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Home >> Cadillac >> 2009 >> SRX 4.6 A, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 4.6L - DTC P0010 To DTC P0333 >> DTC P0112 or P0113 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
  2. Ignition OFF for 90 seconds, 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 colder than -39°C (-38°F).
    • If warmer 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 or replace the MAF/IAT sensor.
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