This Cummins 1844 troubleshooting document is a diagnostic procedure for Fault Code 1844 on CM2150 engines. It explains a low-voltage crankcase pressure sensor signal fault, the ECM response, likely wiring causes, and guided checks using INSITE™ electronic service tool.
Official Cummins 1844 troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC, and ISL with CM2150; file group lists ISB6.7 CM2150 (2007-09) |
| System/Group | DTCs; crankcase pressure sensor and crankcase pressure circuit |
| Year/Revision | Last Modified: 20-Jul-2010; year unknown |
| Pages | 15 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- 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 – Check the crankcase pressure sensor and circuit.
- Guided Step 3 – Check the ECM and engine harness.
- Guided Step 4 – Clear the fault code.
Applicable truck models
This file applies to Cummins ISB, ISC, and ISL engines with CM2150 control, with the library group identifying ISB6.7 CM2150 (2007-09). The extract does not name truck makes or chassis models, so coverage should be matched by engine family, ECM type, and active DTC information rather than vehicle badge. The sensor covered is located in the crankcase filter assembly, and the diagnostic refers to Procedure 100-002 for detailed component location. For manufacturer information, visit Cummins official website.
Who needs this Cummins 1844 troubleshooting manual
Workshop owners, diesel mechanics, and diagnostic technicians need this file when an amber CHECK ENGINE light appears with Fault Code 1844, PID P101, SPN 101, FMI 4/4. The procedure is useful for checking sensor supply fault codes, inactive or intermittent faults, connector condition, 4.75 to 5.25 VDC supply voltage, circuit response, ECM connector pins, and whether the engine harness or ECM requires repair or replacement authorization.
This Cummins 1844 troubleshooting PDF helps separate a failed crankcase pressure sensor circuit from harness, connector, supply, return, signal, or ECM response issues. The full PDF is available in the DiagTechPro manuals library, free account required to download.
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