This Cummins Fault 427 document is an 8-page troubleshooting PDF for SAE J1939 Data Link – Abnormal Update Rate diagnostics on CM2250 engines. It explains the circuit description, fault conditions, ECM communication checks, harness inspections, calibration review, and fault-code clearing with INSITE™ electronic service tool.
Official Cummins Fault 427 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, with associated coverage shown for ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISM11 CM876, ISZ13 CM2150, and GX CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; SAE J1939 Data Link Circuit |
| Publication no. | Not stated in the extract |
| Year/Revision | Last Modified: 04-Jan-2011; overview page last modified 11-Jun-2010 |
| Pages | 8 |
| 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 SAE J1939 communication.
- Guided Step 1A – Check for ECM communication with INSITE™ electronic service tool.
- Guided Step 1B – Inspect the OEM harness and ECM connector pins.
- Guided Step 1C – Check ECM communications with the ECM bench calibration harness.
- Guided Step 2 – Check ECM calibration and clear fault codes.
- Guided Step 2A – Check if an ECM calibration update is available.
- Guided Step 2B – Disable the fault code.
Applicable truck models
This file applies to Cummins CM2250 engine diagnostics where the ECM uses the SAE J1939 data link to communicate with OEM devices such as ABS controllers, autoshift transmissions, ASR systems, electronic displays, electronic information systems, electronic service tools, and vehicle electronic control unit(s). The file information identifies ISB6.7 CM2250, while the associated procedures table also lists ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISM11 CM876, ISZ13 CM2150, and GX CM2250 references for ECM Calibration Code Procedure 019-032. Manufacturer information is available at Cummins official website.
Who needs this Cummins Fault 427 manual
Workshop owners, diesel mechanics, and diagnostic technicians need this Cummins Fault 427 manual when an engine logs SPN 639 FMI 9/9 and the fault reason is lost communication on the SAE J1939 data link. The procedure is useful when checking ECM communication through a Cummins® INLINE™ II data link adapter, inspecting OEM harness and ECM connector pins, using an ECM bench calibration harness, comparing ECM code and revision number, and clearing the fault after the engine idles for 1 minute.
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