LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2008 >> Optra LS, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 2.0L (Diesel) >> Diagnostic Information and Procedures >> DTC P2452, P2454, or P2455 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, and the MAIN fuse removed, disconnect the harness connector at the DPF differential pressure sensor.
  2. Test for less than 5 ohms of resistance between the low reference circuit terminal 2 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.
  3. Install the MAIN fuse. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 and ground.
    • If less than the specified range, test the 5-volt reference circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Verify the scan tool DPF differential pressure sensor parameter is greater than 4.8 volts.
    • If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.
  5. Install a 1A fused jumper wire between the signal circuit terminal 3 and ground. Verify the scan tool DPF differential pressure sensor parameter is less than 0.5 volts.
    • If greater 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 DPF differential pressure sensor.
scientia non olet · About LEMON Manuals