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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 P2453 >> 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 differential pressure sensor.
  2. Install a 3A fused jumper wire between the 5-volt reference circuit terminal 3 and the corresponding terminal of the exhaust differential pressure sensor. Install a jumper wire between the low reference circuit terminal 1 of the exhaust differential pressure sensor and ground.
  3. Connect a DMM between terminal 2 of the exhaust differential pressure sensor and ground.
  4. Ignition ON, with the J 23738-A  or J 35555  connected to the exhaust differential pressure sensor rear pressure port, slowly apply vacuum while monitoring the voltage on the DMM. See Special Tools . The voltage should vary and transition smoothly without any spikes or dropouts.
    • If the voltage is erratic, replace the exhaust differential pressure sensor.
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