The Cummins M11 code 155 troubleshooting document is a 2-page factory-style fault code guide covering the intake air temperature engine protection (PID P105, SPN 105, FMI 0) on Cummins CELECT engines. The intake manifold air temperature sensor lets the ECM monitor engine intake air temperature for the engine protection system and for timing and fuelling control. It reproduces the circuit description, component location and the full step-by-step diagnostic procedure a technician follows to confirm the fault and verify the repair. The guide moves through connector inspection, harness continuity and resistance measurements, sensor and ECM checks, and then explains how to disable, re-run and clear the code once the repair has been confirmed on a diagnostic tool.
Cummins M11 code 155 document details
| Brand | Cummins |
| Model coverage | M11 CELECT (1990-94) |
| System / Group | Intake Air Temperature Engine Protection |
| Fault code identifiers | Fault Code 155 · PID P105 · SPN 105 · FMI 0 · Engine lamp · SRT None |
| Source publication | TruckFaultCodes.com (Copyright 2017) |
| Year / Revision | 1990-94 platform |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Circuit Description
- Component Location
- Troubleshooting Steps
- Fault Code Verification and Clearing
Applicable truck models
This procedure applies to trucks running Cummins M11 CELECT (1990-94) with CELECT electronic controls. Technicians should confirm the engine dataplate and ECM calibration first, and cross-check every pin and connector location against the OEM wiring diagram, because connector positions vary with the chassis manufacturer. For engine-level specifications and authorised repair locations, see the Cummins official engine support site.
Who needs this Cummins M11 code 155 manual
This M11 code 155 manual is written for heavy-duty diesel technicians, fleet maintenance staff and workshop owners who want a repeatable diagnostic path instead of guesswork. It suits anyone reading Fault Code 155 as an active or inactive code and wanting to inspect the intake manifold air temperature circuit, take the specified resistance and voltage readings, and confirm the ECM and harness before replacing parts.
Applies to these truck models
This is the manufacturer document shared across 2 model families. It applies to:
- Cummins DTCs
- Cummins M11 CELECT (1990-94)
Related manuals library
The complete Cummins Fault Code 155 PDF (2 pages) is available in the DiagTechPro manuals library; a free account is required to download the full document.
