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Home >> Chevrolet >> 2011 >> Caprice >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 6.0L - DTC Diagnostics And Troubleshooting >> Diagnostic Information and Procedures >> DTC P0340 >> Circuit/System Testing
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Circuit/System Testing

  1. Engine idling, move the related harnesses/connectors of the B23 camshaft position sensor while monitoring the scan tool Camshaft Position Variance parameter. The Camshaft Position Variance parameter should not change when moving the harness/connectors.
    • If the above condition exists, repair the harness/connectors as necessary.
  2. Ignition OFF, inspect the B23 camshaft position sensor for correct installation.
    • If the B23 camshaft position sensor is loose, inspect the sensor and the O-ring for damage and replace, as necessary.
  3. Ignition OFF, disconnect the harness connector at the B23 camshaft position sensor.
  4. Ignition OFF, all vehicle systems OFF. This may take 2 minutes, test for less than 5 Ω between the low reference circuit terminal B and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
  5. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal A and ground.
    • If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
    • If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  6. Test for 4.8-5.2 V between the signal circuit terminal C and ground.
    • 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 K20 ECM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  7. Ignition OFF, connect a 3 A fused jumper wire to the camshaft position signal circuit terminal C.
  8. Ignition ON, momentarily touch the end of the fused jumper wire to ground while monitoring the scan tool camshaft position active counter. The camshaft position active counter should increment.
    • If the camshaft position active counter does not increment, replace the K20 ECM.
  9. If all circuits test normal, replace the B23 camshaft position sensor.
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