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Home >> Cadillac >> 2010 >> Escalade EXT >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System & Fuel System - 5.3L, 6.0L, 6.2L - DTC P0010 To DTC P0231/P025A >> DTC P0112 or P0113 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
  2. Ignition OFF, all vehicles systems OFF, this may take up to for 2 min, test for less than 5 Ω between the IAT low reference circuit terminal A and ground.
    • If greater than the specified range, test the IAT low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition ON, verify the scan tool IAT parameter is colder than -39°C (-38°F).
    • If warmer than the specified range, test the IAT signal circuit terminal B for a short to ground. If the circuit tests normal, replace the ECM.
  4. Install a 3 A fused jumper wire between the IAT signal circuit terminal B and ground. Verify the scan tool IAT parameter is warmer than 149°C (300°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.
  5. If all circuits test normal, test or replace the MAF/IAT sensor.
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