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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 753 (Manual Transmission - GETRAG 5 Speed) >> Diagnostic Information and Procedures >> DTC P0502 or P0503 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the ECM harness connector X1.
  2. Measure for 1,300-1,500 ohms at 25°C (77°F) between the VSS high signal circuit terminal 54 and the VSS low signal circuit terminal 34.
    • 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.
  3. Measure for more than 10 ohms of resistance between the VSS high signal circuit terminal 54 and ground.
    • If the value is less than the specified range, repair the short to ground.
  4. Measure for more than 10 ohms of resistance between the VSS low signal circuit terminal 34 and ground.
    • If the value is less than the specified range, repair the short to ground.
  5. Reconnect the ECM connector. Disconnect the VSS connector.
  6. 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.
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