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Home >> Chevrolet >> 2009 >> Traverse LS, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.6L - DTC P0008 To DTC P0191 >> DTC P0111-P0113 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
  2. Remove the fuse that supplies B+ to circuit terminal X2-56 of the ECM.
    3. CAUTION: 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.
  3. Test for less than 5 Ω between the low reference circuit terminal E and ground.
    • 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/connections test normal, replace the ECM.
  4. Install the fuse that supplies B+ to circuit terminal X2-56 of the ECM.
  5. Ignition ON, verify that the scan tool 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/connections test normal, replace the engine control module (ECM).
    6. NOTE: If the fuse in the jumper wire opens, the signal circuit is shorted to a voltage and the sensor may be damaged.
  6. Ignition ON, install a 3 A fused jumper wire between the signal circuit terminal D and ground circuit terminal C. Verify the IAT sensor parameter is warmer than 134°C (274°F).
    • If colder than the specified value, test the signal circuit 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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