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Home >> Chevrolet >> 2006 >> Optra5 LS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 1.4L DOHC >> Diagnostic Information and Procedures >> DTC P0510 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector of the idle speed control (ISC) motor. Ignition ON, verify the Idle Switch parameter displays OFF.
    • If the Idle Switch parameter displays ON, test the idle switch signal circuit for a short to ground. If the circuit/connections test normal, replace the ECM.
  2. Install a 3-amp fused jumper wire between the idle switch signal circuit and the negative terminal of the battery. Verify the Idle Switch parameter displays ON.
    • If the Idle Switch parameter displays OFF, test the idle switch signal circuit for an open. If the circuit/connections test normal, replace the ECM.
    • If the fuse in the jumper wire opens repair the short to voltage on the idle switch signal circuit.
  3. Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit of the ISC motor and the negative terminal of the battery.
    • If greater than 5 ohms, test the low reference circuit of the ISC motor 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 throttle body.
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