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Home › Chevrolet › 2007 › Optra LS, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls And Fuel - 1.8L (L79) › Diagnostic Information and Procedures › DTC P0337 › Circuit/System Testing

Circuit/System Testing

    IMPORTANT: If the CKP sensor lead is damaged in any way, replace the CKP sensor.
  1. Ignition OFF, disconnect the harness connector of the CKP sensor.
  2. Ignition ON, verify that 1.5-2 volts is available on the signal circuit and the low reference circuit of the CKP sensor.
    • If less than 1.5 volts, test the applicable circuit for a short to ground or an open/high resistance. If the circuits/connections test normal, replace the ECM.
    • If more than 2 volts, test the applicable circuit for a short to voltage. If the circuits/connections test normal, replace the ECM.
  3. If all circuits/connections test normal, test or replace the CKP sensor.
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