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Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo Extended, 6.6 2 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 6.6L (LLY) - DTC P0016 To DTC P0341 >> DTC P0112 or P0113 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the mass air flow (MAF)/IAT sensor.
  2. Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit terminal 1 and ground.
    • If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition ON, verify the scan tool IAT Sensor 1 parameter is less than -39°C (-38°F).
    • If greater than the specified value, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the ECM.
    4. IMPORTANT: If a short to voltage is found on the IAT signal circuit, the 3A fuse in the jumper wire will open.
  4. Install a 3A fused jumper wire between the signal circuit terminal 2 and a ground. Verify the scan tool IAT Sensor 1 parameter is greater than 149°C (300°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 ECM.
  5. If all circuits test normal, test the MAF/IAT sensor.
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