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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1057 (Engine Controls And Fuel - 6.6L - DTC P1224 To DTC P2463) >> DTC P2454 or P2455 >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: You must perform the Circuit/System Testing in order to verify the integrity of the exhaust pressure differential sensor circuits before proceeding with the 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 pressure differential 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 the signal circuit terminal 2 of the exhaust differential pressure sensor and ground.
  4. Ignition ON, with the J 23738-A  or the J 35555  , slowly apply vacuum to the sensor while observing 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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