should be on with gearshifter in Drive, and off in Neutral. If CRUISE control indicator operates as specified, go to step  11 . If CRUISE control indicator does not operate as specified, go to step  17 .
  10. Press clutch pedal while observing CRUISE control indicator. CRUISE control indicator should be off when clutch pedal is pressed and on when clutch pedal is released. If CRUISE control indicator operates as specified, go to next step. If CRUISE control indicator does not operate as specified, go to step  18 .
  11. If vehicle is equipped with an automatic transmission, move gearshifter to Park. On all models, turn ignition switch to LOCK position. Wait for 5 seconds, then turn ignition switch to START position. On models equipped with an automatic transmission, move gearshifter to Drive. On all models, move cruise control switch downward to SET/COAST position and hold. Press CRUISE ON-OFF switch and release. Accelerate 25 MPH while observing CRUISE control indicator. If CRUISE control indicator flashes, go to next step. If CRUISE control indicator does not flash, go to step  19 .
  12. If vehicle is equipped with a 4-speed automatic transmission, go to next step. If vehicle is not equipped with a 4-speed automatic transmission, go to step  14 .
  13. Set overdrive switch to ON position. Accelerate vehicle to 50 MPH. Press cruise control switch to CRUISE ON-OFF position and set speed to engage cruise control. Ensure transmission is in Overdrive. Press and hold parking brake release button while pulling up parking brake gradually (to induce load drag) until transmission downshifts into 3rd gear. Immediately release parking brake. A 2 second delay should exist before transmission upshifts from 3rd to Overdrive. If transmission delay exists, go to next step. If transmission delay does not exist, go to step  20 .
  14. Stop vehicle and turn ignition switch to LOCK position. On models equipped with 3-speed or manual transmission, disconnect cruise control module 16-pin harness connector and PCM 22-pin harness connector C3. Measure resistance in Blue/White wire between cruise control module harness connector terminal No. 13 and PCM harness connector terminal No. 7. See Fig 1 . On models equipped with an 4-speed automatic transmission, disconnect cruise control module 16-pin harness connector and PCM 22-pin harness connector C4. Measure resistance in Blue/White wire between cruise control module harness connector terminal No. 13 and PCM harness connector terminal No. 10. See Fig 2 . On all models, if resistance is less than 2 ohms, go to next step. If resistance is 2 ohms or more, repair open in Blue/White wire between cruise control module and PCM. After repair, go to step  28 .
    Fig 1: Identifying 3-Speed Automatic Transmission & Manual Transmission Powertrain Control Module Harness Connector Terminals
    G99C03052Courtesy of GENERAL MOTORS CORP.
    Fig 2: Identifying 4-Speed Automatic Transmission Powertrain Control Module Harness Connector Terminals
    G00021010Courtesy of GENERAL MOTORS CORP.
  15. Disable air bag. See appropriate AIR BAG RESTRAINT SYSTEMS article. Disconnect cruise control switch. Measure resistance between terminals No. 3 and 4 of cruise control switch with switch in CANCEL, RES/ACC and SET/COAST positions. See CRUISE CONTROL SWITCH RESISTANCE VALUES  table. If resistance is as specified, go to step  22 . If resistance is not as specified, go to step  23 .
    CRUISE CONTROL SWITCH RESISTANCE VALUES

    Switch Position Ohms
    Cancel 0-0.5
    Resume/Accelerate 900-920
    Set/Coast 220-240
  16. Disconnect cruise control module 16-pin harness connector. While depressing brake pedal, measure voltage between ground and cruise control module harness connector terminal No. 2. See Figure . If battery voltage exists, go to step  22 . If battery voltage does not exist, go to step  24 .
  17. Disconnect cruise control module 16-pin harness connector. Measure voltage between ground and cruise control module harness connector terminal No. 3 (Blue/Black wire). See Figure . Place gearshifter in Drive. If battery voltage exists, go to step  22 . If battery voltage does not exist, go to step  25 .
  18. Disconnect cruise control module 16-pin harness connector. Measure voltage between ground and cruise control module harness connector terminal No. 3 (Blue/Black wire). See Figure . Depress clutch pedal. If battery voltage does not exist, go to step  22 . If battery voltage exists, go to step  25 .
  19. Stop vehicle and turn ignition switch to LOCK position. Disconnect cruise control module 16-pin harness connector. Disconnect junction block No. 3 20-pin harness connector C1. Measure resistance in Purple/White wire between junction block No. 3 harness connector C1 terminal No. 18 and cruise control module harness connector terminal No. 12. See Figure and Figure . If resistance is less than 2 ohms, go to step  22 . If resistance is 2 ohms or more, repair open in Purple/White wire between cruise control module and junction block No. 3. After repair, go to step  28 .
  20. Stop vehicle and turn ignition switch to LOCK position. Disconnect cruise control module 16-pin harness connector. Disconnect PCM 28-pin harness connector C3. Measure resistance in Red/White wire between PCM harness connector C3 terminal No. 1 and cruise control module connector terminal No. 14. See Figure and Fig 2 . If resistance is less than 2 ohms, go to next step. If resistance is 2 ohms or more, repair open in Red/White wire between PCM and cruise control module. After repair, go to step  28 .
  21. Turn ignition switch to RUN position. Measure voltage between ground and cruise control module harness connector terminal No. 14 (Red/White wire). See Figure . If voltage does not exist, go to next step. If any voltage exists, repair short to voltage in Red/White wire between PCM and cruise control module. After repair, go to step  28 .
  22. Inspect cruise control module harness connector for loose or corroded terminals. Check for intermittent condition. See INTERMITTENTS in appropriate BODY CONTROL MODULES article. If concern still exists, go to step  26 . If concern does not exist, go to step  28 .
  23. Inspect cruise control switch harness connector for loose or corroded terminals. Check for intermittent condition. See INTERMITTENTS in appropriate BODY CONTROL MODULES article. If concern still exists, go to step  27 . If concern does not exist, go to step  28 .
  24. Repair open in brakelight circuit between cruise control module and brakelight switch. See WIRING DIAGRAMS  . After repair, go to step  28 .
  25. Repair open in cruise control release circuit between cruise control module and cruise control release switch. See WIRING DIAGRAMS  . After repair, go to step  28 .
  26. Replace cruise control module. After repair, go to step  28 .
  27. Replace cruise control switch. After repair, go to next step.
  28. Operate cruise control system to verify repair. If concern does not exist, system is okay. If concern still exists, go to step  3 .
scientia non olet · About LEMON Manuals