This document is a Fault Code 111 DTCs troubleshooting sheet for an ECM microprocessor fault on ISB CM550 engine coverage. It explains the code identifiers, ECM location, fault behavior, and the decision steps used with a diagnostic tool. The file is a short PDF intended for fault confirmation, code clearing, and repair completion checks.
Official Fault Code 111 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; Electronic Control Module (ECM) Microprocessor |
| Publication no. | Not shown in the extract |
| Year/Revision | Unknown; document extract shows Copywrite 2017 |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 111
- PID: S254
- SPN: 629
- FMI: 12
- ELECTRONIC CONTROL MODULE (ECM) MICROPROCESSOR
- ECM Microprocessor
- DESCRIPTION
- COMPONENT LOCATION
- TROUBLESHOOTING STEPS
- Step 1A) Read the fault codes using the diagnostic tool
- Step 1B) Check the inactive counts of Fault Code 111
- Step 2A) Disable the fault code, start the engine, and verify inactive status
- Step 2B) Clear the inactive fault codes using the diagnostic tool
Applicable truck models
This PDF applies to Cummins ISB CM550 (1990-94) engine diagnostic coverage where Fault Code 111 is used for the Electronic Control Module (ECM) microprocessor. The extract identifies the ECM as located on the left side of the engine block, behind the fuel filter, but it does not list truck chassis, vehicle manufacturers, horsepower ratings, or separate calibration details. For official manufacturer information, visit Cummins official website.
Who needs this Fault Code 111 DTCs manual
Workshop owners, diesel mechanics, and diagnostic technicians need this Fault Code 111 DTCs manual when an ISB CM550 engine reports PID S254, SPN 629, FMI 12. The procedure is useful when confirming whether the fault is active or inactive, checking fault counts, deciding when ECM replacement is required, and clearing inactive codes after verification.
The document states that the ECM is responsible for engine control, diagnostics, and user features, and that this fault can be caused only by an internal ECM problem. It also states that ECM repairs are not possible, so the troubleshooting flow focuses on confirming the condition before replacement or before returning to the diagnostic steps. The process uses the key switch ON position, connected components, the diagnostic tool, engine idle verification for 1 minute, and final clearing of inactive fault codes. If Fault Code 111 remains active after the steps are completed and checked again, the document directs the user to return to troubleshooting or contact a local Cummins Authorized Repair Location.
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