U010C

DTC UO1OC Turbocharger CAN Communication

Circuit Description

The ECM and the variable nozzle turbocharger (VNT) control module communicate control and diagnostic information via a controller area network (CAN) communication bus. The ECM monitors CAN operational status by expecting a constant flow of messages from the VNT control module. If the ECM fails to send or receive an expected message from the VNT control module this DTC will set.

Condition for Running the DTC

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

Condition for Setting the DTC

Either of following condition is met:
^ The VNT control module received an error CAN Bus messages from the ECM.
^ The ECM detects that the CAN Bus messages from the VNT control module are not being received.

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 UO1OC