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Diagnostic Procedure

WARNING: This page is about a different car, the 2002 GMC Yukon XL, 2002 GMC Sierra, 2002 Chevrolet Suburban, and 2002 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Install a scan tool. Turn ignition on, engine off. Select TR SW. on the scan tool. With the scan tool, observe the TR SW. display while selecting each transmission range. Does each selected transmission range match the scan tool TR SW. display? If so, see DIAGNOSTIC AIDS . If not, go to next step.
  3. Inspect the PNP switch assembly for damaged, loose or missing mounting hardware and proper adjustment. Inspect the shift cable for damaged or stretched cable and proper adjustment. See appropriate AUTOMATIC article in TRANSMISSION SERVICING. Did you find and correct a condition? If so, go to step  16. If not, go to next step.
  4. With the scan tool, observe the TR SW. A/B/C/P display. Does the scan tool TR SW. A/B/C/P parameter indicate HI for all range signal states? If so, go to step  13. If not, go to next step.
  5. Turn ignition off. Disconnect the TR switch 4-way connector. Turn ignition on, engine off. Does the scan tool TR SW. A/B/C/P parameter indicate HI for all range signal states? If so, go to next step. If not, go to step  10.
  6. Using a DVOM and the Connector Test Adapter Kit (J-35616-A), measure the voltage from terminal "A" of the TR switch 4-way connector to ground. Measure the voltage from terminal "B" of the TR switch 4-way connector to ground. Measure the voltage from terminal "C" of the TR switch 4-way connector to ground. Measure the voltage from terminal "D" of the TR switch 4-way connector to ground. Does the voltage measure within 10-12 volts at all 4 terminals? If so, go to next step. If not, go to step  11.
  7. Connect a fused jumper wire from terminal "D" of the TR switch 4-way connector (signal "A" circuit) to ground while monitoring the scan tool TR SW. A/B/C/P parameter. When the signal "A" circuit (771) is grounded, do any other signal circuits indicate LOW? If so, go to step  12. If not, go to next step.
  8. Connect a fused jumper wire from terminal "B" of the TR switch 4-way connector (signal "B" circuit) to ground while monitoring the scan tool TR SW. A/B/C/P parameter. When the signal "B" circuit (772) is grounded, do any other signal circuits indicate LOW? If so, go to step  12. If not, go to next step.
  9. Connect a fused jumper wire from terminal "C" of the TR switch 4-way connector (signal "C" circuit) to ground while monitoring the scan tool TR SW. A/B/C/P parameter. When the signal "C" circuit (773) is grounded, do any other signal circuits indicate LOW? If so, go to step  12. If not, go to step  14.
  10. Test the signal circuit(s) (771, 772, 773 and 776) of the TR switch that did not indicate HI for a short to ground. Did you find and correct the condition? If so, go to step  16. If not, go to step  15.
  11. Test the signal circuit(s) (771, 772, 773 and 776) of the TR switch that did not indicate proper voltage for an open. Did you find and correct the condition? If so, go to step  16. If not, go to step  15.
  12. Test the affected signal circuits of the TR switch for a shorted together condition. Did you find and correct the condition? If so, go to step  16. If not, go to step  15.
  13. Test the ground circuit (451) of the TR switch for an open. Did you find and correct the condition? If so, go to step  16. If not, go to next step.
  14. Replace the TR switch. See PARK/NEUTRAL POSITION SWITCH  under REMOVAL & INSTALLATION. Did you complete the replacement? If so, go to step  16.
  15. Replace the PCM. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION. Did you complete the replacement? If so, go to next step.
  16. Perform the following procedure to verify the repair:
    • Select DTC.
    • Select CLEAR INFO.
    • Drive the vehicle greater than 5 MPH for a short distance, then stop the vehicle.
    • Select each transmission range.
    • Place the transmission in Park.
    • Select SPECIFIC DTC.
    • Enter DTC P0706.

    Has the test run and passed? If so, system is okay. If not, go to step  1.

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