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Home >> Cadillac >> 2006 >> STS V >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 4.4L - DTC P0010 To P0175 >> DTC P0112 or P0113 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the MAF/IAT harness connector at the MAF/IAT sensor.
  2. Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit terminal D 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 parameter is less than -39°C (-38°F).
    • If greater than the specified value, test the signal circuit terminal E 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 E and a ground. Verify the scan tool IAT Sensor 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. Refer to Component Testing for instructions.
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