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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 942 (Engine Controls And Fuel - 6.6L (LMM) - DTC P154B To DTC P2693) >> DTC P2454 or P2455 >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2007 GMC Sierra, 2007 GMC Cab & Chassis Sierra, 2007 Chevrolet Silverado, and 2007 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.
  3. Install a jumper wire between the low reference circuit terminal 1 of the exhaust differential pressure sensor and ground.
  4. Install a jumper wire at signal circuit terminal 2 of the exhaust pressure differential sensor.
  5. Connect a DMM between the jumper wire from signal circuit terminal 2 of the exhaust differential pressure sensor and ground.
  6. 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 between 4.8-0.4 volts, without any spikes or dropouts.
    • If the voltage is erratic, replace the exhaust differential pressure sensor.
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