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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1893 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 6.6L (LMM) - DTC P1448 TOP DTC P2510)DTC P2453CIRCUIT/SYSTEM TESTING
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2

Circuit/System Testing

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Circuit/System Testing
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: Perform the Repair Verification after completing the Circuit/System Testing.
  1. Verify the integrity of the DPF system by visually and physically inspecting any of the following conditions:
    • Any damaged exhaust system components
    • Loose or improperly installed exhaust system components-Ensure the smaller diameter pressure line is connected to the front of the DPF and to the smaller port of the differential pressure sensor.
    • Restrictions in the exhaust differential pressure sensor ports
    • Damaged, bent, completely restricted, exhaust differential pressure lines-The lines should not be modified and should have a continuous downward gradient from the sensor.
    • Inspect for fuel contaminates. Refer to Contaminants-in-Fuel Diagnosis .
  2. Verify the integrity of the entire air induction system by inspecting for the following conditions:
    • A loose air inlet duct
    • A loose turbocharger air inlet clamp
    • A damaged air cleaner housing
    • A missing or damaged air cleaner restriction indicator
    • A loose, leaking, or cracked intake manifold air resonator
  3. Remove and inspect the flexible part of the exhaust differential pressure lines for internal restrictions.
    • If a condition is found replace the exhaust pressure lines.
  4. Engine running, verify that the scan tool Particulate Filt. Pressure Variance parameter is greater than 0 kPa (0 psi), and increases as engine speed is increased.
    • If less than the specified range, and the parameter decreases as engine speed is increased, inspect for incorrect differential pressure line routing, or a blockage in the rear pressure line.
  5. Ignition OFF, disconnect the harness connector at the exhaust differential pressure sensor.
  6. Ignition OFF and scan tool disconnected for 90 seconds, test for less than 5 Ξ© between the low reference circuit terminal 1 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.
  7. Ignition ON, test for 4.8-5.2V between the 5V reference circuit terminal 3 and ground.
    • If less than the specified range, test the 5V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the 5V reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  8. Verify the scan tool Particulate Filt. Pressure Variance parameter is greater than 98 kPa.
    • If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.
  9. Install a jumper wire between the low reference circuit terminal 1 and signal circuit terminal 2. Verify the scan tool Particulate Filt. Pressure Variance parameter is less than -13.0 kPa.
    • 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.
  10. Connect the harness connector at the exhaust differential pressure sensor.
  11. Allow the engine coolant temperature to reach a minimum of 50Β°C (122Β°F). With the engine running in Park, depress the accelerator pedal until maximum engine speed is obtained. While the engine is at maximum speed, observe the scan tool Particulate Filt. Pressure Variance parameter. The value should be greater than 5 kPa (0.73 psi).
    • If less than the specified value, inspect the DPF substrate. If the substrate is missing or damaged, replace the DPF.
  12. Road test the vehicle while performing a snapshot of the after-treatment data list and the actions listed below:
    1. Drive the vehicle at a steady speed between 48-64 kph (30-40 mph) for 90 seconds.
    2. Gradually increase the vehicle speed for 5 seconds, then decrease the vehicle speed. When conditions are safe, bring the vehicle to a stop.
    3. Graph the MAF Sensor g/s and the APP Indicated parameters. The MAF Sensor g/s parameter should follow the APP Indicated parameter, change smoothly without any spikes or dropouts during all driving conditions.
    • If the MAF Sensor g/s parameter does not follow the APP Indicated parameter, or has spikes/dropouts, test all MAF circuits for an open/short to ground, or a poor connection. If the circuits test normal, replace the MAF sensor.
  13. If all circuits, the exhaust system, fuel system, air intake, MAF sensor, DPF, and the differential pressure lines test normal, test the exhaust differential pressure sensor. Refer to Component Testing.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.