This document is a Cummins 2634 VGT actuator troubleshooting manual for Fault Code 2634 on CM2250 engines. It explains the VGT smart actuator circuit, fault conditions, lamp response, aftertreatment effects, connector inspection, ECM calibration checks, and clearing steps.
Official Cummins 2634 VGT actuator document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; VGT Actuator Circuit |
| Publication no. | 4022254 for ISB6.7 CM2250; other listed bulletins include 4022257, 4022250, 2883445, 4022256, and 4022255 |
| Year/Revision | Last modified 11-Jun-2010 and 20-Jul-2010 |
| Pages | 10 |
| 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 VGT actuator installation.
- Guided Step 2 – Check the VGT actuator.
- Guided Step 3 – Check for progressive damage.
- 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: ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250. The document identifies Fault Code 2634, PID S027, SPN 641, and FMI 12/12 as a VGT Actuator Controller – Bad Intelligent Device or Component condition, where the VGT actuator has detected an internal error and reports it to the primary engine ECM through the J1939 data link. For manufacturer information, visit Cummins official website.
Who needs this Cummins 2634 VGT actuator manual
Workshop owners, diesel mechanics, fleet technicians, and diagnostic tool users need this 2634 VGT actuator manual when a red STOP ENGINE lamp or MIL is linked to VGT actuation being disabled. The procedure is useful when checking whether the actuator was removed with the keyswitch ON, inspecting loose or corroded connector pins, testing for progressive aftertreatment damage, checking active aftertreatment-related fault codes, or confirming whether an ECM calibration update is available.
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