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Home >> Chevrolet >> 2010 >> Impala Police >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 3.9L - DTC P0010 - DTC P0335 >> DTC P0112 or P0113 >> Circuit/System Testing

Circuit/System Testing

    NOTE: All modules must be powered down or misdiagnosis may result.
  1. Ignition OFF, disconnect the scan tool and wait 60 seconds to ensure all modules are powered down.
  2. Ignition OFF, disconnect the harness connector at the IAT sensor.
  3. Ignition OFF for 90 seconds, test for less than 5 Ω between the low reference circuit terminal E and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  4. Ignition ON, verify the scan tool IAT parameter is colder than -39°C (-38°F).
    • If warmer than the specified range, test the signal circuit terminal D for a short to ground. If the circuit tests normal, replace the ECM.
  5. Install a 3A fused jumper wire between the signal circuit terminal D and a good ground. Verify the scan tool IAT parameter is warmer than 149°C (300°F).
    • If colder than the specified range, test the 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 IAT sensor.
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