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Home >> Pontiac >> 2009 >> G8 GT >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 6.0L, 6.2L - P0340 To DTC P3400 >> DTC P250A >> Circuit/System Testing
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the engine oil level sensor.
  2. Ignition OFF, test for less than 1 ohm between the low reference circuit terminal C 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 V between the 5 V reference circuit terminal A and a known ground. If less than 4.8 V, test the 5 V 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 V, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  4. If all circuits test normal, test or replace the engine oil level/temperature sensor.
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