FixVault
Home › Chevrolet › 2008 › Optra LS, Standard › Repair and Diagnosis › Engine Performance › System › Engine Controls And Fuel - 1.8L (LDA) › Diagnostic Information and Procedures › DTC P1396 or P1397 › Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the wheel speed sensor.
  2. Ignition OFF, test for less than 5 ohms between the low reference circuit and ground.
    • Wheel Speed Sensor left side signal circuit terminal A
    • Wheel Speed Sensor left side low reference circuit terminal B
    • Wheel Speed Sensor right side signal circuit terminal B
    • Wheel Speed Sensor right side low reference circuit terminal A
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition ON, test for 4.8-5.2 volts on the rough road signal circuit.
    • Wheel Speed Sensor left side signal circuit terminal A
    • Wheel Speed Sensor left side low reference circuit terminal B
    • Wheel Speed Sensor right side signal circuit terminal B
    • Wheel Speed Sensor right side low reference circuit terminal A
    • If less than the specified range, test the rough road signal circuit for a short to ground or an open. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the rough road signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  4. If all circuits test normal, test or replace the wheel speed sensor.
About FixVault