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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 P2459 >> 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 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. Install a jumper wire between the low reference circuit terminal 1 of the differential sensor and ground.
  4. Install a jumper wire at terminal 2 of the differential sensor.
  5. Connect a DMM between the jumper wire from terminal 2 of the differential sensor and ground.
  6. 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 between the signal terminal 2 and the low reference terminal 1. 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 differential pressure sensor.
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