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Home >> Chevrolet >> 2008 >> Optra5 LT, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 1.6L >> Diagnostic Information and Procedures >> DTC P0335, P0336, or 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 at the CKP sensor.
  2. Ignition ON, test for 1.5-2.0 volts between the signal circuit terminal 2 and the low reference circuit terminal 1.
    • If less than the specified range, test the applicable 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 applicable circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  3. If all circuits test normal, test or replace the CKP sensor.
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