This Cummins 349 troubleshooting document is a 6-page fault code procedure for the auxiliary speed or auxiliary pressure input circuit on Cummins ISB CM550 engines. It identifies Fault Code 349 with PID P191, SPN 191, and FMI 0, then gives step-by-step checks for OEM auxiliary speed and pressure devices, sensor circuits, ECM connector pins, and final fault clearing.
Official Cummins 349 troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 |
| System/Group | DTCs; auxiliary speed or auxiliary pressure input circuit |
| Publication no. | Not stated in the extract |
| Year/Revision | Unknown; source page shows Copywrite 2017 |
| Pages | 6 |
| File size | 0.4 MB |
| Format | |
| Language | English |
Document table of contents
- Fault Code: 349
- PID: P191
- SPN: 191
- FMI: 0
- Auxiliary Speed or Auxiliary Pressure Input Error
- Description
- Component Location
- Troubleshooting Steps
- Step 1A: read the fault codes using the diagnostic tool
- Step 2A: refer to the OEM troubleshooting and repair manual for auxiliary device function
- Step 3A to 3E: auxiliary speed sensor connector, adjustment, resistance, ground short, and coil short checks
- Step 4A to 4B: auxiliary pressure sensor connector inspection and voltage check
- Step 5A to 5D: ECM and OEM harness inspection, open circuit, ground short, and pin-to-pin short checks
- Step 6A to 6B: disable the fault code, idle test, and clear inactive fault codes
Applicable truck models
This file applies to Cummins ISB CM550 engines in the ISB CM550 (1990-94) DTC group. The auxiliary speed or pressure pickup device location is OEM-dependent, so the procedure directs the technician to the OEM troubleshooting and repair manual for the installed equipment location and proper auxiliary device function. It covers applications where the auxiliary speed governor feature is enabled in calibration and set for speed or pressure according to the OEM application. Manufacturer information is available at Cummins official website.
Who needs this Cummins 349 troubleshooting manual
Workshop technicians, diesel diagnostic specialists, and fleet maintenance teams need this Cummins 349 troubleshooting manual when Fault Code 349 is active or inactive on an ISB CM550 engine. The checks support diagnosis of slipping clutches, broken driveline components, OEM pressure verification, auxiliary speed sensor adjustment, sensor resistance, harness continuity, ECM connector condition, and fault code clearing.
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