Cummins ISL9 Code 249 is a 6-page Cummins diagnostic procedure for ISL9 CM2350 (2013-17). The extract identifies Fault Code 249, SPN 171, FMI 3/3 and describes the reported condition as AMBIENT AIR TEMPERATURE SENSOR 1 CIRCUIT – VOLTAGE ABOVE NORMAL OR SHORTED TO HIGH SOURCE Ambient Air Temperature Sensor Circuit. This PDF is a workshop reference for confirming the recorded fault before repair decisions are made.
Official Cummins ISL9 Code 249 document details
| Brand | Cummins |
| Model coverage | ISL9 CM2350 (2013-17) |
| System / Group | Engine diagnostics |
| Publication no. | Fault Code 249 |
| Year / Revision | Not stated in extract |
| Pages | 6 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Circuit description
- Component location
- Diagnostic conditions
- Troubleshooting steps
- Fault-code clearing
Applicable truck models
This document is filed for ISL9 CM2350 (2013-17). Confirm the installed engine, ECM application, and vehicle configuration before applying the procedure, because the extract is a diagnostic reference rather than a vehicle-identification record. It concerns Fault Code 249; keep the displayed fault status and the document identification with the job record. Where the document directs the technician to use a diagnostic tool, wiring information, or manufacturer data, those supporting materials are part of a complete diagnosis. The PDF retains the source terminology and any printed SPN or FMI identifiers, helping distinguish this event from similarly named DTCs in the engine family. Consult Cummins official support for current product information.
Who needs this Cummins ISL9 Code 249 manual
Technicians investigating Fault Code 249 can use this ISL9 Code 249 reference to review the stated circuit or system, identify the conditions noted in the extract, and follow the documented checks in sequence. The procedure is also useful when a workshop needs a consistent record of Fault Code 249, SPN 171, FMI 3/3 before a component or harness decision is made.
Read the complete ISL9 Code 249 procedure before replacing parts. After the listed checks are complete, verify the repair and clear the fault only as the document specifies. The full PDF is available in the DiagTechPro manuals library; a free account is required to download it. This Cummins diagnostic procedure preserves the source context for later service review.
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