P0045

DTC P0045 Turbocharger Boost Control Solenoid Control Circuit

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. When the engine is not under load the turbocharger nozzles are in an open position or no boost condition. When the engine is under load the VNT control module commands the control solenoid to close the turbocharger nozzles thus increasing the boost. The ECM will vary the boost dependant upon the load requirements of the engine. The VNT control module has the ability to perform internal diagnostics for voltage and signal input and output status. If the VNT control module detects an error in the solenoid control signal or VNT control module voltage error the VNT control module will send a message to the ECM via the controller area network (CAN) communication bus and sets this DTC.

Condition for Running the DTC

^ The battery voltage is between 10 to 16 volts.
^ The ignition switch is ON, or during the stroke check when the ignition is switched from ON to OFF.

Condition for Setting the DTC

Either of following condition is met:

^ The VNT control module detects system voltage is more than 18 volts.
^ The VNT control module detects an open circuit short to ground or short to voltage circuit on the solenoid circuit.
^ The VNT control module detects that the VNT solenoid commanded duty ratio is more than 95%.

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 an intermittent condition is suspected refer to intermittent conditions in this section.
^ A sticking or intermittently sticking the turbocharger nozzle control actuator may set this DTC.
^ A charging system problem may set this DTC.
^ Jump starting the vehicle may set this DTC.

Circuit System Testing DTC P0045