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DTC P0500: No Vehicle Speed Sensor Signal: Testing

  1. Raise drive wheels and support vehicle. Start engine. Using scan tool, read VSS signal. Shift transmission into a forward gear. Allow wheels to rotate. If VSS signal is more than zero MPH, go to next step. If VSS signal is not more than zero MPH, go to step  3 .
  2. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition:
    • Remove pinion gear from transmission. Ensure pinion gear is not damaged.
    • With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set.
    • Review freeze frame information on scan tool. Duplicate conditions present when DTC was set.
    • Refer to any Technical Service Bulletins (TSBs) that may apply.
    • Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires.
    • Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals.

    If a problem is found, repair as necessary. If no problems are found, test is complete.

  3. Turn ignition off. Disconnect VSS harness connector located on transmission extension housing. Turn ignition on. Measure voltage between ground and 8-volt supply circuit (Orange wire) at VSS harness connector. If voltage is more than 7 volts, go to next step. If voltage is 7 volts or less, repair open in Orange wire between VSS and PCM.
  4. Measure voltage between ground and signal circuit (White/Orange wire) at VSS harness connector. If voltage is 4.5-5.0 volts, go to next step. If voltage is not 4.5-5.0 volts, go to step  6 .
  5. Turn ignition off. Measure resistance between ground and sensor ground circuit (Black/Light Blue wire) at VSS harness connector. If resistance is more than 5 ohms, repair open in sensor ground circuit.If resistance is 5 ohms or less, remove and inspect pinion gear for damage. Repair as necessary. If pinion gear is okay, replace VSS.
  6. Disconnect PCM harness connectors. PCM is located in engine compartment, between air cleaner and radiator. Measure resistance between ground and signal circuit (White/Orange wire) at VSS harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short to ground in signal circuit.
  7. Measure resistance of signal circuit (White/Orange wire) between VSS harness connector and terminal No. 66 at PCM C2 harness connector. See Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in signal circuit.
  8. If no other possible causes are remaining, replace PCM.
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