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Home >> Chevrolet >> 2006 >> Optra LS, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 1.4L DOHC >> Diagnostic Information and Procedures >> DTC P0107 or P0108 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector of the MAP sensor.
  2. Ignition ON, verify that the MAP sensor parameter is less than 12 kPa.
    • If greater than 12 kPa, test the signal circuit of the MAP sensor for a short to voltage. If the circuit/connections test normal, replace the ECM.
    3. IMPORTANT: The test lamp is used to load the circuit and may not illuminate.
  3. Ignition ON, connect a test lamp between the 5-volt reference circuit of the MAP sensor and the negative battery terminal.
    4. IMPORTANT: The 5-volt reference circuits are internally and externally connected at the ECM. Other component DTCs may be set. If other DTCs are set, review the electrical schematic and diagnose the applicable circuits and components.
  4. Test for 4.8-5.2 volts between the 5-volt reference circuit of the MAP sensor and the negative battery terminal.
    • If less than 4.8 volts, test the 5-volt reference circuit of the MAP sensor for a short to ground or open/high resistance. If the circuit/connections test normal, replace the ECM.
    • If greater than 5.2 volts, test the 5-volt reference circuit of the MAP sensor for a short to voltage. If the circuit/connections test normal, replace the ECM.
  5. Ignition ON, test for less than 0.2 volt between the low reference circuit of the MAP sensor and the negative battery terminal.
    • If greater than 0.2 volt, test the low reference circuit of the MAP sensor for a short to voltage. If the circuit/connections test normal, replace the ECM.
  6. Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit of the MAP sensor and the negative terminal of the battery.
    • If greater than 5 ohms, test the low reference circuit of the MAP sensor for an open/high resistance. If the circuit/connections test normal, replace the ECM.
  7. Ignition ON, install a 3-amp fused jumper wire between the signal circuit and the 5-volt reference circuit of the MAP sensor to verify that the MAP sensor parameter is greater than 102 kPa.
    • If less than 102 kPa, test the signal circuit of the MAP sensor for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the ECM.
  8. If all circuits/connections test normal, test or replace the MAP sensor.
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