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Home >> Chevrolet >> 1996 >> Astro Van Cargo, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0500 - Vehicle Speed Sensor Circuit >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) System Check. Retrieve and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. Go to next step.
  2. Using scan tool, clear DTCs. Using Connector Test Adapter Kit (J35616) and a DVOM set to AC 200 volt scale, backprobe across VSS harness connector signal and ground circuits. Raise and support vehicle. Start engine and place transmission in gear. If voltage is constant, go to step 5). If voltage is not constant, go to next step.
  3. If voltage varies, see DIAGNOSTIC AIDS. If voltage does not vary, go to next step.
  4. If scan tool displays NO VOLTAGE, go to step 11). If scan tool does not display NO VOLTAGE, go to step12).
  5. With vehicle still raised, disconnect VSS connector. With engine running, place transmission in gear. Using a DVOM on 200-volt AC scale, check voltage across signal and ground circuits at VSS. If voltage varies with RPM, go to step 7). If voltage does not vary, go to next step.
  6. Replace VSS and go to step 12).
  7. Check for faulty connection at VCM and VSS. If faulty connection is found, go to step 9). If connections are okay, go to next step.
  8. Check for open or short in ground and signal circuits between VCM and VSS. If problem is found, go to step 10). If no problem is found, go to step 12).
  9. Repair connection as necessary and go to step 12).
  10. Repair open or short as necessary and go to step 12).
  11. Replace VCM. Program replacement VCM using required equipment. After repair is completed, go to next step.
  12. Using scan tool, select DTC, CLEAR INFO function. Start engine and allow it to reach operating temperature. Using scan tool, select DTC, SPECIFIC function and enter DTC P0500. Operate vehicle within conditions required to set DTC. If scan tool displays RAN AND PASSED, go to next step. If scan tool does not display RAN AND PASSED, return to step 2).
  13. Using scan tool, select Read and Record INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, diagnose affected DTCs. If no DTCs are displayed, system is okay.
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