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Home › Pontiac › 2008 › G8 GT › Repair and Diagnosis › Engine Performance › System › Engine Control System & Fuel System - 6.0L - DTC P0336 To DTC P250A › DTC P250A › Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the engine oil pressure (EOP) sensor.
  2. Ignition OFF, test for less than 1 ohm of resistance between the low reference circuit and a known ground.
    • If greater than 1 ohm, test the low reference circuit for a short to voltage or 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 and a known ground.
    • If less than 4.8 volts, test the 5 volt reference circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the ECM.
    • If greater than 5.2 volts, test the 5 volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Connect an approved test lamp between the 5-volt reference circuit and the signal circuit at the wiring harness connector.
    • If the test lamp does not illuminate test the signal circuit for a open/high resistance. If the circuit tests normal replace the ECM.
  5. If all circuits test normal, test or replace the EOP sensor.
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