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Home >> Cadillac >> 2007 >> STS V >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 4.4L - DTC P0700 To DTC P2544 >> DTC P2261 >> Circuit/System Verification
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Circuit/System Verification

  1. If DTCs P0069, P0101, P0106, P0107, P0108, P012B, P012C, P012D, P0641, P0651, P2227 are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
  2. Ignition ON, observe the BARO, MAP, and SC Inlet Pressure parameters. All 3 sensor kPa values should be within 5 kPa of each other and also the actual barometric pressure (BARO). Determine the altitude for your area and compare the parameters to the range specified in the altitude vs. barometric pressure table. Refer to Altitude Versus Barometric Pressure .
    3. CAUTION: Refer to Road Test Caution .
  3. Engine running, on a road test perform a brief wide open throttle (WOT) acceleration from a stop. The MAP sensor parameter on the scan tool should increase rapidly. This increase should be from approximately 35 kPa at idle to more than 135 kPa.
  4. Ignition OFF, inspect for the following conditions:
    • The vacuum lines for any cracking, loose fit, and for the proper connections at the following:
      • The bypass valve actuator
      • The bypass valve solenoid
      • The supercharger intake plenum
    • The bypass valve actuator for sticking or damage
    • The boost control solenoid for damage
    • The bypass valve lever for damage
    • The bypass valve cable for sticking, binding, out of adjustment, or damage-Refer to Supercharger Cleaning and Inspection .
  5. Engine running, observe the DTC information with a scan tool. DTC P2261 should not set.
  6. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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