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Home >> Cadillac >> 2006 >> STS V >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 4.4L - DTC P0506 To P2544 >> DTC P2261 >> Circuit/System Verification

Circuit/System Verification

  1. If DTCs P0101, P0106, P0107, P0108, P0641, P0651, P1182, P1183, P1184 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 .
  4. 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.
  5. 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 .