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Home >> Chevrolet >> 2006 >> Optra LS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 1.4L DOHC >> Diagnostic Information and Procedures >> DTC P0341 or P0342 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector of the CMP sensor.
    2. IMPORTANT: The test lamp is used to load the circuit and may not illuminate.
  2. Connect a test lamp between the ignition 1 voltage circuit of the CMP sensor and the negative terminal of the battery.
  3. Ignition ON, test for less than 0.5 volt between the ignition 1 voltage circuit of the CMP sensor and the positive terminal of the battery.
    • If greater than 0.5 volt, repair the ignition 1 voltage circuit of the CMP sensor for a short to ground or an open/high resistance.
  4. Connect a test lamp between the ground circuit and the ignition 1 voltage circuit of the CMP sensor.
    • If the test lamp does not illuminate, test for an open/high resistance on the ground circuit. If circuit/connections test normal, replace the ECM.
  5. Ignition OFF, connect a DMM between the signal circuit and the low reference circuit of the CMP sensor.
  6. Ignition ON, verify that 4.8-5.2 volts is available on the signal circuit and the low reference circuit of the CMP sensor.
    • If less than 4.8 volts, test the signal circuit for a short to ground or an open/high resistance. If the circuits/connections test normal, replace the ECM.
    • If more than 5.2 volts, test the signal circuit for a short to voltage. If the circuits/connections test normal, replace the ECM.
  7. If all circuits/connections test normal, replace the CMP sensor.
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