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Home >> Chevrolet >> 2009 >> Traverse LS, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.6L - DTC P0638 To DTC P2635 >> DTC P2122, P2123, P2127, P2128, or P2138 >> Component Testing

Component Testing

  1. Connect a 3 A fused jumper wire between the 5-volt reference terminal of the applicable APP sensor and 5 V. 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 approximately 0.90-4.35 V without any spikes or dropouts. The voltage for APP 2 should vary between approximately 0.40-2.20 V 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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