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Home >> Cadillac >> 2006 >> STS Base, 3.6 7, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 3.6L - DTC P0008 To P0128 >> DTC P0111 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the MAF/IAT sensor.
  2. Ignition ON, verify that the IAT sensor parameter is at -40°C (-40°F).
    • If greater than -40°C (-40°F), test the signal circuit of the IAT sensor for a short to ground. If the circuit/connections test normal, replace the ECM.
  3. Ignition OFF, remove the ECM/TCM fuse from the underhood fuse block.
    4. NOTE: Do NOT use a test lamp to test the continuity of the circuit. Damage to the control module may occur due to excessive current draw.
  4. Test for less than 5 ohms between the low reference circuit and the ECM housing.
    • If greater than 5 ohms, test the low reference circuit for an open/high resistance, or for a short to voltage. If the circuit/connections test normal, replace the ECM.
  5. Ignition OFF, install the ECM/TCM fuse to the underhood fuse block.
  6. Ignition ON, install a 3-amp fused jumper wire between the signal circuit and the low reference circuit of the IAT sensor and verify the IAT sensor parameter is greater than 132°C (270°F).
    • If less than 132°C (270°F), test the signal circuit of the IAT sensor for a short to voltage or an open/high resistance. If the circuit/connections test normal, replace the ECM.
  7. If all circuits/connections test normal, test or replace the MAF/IAT sensor.
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