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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 231 (Engine Controls - 3.9L - DTC P0442 To P2A01) >> DTC P2120, P2122, P2123, P2125, P2127, P2128 or P2138 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
  1. With the ignition ON and the engine OFF, observe the DTC information on the scan tool.
  2. With the accelerator pedal in the rest position, observe the APP Sensor 1 parameter with the scan tool. The voltage should be between 0.33-4.59 volts.
    • If the voltage is outside of the range, continue with Circuit/System Testing.
  3. Observe the APP Sensor 2 parameter with the scan tool. The voltage should be between 0.16-2.30 volts.
    • If the voltage is outside of the range, continue with Circuit/System Testing.
  4. Observe the APP Sensor 1 and 2 parameter with the scan tool. The sensors should indicate Agree.
    • If the sensors indicate Disagree, continue with Circuit/System Testing.
  5. Clear the DTCs with a scan tool.
  6. Turn OFF the ignition for 60 seconds.
  7. Operate the vehicle within the conditions for running the DTCs.
  8. With the ignition ON and the engine OFF, observe the previous APP sensor parameters and DTC information, with the scan tool.
    • If DTC P2120 or P2125 is set and all of the previous APP sensor parameters are normal, replace the ECM.
    • If any of the previous APP sensor parameters are now abnormal or out of range, continue with Circuit/System Testing.
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