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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. Before clearing the DTC, use the scan tool to record the freeze frame and failure records for reference. The CLEAR INFO function will erase the data. Record the DTC freeze frame and failure records. Clear the DTC. Raise and support the rear axle assembly. Start the engine. Place the transmission in any drive range. With the drive wheels rotating, does the input shaft speed increase with the drive wheel speed? If so, see DIAGNOSTIC AIDS . If not, go to next step.
  3. Turn ignition off. Disconnect the PCM connector C2. Using a DVOM and the Connector Test Adapter Kit (J-35616-A), measure the resistance between PCM harness connector C2 terminals No. 22 and 23. Does the resistance measure 1377-3355 ohms? If so, go to next step. If not, go to step  6.
  4. Measure the resistance from PCM harness connector C2 terminals No. 22 to ground. Does the resistance measure greater than 50 k/ohms? If so, go to next step. If not, go to step  8.
  5. Reconnect the PCM connector C2. Disconnect the engine wiring harness from the ISS. Turn ignition on, engine off. Test the high circuit (1230) of the ISS for a short to power. Test the low circuit (1231) of the ISS for a short to power. Did you find and correct the condition? If so, go to step  13. If not, go to step  12.
  6. Disconnect the engine wiring harness from the ISS assembly. Measure the resistance of the ISS assembly. Does the resistance measure 1377-3355 ohms? If so, go to next step. If not, go to step  11.
  7. Was the resistance measured in step  3 greater than 3355 ohms? If so, go to step  9. If not, go to step  10.
  8. Test the high circuit (1230) of the ISS for a short to ground. Test the low circuit (1231) of the ISS for a short to ground. Did you find and correct the condition? If so, go to step  13.
  9. Test the high circuit (1230) of the ISS for an open. Test the low circuit (1231) of the ISS for an open. Did you find and correct the condition? If so, go to step  13.
  10. Test the high circuit (1230) and the low circuit (1231) of the ISS for a short together. Did you find and correct the condition? If so, go to step  13.
  11. Replace the ISS assembly. See SPEED SENSORS  under REMOVAL & INSTALLATION. Did you complete the replacement? If so, go to step  13.
  12. Replace the PCM. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION. Did you complete the replacement? If so, go to next step.
  13. Perform the following procedure to verify the repair:
    • Select DTC.
    • Select CLEAR INFO.
    • The transmission output speed is greater than 450 RPM.
    • All conditions are met for 2 seconds.
    • Select SPECIFIC DTC.
    • Enter DTC P0717.

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

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