CM871 and CM876 Electronic Control Systems, ISX and ISM Engines – FAULT CODE 3616

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Overview

ISX – VGT Actuator Circuit SMALL | MEDIUM | LARGE

ISM – VGT Actuator Circuit SMALL | MEDIUM | LARGE

Circuit Description

The variable geometry turbocharger (VGT) is electronically activated by the VGT actuator. The VGT actuator is a smart device that receives information via the J1939 data link from the primary engine electronic control module (ECM). The VGT actuator performs its own diagnostics and reports errors back to the primary engine ECM using the J1939 data link.

Component Location

The VGT actuator is located on the turbocharger bearing housing. Refer to Procedure 100-002 in Section E.

Conditions for Running the Diagnostics

This diagnostic runs continuously when the keyswitch is initially turned to the ON position.

The keyswitch must be completely turned OFF for more than 30 seconds before this diagnostic will run at initial KEY ON.

Conditions for Setting the Fault Codes

The internal position reference is not detected during the initial power-on learn due to mechanical system binding or internal condition. The actual VGT actuator position is not known.

Action Taken When the Fault Code is Active

• The ECM logs the fault code immediately when the diagnostic runs and fails.

Conditions for Clearing the Fault Code

The keyswitch must be completely turned OFF for more than 30 seconds before this diagnostic will run at initial key-on.

The fault code will clear at KEY ON if the error condition no longer exists.

Shop Talk

Verify the ECM calibration is correct. Check the calibration revision history found on QuickServe™ Online for applicable corrections to the calibration stored in the ECM. If necessary, calibrate the ECM. Refer to Procedure 019-032 in Section 19.

This is an information fault code indicating that the VGT actuator was unable to go to the desired position at key-on. While active, the ECM will continuously attempt to restore normal VGT operation until the engine coolant temperature reaches 74°C [165°F].

If the condition continues to exist after the coolant reaches 74°C [165°F], Fault Code 2387 will become active and Fault Code 3616 will become inactive. Fault Code 2346 may set due to a resulting fueling derate.

Refer to Troubleshooting Fault Code t05-3616