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Test 1: Set Speed Not Maintained

WARNING: This page is about a different car, the 2002 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Ensure customer is not attempting to engage cruise control outside of 25-100 MPH speed range. On manual transmission models, ensure customer did not disengage the clutch while attempting to engage cruise control. On all vehicles, ensure customer did not engage the brakes while attempting to engage cruise control. Ensure transmission is not in Neutral while customer attempts to engage cruise control. If any of these conditions exist, cruise control is functioning normally. Explain to customer correct cruise control operating procedures.
  1. Attempt to sound car horn. If the horn sounds, go to next step. If horn does not sound, inspect clockspring connector (4-pin) for loose or corroded terminals. If connectors are loose or corroded, repair as necessary. Retest cruise control system. If connectors are okay, go to next step.
  2. Connect New Generation Star (NGS) Tester (49-T088-0A0) to data link connector. Start engine. Select DIAGNOSTIC TEST MODE and press trigger. If NO CODES RECEIVED/SYSTEM PASSED is displayed, all monitored systems are okay. Go to next step. If DTCs are present, see SELF-DIAGNOSTICS - (2.0L) or SELF-DIAGNOSTICS - (2.5L) article in ENGINE PERFORMANCE. If LINK MONITOR ERROR is displayed, check NGS tester connection. Once all repairs have been completed, retest cruise control system.
  3. Inspect STOP (15-amp) and TURN (10-amp) fuses. If fuses are okay, go to next step. If fuses are not okay, replace fuses and retest cruise control system. If fuses blow immediately, go to steps  11 ,  18 ,  21 and  24 .
  4. Inspect condition of cruise control actuator cable and cable linkage. If connectors are okay, go to next step. Adjust cable free play as necessary. See ACTUATOR CABLE FREE PLAY  under ADJUSTMENTS. If cruise control actuator cable is damaged, replace. See CRUISE ACTUATOR  under. REMOVAL & INSTALLATION. Retest cruise control system.
  5. Inspect brake pedal height and free play. See ADJUSTMENTS in DISC & DRUM article. Adjust as necessary, then retest cruise control system. If brake pedal free play is okay and vehicle is equipped with manual transmission, go to next step. If brake pedal free play is okay and vehicle is equipped with automatic transmission, go to step  9 .
  6. Inspect clutch pedal height and free play. See SERVICING - M/T article in TRANSMISSIONS. Adjust if necessary, then retest cruise control system. If clutch pedal free play is okay, go to next step.
  7. Disconnect cruise control actuator harness. Using DVOM, check for continuity between cruise control harness connector terminal I (Orange wire) and ground. See Figure . If continuity exists, repair short in Orange wire and then retest cruise control system. See WIRING DIAGRAMS  . If continuity does not exist, go to next step.
  8. Inspect clutch switch. See CLUTCH SWITCH  under COMPONENT TESTS. If clutch switch is okay, go to step  10 . If switch is faulty, replace clutch switch and retest cruise control system.
  9. Inspect Transmission Range (TR) switch. See TRANSMISSION RANGE SWITCH  under COMPONENT TESTS. If TR switch is okay, go to next step. If TR switch is faulty, replace TR switch and then retest cruise control system.
  10. Disconnect cruise control actuator harness connector. Turn ignition on. Measure voltage between cruise control actuator terminal "D" (Yellow/Black wire) and "A" (Red/Black wire). If voltage is present, go to step  14 . If voltage is not present, go to next step.
  11. Measure voltage between cruise control actuator terminal "D" (Yellow/Black wire) and ground. If voltage exists, go to next step. If voltage does not exist, repair wire between TURN (10-amp) fuse and cruise control actuator. See WIRING DIAGRAMS  . Retest cruise control system.
  12. Disconnect instrument cluster harness. Measure continuity between instrument cluster harness terminal 2B (Black/Orange wire) and ground. See Fig 1 . If continuity exists, go to next step. If continuity does not exist, repair Orange/Black wire and retest cruise control system. See WIRING DIAGRAMS  .
    Fig 1: Identifying Instrument Cluster Terminals
    G00048375Courtesy of MAZDA MOTORS CORP.
  13. Remove instrument cluster. See INSTRUMENT CLUSTER REMOVAL & INSTALLATION. Check continuity between instrument cluster connector terminals 2B and 2C (Red/Black wire). If continuity exists, repair White/Blue wire between cruise control actuator and instrument cluster. Retest cruise control system. If continuity does not exist, replace instrument cluster. Retest cruise control system.
  14. Disconnect cruise control actuator harness. Turn ignition on. Using DVOM, measure voltage between ground and terminal "E" (Green/Orange wire) while holding cruise control switch in OFF position. Measure voltage between ground and terminal "F" (Green wire) while holding switch in ON position. If voltage is present, go to step  21 . If voltage is not present, go to next step.
  15. Turn ignition off. While holding SET/COAST switch in ON position, measure resistance between terminals "E" and "F". If resistance is 288-252 ohms, go to next step. If resistance is not as specified, go to step  18 .
  16. Deactivate air bag system. See AIR BAG RESTRAINT SYSTEMS article in RESTRAINTS. Remove driver's side air bag. Remove lower steering column cover. Disconnect clockspring harness connectors (4 connectors in all; 2 on each side of clockspring). See Figure . Measure resistance between clockspring terminals 2A (Blue wire side) and 2B (Black/White wire side) while holding SET/COAST switch in ON position. If resistance is 228-252 ohms, repair wiring between cruise control actuator and clockspring. See WIRING DIAGRAMS  . Retest cruise control system. If resistance is not as specified, go to next step.
  17. Test cruise control switch. See CRUISE CONTROL SWITCH  under COMPONENT TESTS. If switch is okay, repair wiring between clockspring and cruise control actuator. Retest system. If switch is not okay, replace switch. Retest cruise control system.
  18. Measure voltage at clockspring terminal 2C (Yellow wire). If battery voltage is present, go to step  21 . If battery voltage is not present, go to next step.
  19. Measure voltage at clockspring terminal 2C (Black/Yellow wire). If voltage is present, go to next step. If voltage is not present, repair Yellow/Black wire between fuse block and clockspring. See WIRING DIAGRAMS  . Retest cruise control system.
  20. Test cruise control switch. See CRUISE CONTROL SWITCH  under COMPONENT TESTS. If switch is okay, repair wiring between clockspring and cruise control actuator. Retest system. If switch is not okay, replace switch. Retest cruise control system.
  21. Turn ignition on. Measure voltage between cruise control actuator harness terminal "B" (Green/White wire) and ground. Measure voltage between cruise control actuator terminal "G" (White/Green wire) and ground. If voltage is present, go to step  27 . If voltage is not present between terminal "B" and ground, go to next step. If voltage is not present between terminal "G" and ground, go to step  24
  22. Measure voltage between brake switch terminal "C" (Red/Blue wire) and ground. See Figure . If voltage is present, go to next step. If voltage is not present, repair wiring between brake switch and STOP (15-amp) fuse. See WIRING DIAGRAMS  . Retest cruise control system.
  23. Measure voltage between terminal "D" (Green/White wire) and ground. If voltage is present, repair wiring between brake switch and cruise control actuator. See WIRING DIAGRAMS  . If voltage is not present, test brake switch. See BRAKE SWITCH  under COMPONENT TESTS. Replace brake switch if defective, then retest cruise control system.
  24. Measure voltage between brake switch terminals "A" (Red/Blue wire) and ground. See Figure . If voltage is present, go to next step. If voltage is not present, repair wiring between brake switch and STOP (15-amp) fuse. See WIRING DIAGRAMS  . Retest cruise control system.
  25. Measure voltage between terminal "C" (Violet wire) and ground. If voltage is present, repair wiring between brake switch and cruise control actuator. See WIRING DIAGRAMS  . Retest cruise control system. If voltage is not present, go to next step.
  26. Test brake switch. See BRAKE SWITCH  under COMPONENT TESTS. If switch is okay, repair wiring between brake switch and cruise actuator. See WIRING DIAGRAMS  . Retest cruise control system. Replace brake switch as necessary, then retest cruise control system.
  27. Measure voltage between cruise control actuator harness terminals "A" (Red/Black wire) and "H" (Gray/Blue wire). See ACTUATOR TEST  table under COMPONENT TESTS. If voltage is as specified, replace cruise control actuator. Retest cruise control system. If voltage is not as specified, go to next step.
  28. Disconnect vehicle speed sensor connector (located on transmission, below starter). Using DVOM, measure continuity between speed sensor harness terminal "A" (Red/Black wire) and ground. If continuity is present, go to next step. If continuity is not present, repair wiring between vehicle speed sensor and ground. See WIRING DIAGRAMS  .
  29. Test vehicle speed sensor. See VEHICLE SPEED SENSOR  under COMPONENT TESTS. If vehicle speed sensor checks out okay, repair wiring harness between cruise control actuator and vehicle speed sensor. See WIRING DIAGRAMS  . Retest system. Replace vehicle speed sensor if faulty, then retest system.
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