Circuit/System Testing
- Disconnect the ECM harness connector X2.
- Measure for 1,300-1,500 ohms at 25°C (77°F) between the VSS high signal circuit terminal 53 and the VSS low signal circuit terminal 40.
- If the value is greater than 1,500 ohms test the VSS high signal circuit and the VSS low signal circuit for an open/high resistance. If the circuits/connections test normal, replace the vehicle speed sensor.
- If the value is less than 1,300 ohms test the VSS high signal and the VSS low signal circuits for a shorted together condition. If the circuits/connections test normal, replace the vehicle speed sensor.
- Measure for more than 10 ohms of resistance between the VSS high signal circuit terminal 53 and ground.
- If the value is less than the specified range, repair the short to ground.
- Measure for more than 10 ohms of resistance between the VSS low signal circuit terminal 40 and ground.
- If the value is less than the specified range, repair the short to ground.
- Reconnect the ECM connector. Disconnect the VSS connector.
- Ignition ON, test the VSS high signal circuit terminal B for a short to voltage.
- If all circuits/connections test normal, test or replace the VSS.