Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Chevrolet >> 2009 >> Chevy Express G2500, Van Cargo Extended, 6.6 6 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 6.6L LMM - DTC P0016 To DTC P02E0 >> DTC P0112 or P0113 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the mass air flow MAF/IAT sensor.
  2. Ignition OFF and scan tool disconnected for 90 seconds, test for less than 5 ohms between the IAT Sensor 1 low reference circuit terminal 4 and ground.
    • If greater than the specified range, test the IAT Sensor 1 low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition OFF and scan tool disconnected for 90 seconds, test for less than 5 ohms between the MAF sensor low reference circuit terminal 2 and ground.
    • If greater than the specified range, test the MAF sensor low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  4. Ignition ON, verify the scan tool IAT Sensor 1 parameter is less than -39°C (-38°F).
    • If warmer than the specified range, test the signal circuit terminal 5 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 5 and a ground. Verify the scan tool IAT Sensor 1 parameter is warmer than 148°C (298°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 MAF/IAT sensor.
scientia non olet · About Mike's Workshop Manuals