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Home › Pontiac › 2009 › Vibe Base, 1.8 8, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Control System & Fuel System - 1.8L (Lay) - DTC P0010 To DTC P0420 › DTC P0116 › Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the ECT sensor.
  2. Ignition OFF, test for less than 10 ohms between the low reference circuit terminal 1 and ground G104.
    • If greater than the specified range, test the low reference circuit for an open/high resistance or for a short to voltage. If the circuit tests normal, replace the PCM.
  3. Ignition ON, verify that the ECT sensor parameter is at -40°C (-40°F).
    • If greater than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the PCM.
  4. Install a 3A fused jumper wire between the signal circuit terminal 2 and the low reference circuit terminal 1. Verify the scan tool ECT sensor parameter is greater than 139°C (280°F).
    • If less than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the PCM.
  5. If all circuits test normal, test or replace the ECT sensor.
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