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Home >> Chevrolet >> 2007 >> Optra LS, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 1.8L (LDA) >> Diagnostic Information and Procedures >> DTC P0317 >> Circuit/System Testing
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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 ON, test for 4.8-5.2 volts on the rough road signal circuit.
    • If greater than 5.2 volts, test the rough road signal circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
    • If less than 4.8 volts, test the rough road signal circuit for a short to ground or an open. If the circuit/connections test normal, replace the ECM.
  3. Ignition OFF, test for less than 5 ohms between the low reference circuit of the wheel speed sensor and ground.
    • If greater than 5 ohms, test the low reference circuit of the wheel speed sensor for an open/high resistance. 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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