P003A

DTC POO3A Turbocharger Boost Control Position Not Learned

Circuit Description

The position of the turbocharger nozzle is controlled by the variable nozzle turbocharger (VNT) control module based on the command from the ECM. The VNT control module controls a drive signal to the turbocharger nozzle control solenoid (installed to the turbocharger assembly) by utilizing position sensor inputs to control the turbocharger nozzles. After the ignition switch is cycled the VNT control module learns nozzle operational angle by controlling the solenoid. If the VNT control module detects that the learned nozzle angle is not within a predetermined range the VNT control module will send a message to the ECM via the controller area network (CAN) communication bus and sets this DTC. This diagnostic will only run once per driving cycle within the enabling conditions.

Condition for Running the DTC

^ The battery voltage is between 10 to 16 volts.
^ The ignition switch is ON.

Condition for Setting the DTC

^ The VNT control module detects that the learned nozzle operational angle is too small or too wide

Action Taken When the DTC Sets

^ The ECM illuminates the MIL when the diagnostic runs and fails. Refer to DTC Type Definitions for Action Taken When the DTC Sets - Type A.
^ The ECM limits fuel injection quantity.
^ The ECM inhibits EGR control.
^ The ECM inhibits turbocharger control.
^ The ECM inhibits DPF regeneration control.
^ The ECM inhibits cruise control.

Condition for Clearing the DTC

^ Refer to DTC Type Definitions for Condition for Clearing the MIL/DTC - Type A.

Diagnostic Aids

^ If this DTC is set the Turbocharger (TC) Vane Position Learned Operational Angle in the Turbocharger Datalist on the Scan tool will fall outside of 79 to 860. In order to update this parameter turn OFF the ignition for 1 minute then turn the ignition back ON. The ECM will fully move the turbocharger vanes shortly after the ignition is turned OFF and the updated parameter can then be viewed on the next ignition cycle.
^ If an intermittent condition is suspected refer to intermittent conditions in this section.
^ A sticking or intermittently sticking turbocharger nozzle control actuator may set this DTC.

Circuit System Testing DTC P003A