For a complete wiring diagram Refer to Section 8WPossible CausesTURBOCHARGER BOOST PRESSURE SENSOR CALIBRATION1. BOOST PRESSURE SENSOR CALIBRATIONTurn the ignition on.With the scan tool, read the Boost Pressure Voltage and Boost Pressure hpa.The Boost Pressure hpa and Intake/Inlet Air Pressure hpa readings should both match closely to the Atmoshperic Pressure hpa reading. These readings will change depending on altitude.Is the Boost Pressure Voltage between 1.12 and 1.36 volt?YesTest Complete.NoReplace the Turbocharger Boost Pressure Sensor.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)