This Cummins 1898 troubleshooting document covers Fault Code 1898 for the VGT actuator controller out of calibration condition. It explains the VGT Actuator Circuit, fault-code behavior, INSITE™ checks, actuator inspection, turbocharger movement checks, ECM calibration review, and fault clearing steps.
Official Cummins 1898 troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also lists ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250 in associated procedures |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; VGT Actuator Circuit |
| Publication no. | Not shown in the extract; associated bulletin numbers include 4022254, 4022257, 4022250, 2883445, 4022256, and 4022255 |
| Year/Revision | Last Modified: 11-Jun-2010 and 20-Jul-2010 |
| Pages | 14 |
| 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
- Step 1 – Check the fault codes.
- Guided Step 2 – Check the VGT actuator.
- Guided Step 3 – Check aftertreatment system.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
This file applies to Cummins CM2250 engine troubleshooting for Fault Code 1898, with the file group identified as ISB6.7 CM2250 (2010-12) / DTCs. The associated procedures table also names ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250, so the document is relevant where these engines use the listed Variable Geometry Turbocharger Actuator, Electric and related CM2250 diagnostic procedures. For official brand information, see Cummins official website.
Who needs this Cummins 1898 troubleshooting manual
Workshop owners, diesel technicians, and fleet mechanics need this Cummins 1898 troubleshooting manual when an amber CHECK ENGINE light or MIL is linked to SPN 641 FMI 13/13 and the VGT actuator fails its automatic calibration procedure at initial key ON. It is useful before replacing parts because the steps separate inactive faults, connector or pin damage, broken actuator gear issues, turbocharger sector gear binding, aftertreatment progressive damage, and ECM calibration requirements.
The procedure states that Fault Code 1898 can be logged when actuator-to-turbo gear alignment is misaligned or when foreign material prevents the sliding nozzle from moving to the desired position. It also notes that VGT actuation will be disabled, intake manifold pressure can be low, and the VGT will be in the open position. Diagnostic validation requires a key cycle, engine start, and idle for 5 minutes under the listed clearing conditions.
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