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Home >> Chevrolet >> 2008 >> Optra LS, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 2.0L (Diesel) >> Diagnostic Information and Procedures >> DTC P2002 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, inspect the hose/pipes to the DPF pressure sensor for leaks, or restrictions.
    • If a condition is found, repair as necessary.
  2. Ignition OFF, and the MAIN fuse removed, disconnect the harness connector at the DPF sensor.
  3. 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.
  4. 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.
  5. Verify the scan tool DPF sensor parameter is less than 7 kPa (1 psi).
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  6. Install a 3A fused jumper wire between the signal circuit terminal 3 and the ground circuit terminal 2. Verify the DPF sensor parameter is greater than 10 kPa (1.5 psi).
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  7. Ignition OFF, connect the harness connector at the DPF pressure sensor.
  8. Ignition ON, observe the scan tool DPF pressure sensor parameter. The scan tool should display 0.5 volts.
    • If greater than the specified range, replace the DPF sensor.
  9. If all circuit tests normal, test or replace the DPF.
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