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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1151 (Engine Controls And Fuel - 3.6L - DTC P0496 To DTC P2235) >> DTC P2122, P2123, P2127, P2128, or P2138 >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  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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