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Home >> Chevrolet >> 2009 >> Chevy Express G2500, Van Cargo Extended, 6.6 6 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 6.6L LMM - DTC P1224 To DTC P2463 >> DTC P2463 >> Component Testing

Component Testing

IMPORTANT: You must perform the Circuit/System Testing in order to verify the integrity of the exhaust differential pressure sensor circuits before proceeding with Component Testing.
  1. Ignition OFF, remove the exhaust pressure differential pressure sensor.
  2. Install a 3A fused jumper wire between the 5-volt reference circuit terminal 3 and the corresponding terminal of the differential sensor. Install a jumper wire between the low reference terminal 1 of the sensor and ground.
  3. Connect a DMM between the terminal 2 of the differential sensor and ground.
  4. Ignition ON, with the J 23738-A  or J 35555  connected to the pressure sensor rear pressure port, slowly apply vacuum to the sensor while monitoring the voltage. See Special Tools . The voltage should vary and transition smoothly without any spikes or dropouts.
    • If the voltage is erratic, replace the differential sensor.
  5. If the sensor tests normal, perform the Diesel Particulate Filter (DPF) Service Regeneration .
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