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Home >> Pontiac >> 2009 >> Vibe Base, 1.8 8, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 1.8L (Lay) - DTC P0010 To DTC P0420 >> DTC P0111 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
  2. Ignition OFF, test for less than 10 ohms between the low reference circuit terminal 2 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 IAT 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 1 and the low reference circuit terminal 2. Verify the IAT 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 IAT sensor.
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