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Home >> Cadillac >> 2010 >> STS 3.6 V, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 18 (Engine Controls And Fuel - 4.6L (LH2) - DTC P0335 To DTC P2544) >> DTC P0335 >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF and scan tool disconnected for 90 seconds, disconnect the X104 inline harness connector.
  2. Test for less than 1 ohm between low reference circuit terminal A 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 B 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 to the CKP signal circuit terminal B on the ECM side of the connector.
  6. Ignition ON, momentarily touch the other 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 X104 inline harness connector to the CKP sensor, for any damage, opens, or shorts.
    • If the circuits test normal replace the CKP sensor.
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