LEMON Manuals: Even more car manuals for everyone
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 P0107 or P0108 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
IMPORTANT: Perform the Circuit/System Verification before proceeding with the Circuit/System Testing.
  1. Ignition OFF, disconnect the harness connector at the MAP sensor.
  2. Ignition OFF, allow at least 60 seconds for the ECM to power down. Test for less than 5 ohms of resistance between the low reference circuit terminal A and a good 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.
  3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal C and ground.
    • If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  4. Verify the scan tool MAP Sensor parameter is less than 45 kPa.
    • If greater than the specified range, test the signal circuit terminal B 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 B and the 5-volt reference circuit terminal C. Verify the scan tool MAP Sensor parameter is greater than 250 kPa.
    • If less than the specified range, test the sensor signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  6. If all circuits test normal, test the MAP sensor. Refer to Component Testing for instructions.
scientia non olet · About LEMON Manuals