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Home › Chevrolet › 2011 › Impala LTZ › Repair and Diagnosis › Engine Performance › System › Engine Controls And Fuel - 3.9L - DTC P0010 Through DTC P0340 › DTC P0112 or P0113 › Circuit/System Testing

Circuit/System Testing

    NOTE: All modules must be powered down or misdiagnosis may result.
  1. Ignition OFF, all vehicle systems OFF, this may take up to 2 minutes.
  2. Ignition OFF, disconnect the harness connector at the B75B MAF/IAT sensor.
  3. Ignition OFF, test for less than 5 Ω between the low reference circuit terminal D 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 K20 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 E for a short to ground. If the circuit tests normal, replace the K20 ECM.
  5. Install a 3 A fused jumper wire between the signal circuit terminal E 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 K20 ECM.
  6. If all circuits test normal, test or replace the B75B MAF/IAT sensor.
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