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Home >> Cadillac >> 2010 >> STS 3.6 V, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 18 (Engine Controls And Fuel - 4.6L (LH2) - DTC P0335 To DTC P2544) >> DTC P2120, P2122, P2123, P2125, P2127, P2128, or P2138 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition ON, observe the scan tool APP Sensor 1 Voltage parameter. The reading should be between 0.33-4.5 volts and change with accelerator pedal input.
  2. Ignition ON, observe the scan tool APP Sensor 2 Voltage parameter. The reading should be between 0.33-4.5 volts and change with accelerator pedal input.
  3. Ignition ON, observe the scan tool APP Sensor 1 and 2 parameter. The scan tool should indicate Agree.
  4. Clear the DTCs with the scan tool.
  5. Operate the vehicle within the Conditions for Running the DTC or within the conditions that you observed from the Freeze Frame/Failure Records.
  6. Verify that the following DTCs are not set: P0641, P0651, P2120, and P2125
    • If either or both DTCs P2120 or P2125 are set and they are the only DTCs set, replace the ECM.
    • If DTC P0641 or P0651 is set, refer to DTC P0641 or P0651 .
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