| DTC P0500 (17-1): | VSS Circuit Malfunction |
| 1. | Test-drive the vehicle. |
| 2. | Check the vehicle speed with the scan tool. Is the correct speed indicated? YES - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the VSS and at the ECM.n NO - Go to 3. |
| 3. | Turn the ignition switch OFF. |
| 4. | Block the rear wheels and set the parking brake. |
| 5. | Raise the front of the vehicle, and make sure it is securely supported. |
| 6. | Turn the ignition switch ON (II). |
| 7. | Block the right front wheel, and slowly rotate the left front wheel. |
| 8. | Measure voltage between ECM connector terminals A18 and A24.
Does the voltage pulse between 0 V and 5 V or battery voltage? YES - Substitute a known-good ECM and recheck. If symptom/indication goes away, replace the original ECM.n NO - Go to 9. |
| 9. | Turn the ignition switch OFF. |
| 10. | Disconnect the negative cable from the battery. |
| 11. | Disconnect ECM connector A (31P). |
| 12. | Reconnect the negative cable from the battery. |
| 13. | Turn the ignition switch ON (II). |
| 14. | Block the right front wheel, and slowly rotate the left front wheel. |
| 15. | Measure voltage between ECM connector terminals A18 and A24.
Does the voltage pulse between 0 V and 5 V or battery voltage? YES - Substitute a known-good ECM and recheck. If symptom/indication goes away, replace the original ECM.n NO - Check these items:
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