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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 228 (Engine Controls - 3.9L - DTC P0011 To P0420) >> DTC P0120, P0122, P0123, P0220, P0222, P0223 or P2135 >> 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 TP sensor 1 parameter with the scan tool. The voltage should be between 4.58-0.35 volts.
    • If the voltage is outside of the range, continue with Circuit/System Testing.
  3. Observe the TP sensor 2 parameter with the scan tool. The voltage should be between 0.35-4.59 volts.
    • If the voltage is outside of the range, continue with Circuit/System Testing.
  4. Observe the TP sensors 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 TP sensor parameters and DTC information, with the scan tool.
    • If DTC P0120 or P0220 is set and all of the previous TP sensor parameters are normal, replace the ECM.
    • If any of the previous TP sensor parameters are now abnormal or out of range, continue with Circuit/System Testing.
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