This document is a Cummins 2198 VGT fault troubleshooting manual for the VGT actuator driver circuit on CM2250 engines. It explains the fault overview, diagnostic conditions, INSITE™ checks, connector inspections, ECM calibration review, and clearing steps for Code 2198.
Official Cummins 2198 VGT fault document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, with associated listings for ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, QSL9 CM2250, QSB6.7 CM2250, and ISL8.9 CM2150 SN |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; VGT Actuator Driver Circuit |
| Publication no. | 4022254 for ISB6.7 CM2250; associated bulletin numbers include 4022250, 4022255, 4022256, 4022257, 4022190, and 2883445 |
| Year/Revision | Last Modified: 11-Jun-2010 and 20-Jul-2010 |
| Pages | 11 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes.
- Guided Step 2 – Check the VGT actuator circuit.
- Guided Step 3 – Check the ECM and engine harness.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
This file applies to Cummins CM2250 engine platforms listed in the procedure table, including ISB6.7 CM2250 and related ISX11.9, ISC8.3, ISL9, ISX15, QSL9, and QSB6.7 CM2250 applications. The diagnostic covers Fault Code 2198, PID S027, SPN 641, FMI 11/11, where intermittent communication between the smart VGT controller and the ECM is detected over the J1939 data link. The VGT actuator is located on the turbocharger bearing housing, and when the code is active, VGT actuation is disabled and the turbocharger moves to the default open position. See the manufacturer at Cummins official website.
Who needs this Cummins 2198 VGT fault manual
Workshop owners, diesel mechanics, and fleet technicians need this Cummins 2198 VGT fault document when diagnosing an amber CHECK ENGINE lamp or MIL related to VGT actuator communication. It is useful when checking INSITE™ fault status, inspecting VGT actuator connector pins, testing ECM response, reviewing engine harness connections, or confirming whether an ECM calibration update is required.
The procedure directs technicians to check for active Fault Code 2636, inspect for loose connectors, corroded pins, bent or broken pins, pushed back pins, moisture, damaged seals, dirt, broken shells, wire insulation damage, and locking tab problems. It also references Procedure 010-134 for the electric Variable Geometry Turbocharger Actuator, Procedure 019-031 for the Electronic Control Module, Procedure 019-032 for ECM Calibration Code, Procedure 019-043 for Engine Wiring Harness, and Procedure 019-361 for general inspection techniques.
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