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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1657 (Engine Control System & Fuel System - 6.6L (LMM) - DTC P0016 To DTC P02E7) >> DTC P0112 or P0113 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the mass air flow MAF/IAT sensor.
  2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 Ω between the IAT Sensor 1 low reference circuit terminal 4 and ground.
    • If greater than the specified range, test the IAT Sensor 1 low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 Ω between the MAF sensor low reference circuit terminal 2 and ground.
    • If greater than the specified range, test the MAF sensor low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  4. Ignition ON, verify the scan tool IAT Sensor 1 parameter is colder than -39°C (-38°F).
    • If warmer than the specified range, test the IAT signal circuit for a short to ground. If the circuit tests normal, replace the ECM.
    5. NOTE: If a short to voltage is found on the IAT signal circuit, the 3A fuse in the jumper wire will open.
  5. Install a 3A fused jumper wire between the IAT signal circuit terminal 5 and a ground. Verify the scan tool IAT Sensor 1 parameter is warmer than 148°C (298°F).
    • If colder than the specified range, test the IAT signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  6. If all circuits test normal, test or replace the MAF/IAT sensor.
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