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Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo, 6.6 6 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Engine Control System & Fuel System - 6.6L (LLY) - DTC P0401 To DTC P2510) >> DTC P2122, P2123, P2127, P2128, or P2138 >> Component Test

Component Test

WARNING: This page is about a different variant/trim than selected.
IMPORTANT: You must perform the Circuit/System Test before proceeding with the Component Test.

Dynamic Test

  1. Ignition OFF, install a 3-amp fused jumper wire between the 5-volt reference circuit terminal of the affected APP sensor and 5 volts.
  2. Install a jumper wire between the low reference circuit terminal and a ground.
  3. Install a jumper wire at the signal circuit terminal of the affected sensor.
  4. Ignition ON, sweep the sensor through the entire range while monitoring the voltage between the signal terminal jumper wire and the low reference terminal with a DMM. The voltage should vary between 0.40-4.55 volts without any spikes or dropouts.
    • If the voltage is not within the specified range or is erratic, replace the APP sensor assembly.
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