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Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo, 6.6 6 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Control System & Fuel System - 6.6L (LLY) - DTC P0016 To DTC P0341) >> DTC P0101 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
IMPORTANT: All electrical components and accessories must be turned OFF and allowed to power down.

You must perform the Circuit/System Verification before proceeding with 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 4 and ground.
    • If greater than 5 ohms, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition ON, verify a test lamp illuminates between the ignition circuit terminal 3 and ground.
    • If test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  4. Ignition ON, verify the scan tool MAF sensor parameter is less than 0 g/s.
    • If greater than 0 g/s, test the signal circuit terminal 5 for a short to voltage. If the circuit tests normal, replace the ECM.
  5. Install a 3A fused jumper wire between the signal circuit terminal 5 and the IAT signal circuit terminal 2. Verify the scan tool MAF sensor parameter is greater than 500 g/s.
    • If less than 500 g/s, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  6. Test for air leaks at the manifold absolute pressure (MAP) sensor seal.
    • If a leaking sensor seal is verified, repair as necessary.
  7. Test the charge air cooler system for leaks. Refer to Charge Air Cooler Diagnosis (Charge Air Cooler Air Leak Test) or Charge Air Cooler Diagnosis (Full System Air Leak Test) .
    • If a charge air cooler leak is found, repair as necessary.
    8. IMPORTANT: Do NOT drain the coolant at this time.
  8. Remove the air inlet tube to intake manifold. Refer to Exhaust Gas Recirculation Valve Cooler Replacement . Perform steps 1-15.
  9. Visually inspect the EGR valve and verify the valve is in the closed position.
    • If the EGR valve is not in the closed position, replace the EGR valve.
    • If the EGR valve inspection is normal, replace the MAF/IAT sensor.
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