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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1800 (ENGINE CONTROLS AND FUEL - 3.6L - DTC P0008 TO DTC P0193)DTC P0111-P0113CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Circuit/System Testing

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Testing
WARNING: This page is about a different car, the 2009 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
  2. 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).
  3. Ignition OFF, remove the fuse that supplies B+ to circuit terminal X2-56 of the ECM.
    4. 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.
  4. Test for less than 5 ohms 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.
  5. Install the fuse that supplies B+ to circuit terminal X2-56 of the 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 3A fused jumper wire between the signal circuit terminal D and ground circuit terminal C. Verify the IAT sensor parameter is greater than 134°C (274°F).
    • If less 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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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.