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Home >> Buick >> 2008 >> Allure CXL >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Engine Control System & Fuel System - 3.6L - DTC P2105 To DTC P2626) >> DTC P2122, P2123, P2127, P2128, or P2138 >> Component Testing

Component Testing

WARNING: This page is about a different variant/trim than selected.
  1. Install a 3A fused jumper wire between the 5-volt reference terminal of the applicable APP sensor and 5 volts. Install a jumper wire between the applicable low reference terminal and a ground.
  2. Sweep the sensor through the entire range while monitoring the voltage between the appropriate signal circuit terminal and the low reference terminal with a DMM. The voltage for APP 1 should vary between 0.90-4.35 volts without any spikes or dropouts. The voltage for APP 2 should vary between 0.40-2.20 volts without any spikes or dropouts.
    • If the voltage is not within the specified range or is erratic on either APP sensor, replace the accelerator pedal assembly.
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