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Home >> Cadillac >> 2008 >> STS V >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 4.4L - DTC P0153 To DTC P0651 >> DTC P0335 >> Circuit/System Testing
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Circuit/System Testing

P0335

  1. Ignition OFF, disconnect the 8-way harness connector C-148.
  2. Test for less than 1 ohm of resistance between low reference circuit terminal B on the ECM side of the connector 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 5-volt reference circuit terminal C on the ECM side of the connector 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 signal circuit terminal A on the ECM side of the connector and ground.
    • If less than the specified range, test the affected signal 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 affected signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  5. Ignition OFF, connect a fused jumper wire connected to the CKP signal circuit terminal A on the ECM side of the connector.
  6. Ignition ON, momentarily touch the end of the fused jumper wire to the negative battery post. The CKP active counter parameter on the scan tool should increment.
    • If the CKP Active Counter parameter does not increment, replace the ECM.
  7. Ignition OFF, inspect the wiring harness, from the 8-way connector C-148 to the CKP sensor, for any damage, opens, or shorts.
    • If the circuits test normal replace the CKP sensor.

P0336

  1. Ignition OFF, inspect the CKP sensor for correct installation.
    • If the sensor is loose, inspect the sensor and the O-ring for damage, replace as necessary.
  2. Inspect the engine for the following conditions:
    • The engine oil for debris
    • The crankshaft reluctor wheel for damage
    • The timing chain, tensioner, and sprockets for wear or damage
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