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Home › Chevrolet › 2008 › Optra LS, Standard › Repair and Diagnosis › Engine Performance › System › Engine Controls And Fuel - 1.4L DOHC › Diagnostic Information and Procedures › DTC P0341 or P0342 › Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the CMP sensor.
  2. Ignition ON, test for battery voltage between the ignition 1 voltage circuit terminal 1 and ground.
    • If less than B+, repair the ignition 1 voltage circuit for a short to ground or an open/high resistance.
  3. Connect a test lamp between the low reference circuit terminal 2 and the ignition 1 voltage circuit terminal 1.
    • If the test lamp does not illuminate, test for an open/high resistance on the ground circuit. If circuit tests normal, replace the ECM.
  4. Test for 4.8-5.2 volts is between the signal circuit terminal 3 and the low reference circuit terminal 2.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  5. If all circuits test normal, test or replace the CMP sensor.
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