P2565

DTC P2565 Turbocharger Boost Control Position Sensor High Voltage

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 nozzle position sensor is installed on the turbocharger assembly together with the control solenoid and made up of three individual hall element type sensors. The sensor has the following circuits.

^ Reference voltage circuit
^ Low reference circuit
^ Signal circuit

The ECM supplies reference voltage to the nozzle position sensor on the reference voltage circuit. The ECM also provides a ground on the low reference circuit. Each nozzle position sensor provides a low or high signal to the ECM on the signal circuits which is relative to the position changes of the nozzle angle. The nozzle position is determined by the combination of the three sensor signals. The three individual sensors and solenoids are named U phase V phase and W phase and there are six combinations when the system works properly.

^ U phase - V phase - W phase
^ High-Low-High
^ High-Low-Low
^ High - High - Low
^ Low-High-Low
^ Low - High - High
^ Low-Low-High

If the VNT control module detects all nozzle position sensor signals are stuck high 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.

Condition for Setting the DTC

^ The VNT control module detects all nozzle position sensor signal are stuck high.

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.

Circuit/System Testing DTC P2565