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DTC P0500: No Vehicle Speed Sensor Signal: Testing

  1. Turn ignition off. Raise and support vehicle so wheels are free to rotate. Start engine and allow it to idle. Using scan tool, read VSS signal. Place transmission in any forward gear and allow wheels to rotate. If scan tool displays more than zero MPH, go to next step. If scan tool displays zero MPH, go to step  3 .
  2. At this time, condition required to set DTC is not present. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. If connectors and wiring harness are okay, no problem is indicated at this time. Test is complete.
  3. Turn ignition off. Inspect VSS speedometer pinion gear adapter for proper seating and positioning. Adapter is located on transmission extension housing. Repair adapter as necessary. If adapter is okay, go to next step.
  4. Disconnect VSS connector. VSS connector is attached to adapter, located on transmission extension housing. Inspect connector for damaged pins, corrosion and loose terminals. Repair connector as necessary. If connector is okay, turn ignition on, with engine off. Using a voltmeter, measure voltage between ground and Violet/Orange wire at VSS harness connector. If voltage is more than 4 volts, go to next step. If voltage is 4 volts or less, repair open in Violet/Orange wire between VSS and PCM.
  5. Connect one end of a jumper wire to White/Orange wire at VSS harness connector. Ensure ignition is on, with engine off. Using scan tool, monitor VSS signal when tapping other end of jumper wire to Black/Light Blue wire at VSS harness connector several times. If scan tool displays more than zero MPH, go to next step. If scan tool displays zero MPH, go to step  7 .
  6. Turn ignition off. Remove VSS and inspect speedometer pinion gear. Repair speedometer pinion gear as necessary. If speedometer pinion gear is okay, replace VSS.
  7. Turn ignition off. Disconnect jumper wire. Disconnect PCM connectors. PCM is located on firewall in right rear corner of engine compartment. Inspect connectors for damaged pins, corrosion and loose terminals. Repair connectors as necessary. If connectors are okay, measure resistance of Black/Light Blue wire between VSS harness connector and terminal A4 at PCM C1 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 Black/Light Blue wire between VSS and PCM.
  8. Measure resistance of White/Orange wire between VSS harness connector and terminal B27 at PCM C2 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open White/Orange wire between VSS and PCM.
  9. Measure resistance between ground and White/Orange wire at VSS harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in White/Orange wire.
  10. Ensure VSS and PCM connectors are still disconnected. Measure resistance between ground and Black/Light Blue wire at VSS harness connector. If resistance is 5 ohms or more, replace PCM. If resistance is less than 5 ohms, repair short to ground in Black/Light Blue wire.
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