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DTC P0500: No Vehicle Speed Sensor Signal (3SP Auto Trans): Testing

  1. Raise and support vehicle so front wheels are free to rotate. Start engine. Using scan tool, monitor VSS. Place transaxle in any forward gear. If scan tool displays more than zero MPH, turn ignition off and go to next step. If scan tool displays zero MPH, go to step  3.
  2. At this time, conditions for DTC to set do not exist or fault is an intermittent problem. Remove and inspect VSS pinion gear. VSS is mounted on extension housing on firewall side of transaxle. Replace VSS pinion gear as necessary. If VSS pinion gear is okay, start engine and allow it to idle. Ensure engine is at normal operating temperature. Using scan tool, monitor parameters related to DTC while wiggling connectors and wiring harness. If value changes while wiggling connectors and wiring harness, repair connectors and wiring harness where wiggling caused value to change. If value does not change, review Freeze Frame data using scan tool. Attempt to duplicate condition that caused DTC to set. Check for any related technical service bulletins that may apply. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. See WIRING DIAGRAMS article. If no problems are indicated, test is complete.
  3. Turn ignition off. Disconnect VSS connector. VSS is mounted on extension housing on firewall side of transaxle. Turn ignition on. Measure voltage between ground and Brown/Pink 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 Brown/Pink wire between PCM and VSS. PCM is located on left side of engine compartment, near front of battery.
  4. Measure voltage between ground and Dark Blue/Orange wire 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 Dark Blue/Dark Green wire at VSS harness connector. If resistance is 5 ohms or more, repair open in Dark Blue/Dark Green wire between PCM and VSS. If resistance is less than 5 ohms, remove and inspect VSS pinion gear. Replace VSS pinion gear as necessary. If VSS pinion gear is okay, replace VSS.
  6. Ensure ignition is off. Disconnect PCM connectors. PCM is located on left side of engine compartment, near front of battery. Measure resistance between ground and Dark Blue/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 Dark Blue/Orange wire between PCM and VSS.
  7. Measure resistance of Dark Blue/Orange wire between VSS harness connector and terminal No. 66 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 in Dark Blue/Orange wire.
  8. At this time, PCM is assumed to be defective. Replace PCM. Program the new PCM. See PROGRAMMING .
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