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Home › Chevrolet › 2007 › Optra5 LS, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls And Fuel - 1.6L (L91) › Diagnostic Information and Procedures › DTC P0112 or P0113 › Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector of the IAT sensor.
  2. Ignition ON, test for 4.8-5.2 volts between the signal circuit terminal and battery ground.
    • If less than 4.8 volts, test the signal circuit for a short to ground or an open. If the circuit/connections test normal, replace the ECM.
      • IMPORTANT: If the signal circuit is shorted to voltage the sensor may be damaged.
    • If greater than 5.2 volts, test the signal circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
  3. Test for less than 0.5 volt between the low reference circuit of the IAT sensor and ground.
    • If greater than 0.5 volt, test the low reference circuit of the IAT sensor for a short to voltage. If the circuit/connections test normal, replace the ECM.
  4. Install a 3-amp fused jumper wire between the signal circuit and the low reference circuit. Verify the IAT sensor parameter is greater than 128°C (262°F).
    • If less than 128°C (262°F), test the signal circuit for a short to voltage or an open/high resistance. If the circuit/connections test normal, replace the ECM.
  5. If all circuits/connections test normal, test or replace the IAT sensor.
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