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Home >> GMC >> 2001 >> Jimmy 2D Utility, 4WD, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> System Tests >> Cruise Control Inoperative/Malfunctioning >> With Cruise Control Tester J42958

With Cruise Control Tester J42958

CAUTION: Tests are designed for use with General Motors Tech 2 scan tool and Cruise Control Tester (J42958). Generic test equipment may not be able to perform all required test functions.
  1. If Diagnostic System Check was performed, go to next step. If Diagnostic System Check was not performed, see DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Connect Cruise Control Tester (J42958) between harness connector of cruise control module and cruise control module. Place cruise control on/off switch in OFF position. Turn ignition on, engine off. If ignition LED on Cruise Control Tester is illuminated, go to next step. If LED is not illuminated, go to step  20 .
  3. If Brake/TCC LED on Cruise Control Tester is illuminated, go to next step. If LED is not illuminated, go to step  22 .
  4. If Brake Lights LED on Cruise Control Tester is off, go to next step. If LED is on, go to step  24 .
  5. Press and release brake pedal. If Brake/TCC LED on Cruise Control Tester turns off, go to next step. If LED does not turn off, go to step  23 .
  6. Place cruise control ON/OFF switch in ON position. Leave this switch on until instructed to turn off. If ON/OFF and INHIBIT/ENABLE LED on Cruise Control Tester illuminates, go to next step. If LED did not illuminate, go to step  25 .
  7. If CRUISE LAMP LED on Cruise Control Tester is illuminated, go to next step. If LED is not illuminated, go to step  26 .
  8. Press and release Set/Coast switch. If Set/Coast LED on Cruise Control Tester illuminated when Set/Coast switch was pressed and turned off when switch was released, go to next step. If LED did not illuminate when switch was pressed and turn off when switch was released, go to step  28 .
  9. Press and release Resume/Accel switch. If Resume/Acc LED on Cruise Control Tester illuminated when switch was pressed and turned off when switch was released, go to next step. If LED did not illuminate when switch was pressed and turn off when switch was released, go to step  29
  10. Perform the following:
    • Press and release INHIBIT/OVERRIDE button on cruise control tester.
    • Press and release BRAKE button on cruise control tester.
    • Press and release S/C (Set/Coast) button on cruise control tester.

    If CRUISE ENGAGE LED illuminated continually after S/C button was pressed and released, go to next step. If LED did not illuminate continually, go to step  20 .

  11. While observing throttle lever at throttle body, press R/A (Resume/Accelerate) button on cruise control tester for 5 seconds and then release. If throttle lever moves toward full open position and closes to about one-half throttle position when R/A button is released, go to next step. If throttle lever does not operate as described, go to step  33 .
  12. While observing throttle lever at throttle body, press S/C (Set/Coast) button on cruise control tester for 5 seconds and then release. If throttle lever moves toward closed position and then returns to about one-half throttle position when S/C button is released, go to next step. If throttle lever does not operate as described, go to step  33 .
  13. Press and release R/A (Resume/Accelerate) button on cruise control tester 3 times. Press and release BRAKE button on cruise control tester. If CRUISE ENGAGE LED on cruise control tester turns off and throttle lever closes, go to next step. If LED remains illuminated and/or throttle lever does not close, go to step  33 .
  14. Raise and support vehicle so that drive wheels may be rotated. Block one drive wheel. Turn ignition switch to ON position. Place gear selector in DRIVE position. Observe VSS LED on cruise control tester while rotating unblocked drive wheel. If VSS LED flashes while drive wheel is being rotated, go to next step. If LED does not flash as described, go to step  31 .
  15. If cruise control module harness connector terminal "H" has a wire installed in it, go to next step. If there is no wire connected to control module harness connector terminal "H", go to step  19 .
  16. Following manufacturer's instructions, connect General Motors Tech 2 scan tool. Turn ignition switch to ON position. Select POWERTRAIN SPECIAL FUNCTIONS and then OUTPUT CONTROLS for CRUISE INHIBIT. While observing INHIBIT ENABLE LED on cruise control tester, command scan tool to enable cruise control. If LED dims, go to next step. If LED does not dim, go to step  30 .
  17. Turn ignition switch to OFF position. Disconnect cruise control tester and reconnect wiring harness to cruise control module. Road test vehicle at speeds greater than 25 MPH. Operate cruise control system. Using scan tool, observe CRUISE INHIBIT status. If scan tool displays ENABLED, go to next step. If scan tool does not display ENABLED, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  18. If cruise control system operates normally, problem is intermittent. See PRELIMINARY INSPECTION  under TROUBLE SHOOTING. If cruise control system does not operate normally, go to step  33 .
  19. Reconnect all components. Road test vehicle at speeds greater than 25 MPH. Operate cruise control system. If cruise control system operates normally, problem is intermittent. See PRELIMINARY INSPECTION  under TROUBLE SHOOTING. If cruise control system does not operate normally, go to step  33 .
  20. Test for open, high resistance or short to ground in ignition voltage circuit (Brown wire) of cruise control module. If problem was found, repair as necessary and then go to step  36 . If problem was not found, go to next step.
  21. Repair high resistance or open in ground circuit (Black/White wire) of cruise control module. If problem was found, repair as necessary and then go to step  36 . If problem was not found, go to step  33 .
  22. Repair open or short to ground in cruise control release switch input circuit (Brown/White wire) of cruise control module. If problem was found and repaired, go to step  36 . If problem was not found and repaired, go to step  32 .
  23. Repair short to voltage in cruise control release switch input circuit (Brown/White wire) of cruise control module. If problem was found and repaired, go to step  36 . If problem was not found and repaired, go to step  32 .
  24. Repair open or high resistance in brake light switch input circuit (Brown/White) of cruise control module. If problem was found and repaired, go to step  36 . If problem was not found and repaired, go to step  32 .
  25. Repair open or short to ground in cruise control ON/OFF input circuit (Gray wire) of cruise control module. If problem was found and repaired, go to step  36 . If problem was not found and repaired, go to step  34 .
  26. Disconnect Cruise Control Tester from cruise control module, but leave vehicle harness connected to Cruise Control Tester. If CRUISE LAMP LED remained off when cruise control module was disconnected, go to next step. If LED turned on when cruise control module was disconnected, go to step  33 .
  27. Test for an open or short to ground in cruise engaged output circuit (Light Blue/Black wire). If problem was found and repaired, go to step  36 . If problem was not found and repaired, go to step  35 .
  28. Test for an open or short to ground in Set/Coast input circuit (Dark Blue wire). If problem was found and repaired, go to step  36 . If problem was not found and repaired, go to step  34 .
  29. Test for an open or short to voltage in Resume/Accel input circuit (Gray/Black wire). If problem was found and repaired, go to step  36 . If problem was not found and repaired, go to step  34 .
  30. Test for an open or high resistance in cruise inhibit circuit between cruise control module and VCM. If problem was found and repaired, go to step  36 . If problem was not found and repaired, go to step  35 .
  31. Test for an open or high resistance in vehicle speed signal circuit (Dark Green/White wire) between cruise control module and VCM. If problem is found and repaired, go to step  36 . If problem was not found and repaired, go to step  35 .
  32. Replace brake switch. See BRAKELIGHT & CLUTCH PEDAL POSITION SWITCHES  under REMOVAL & INSTALLATION. After completing repair, go to step  36 .
  33. Replace cruise control module. See CRUISE CONTROL MODULE ASSEMBLY  under REMOVAL & INSTALLATION. After completing repair, go to step  36 .
  34. Replace multifunction turn signal lever. See appropriate STEERING COLUMN SWITCHES article in ACCESSORIES & EQUIPMENT. After completing repair, go to step  36
  35. Replace PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. Go to next step.
  36. Operate vehicle within conditions for cruise control operation.
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