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Home › Cadillac › 2009 › DTS 4.6 9 › Repair and Diagnosis › Engine Performance › System › Engine Control System & Fuel System - 4.6L - DTC P0016 To DTC P0336 › DTC P0335 › Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the CKP sensor.
  2. Test for less than 1 ohm of resistance between the CKP low reference circuit terminal B and ground.
    • If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition ON, test for 4.8-5.2 volts between the CKP 5-volt reference circuit terminal A and ground.
    • If less than the specified range, test the 5-volt reference circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Ignition ON, test for 4.8-5.2 volts between the CKP signal circuit terminal C and ground.
    • If less than the specified range, test the signal circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM.
  5. Ignition ON, connect a test lamp between the CKP signal circuit terminal C and ground. The test lamp should not illuminate.
    • If the test lamp illuminates, test the CKP signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  6. Ignition OFF, connect a fused jumper wire to the CKP signal circuit terminal C.
  7. Ignition ON, momentarily touch the other end of the fused jumper wire to the battery negative post. The CKP Active counter parameter should increment.
    • If the CKP active counter increments, replace the CKP sensor.
    • If the CKP active counter does not increment, replace the ECM.
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