This document is a fault code 1974 DTCs troubleshooting manual for crankcase pressure faults on CM2250 engines. It explains the sensor circuit, fault conditions, service checks, ECM calibration review, and INSITE™ clearing procedure. The file is useful when an amber CHECK ENGINE light is linked to crankcase pressure above normal operating range.
Official fault code 1974 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Crankcase Pressure Sensor Circuit |
| Publication no. | Not shown in the extract; associated bulletin numbers include 4022254, 4022257, 4022250, 2883445, 4022256, and 4022255 |
| Year/Revision | Last Modified: 11-Jun-2010 and 27-Jan-2011 |
| Pages | 8 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 1974
- 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 the fault codes.
- Guided Step 2 – Inspect the crankcase ventilation system.
- Guided Step 3 – Check ECM calibration and clear fault codes.
Applicable truck models
The extract identifies engine coverage for ISB6.7 CM2250 and also lists associated procedures for ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250. The fault is tied to the crankcase pressure sensor located in the crankcase filter assembly, with diagnostics running continuously when the engine is operating at low idle speed. For manufacturer information, visit Cummins official website.
Who needs this code 1974 DTCs manual
Workshop owners, fleet technicians, and diesel mechanics need this manual when INSITE™ shows SPN: 101, FMI: 16/16, or an active crankcase pressure fault. It supports checking maintenance records, inspecting breather oil drain tubes, check valves, breather tubes, and oil separator parts, then validating the repair below 7.0 in H20 at idle.
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