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Home › Chevrolet › 2007 › Aveo Base › Repair and Diagnosis › Engine Performance › System › Engine Controls & Fuel - 1.6L - DTC P0650 To P2A01 › DTC P1396 or P1397 › Circuit/System Testing

Circuit/System Testing

    IMPORTANT: If the ABS lamp is illuminated, the ABS system must be diagnosed prior to using this diagnostic procedure. Refer to Diagnostic System Check - Vehicle .
  1. Ignition OFF, disconnect the harness connector of the wheel speed sensor or the EBCM, if equipped with ABS.
  2. Ignition OFF, test for less than 5 ohms between the low reference circuit and ground.
    • If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit/connections test normal, replace the ECM.
  3. Ignition ON, test for 4.8-5.2 volts on the signal circuit.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
    • If less than the specified range, test the signal circuit for a short to ground or an open. If the circuit/connections test normal, replace the ECM.
  4. If all circuits/connections test normal, test or replace the wheel speed sensor or EBCM, if equipped with ABS.
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