Cummins ISB4.5 CM2150 Fault Code: 1898 PID: SPN: 641 FMI: 13 VGT Actuator Controller – Out of Calibration.

Circuit Description
The variable geometry turbocharger (VGT) is electronic activated by the VGT actuator. The VGT actuator is a smart device that receives information via the J1939 data link from the primary engine 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.

Conditions for Running the Diagnostics
-This diagnostic runs 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 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 illuminates the amber CHECK ENGINE light and/or malfunction indicator lamp (MIL) immediately when the diagnostic runs and fails.
-VGT actuation will be disabled.

Conditions for Clearing the Fault Code
-To validate the repair, perform a key cycle. Note that the keyswitch must be completely turned OFF for more than 30 seconds before this diagnostic will run at initial key ON.
-The ECM will turn off the amber CHECK ENGINE lamp and enable VGT operation immediately after the diagnostic runs and passes.
-The ECM will turn off the MIL after 3 consecutive ignition cycles that the diagnostic runs and passes.
-This fault code and MIL can also be cleared with INSITE™ electronic service tool.

Possible Causes
-The gear alignment between the actuator and the turbocharger housing is misaligned.
-Foreign material in the VGT turbocharger may prevent the sliding nozzle from moving to the desired position at key ON.