This Cummins 1843 fault code document is a Cummins diagnostic troubleshooting PDF for Fault Code 1843, covering the crankcase pressure circuit voltage above normal or shorted to a high source. It explains the ECM 5 volt supply, sensor return, crankcase pressure sensor signal, diagnostic conditions, fault clearing logic, and guided tests using INSITE™ electronic service tool. The file is intended for workshop use when an amber CHECK ENGINE lamp or MIL is related to SPN 101 FMI 3/3.
Official Cummins 1843 fault code document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also lists ISC8.3 and ISL9 CM2250, ISM11 CM876 SN, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250 in associated procedures |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; crankcase pressure sensor circuit |
| Publication no. | No single publication number shown; associated bulletin numbers include 4022254, 4022257, 4022196, 4022250, 2883445, 4022256, and 4022255 |
| Year/Revision | Last Modified: 11-Jun-2010 and 21-Jan-2011 |
| Pages | 16 |
| File size | 0.2 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.
- ECM Calibration
Applicable truck models
The extract identifies the main file group as ISB6.7 CM2250 and shows the procedure set across several Cummins CM2250 and related engine platforms: ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISM11 CM876 SN, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250. It applies to engines using a crankcase pressure sensor located in the crankcase filter assembly, where the ECM monitors signal voltage and sets Fault Code 1843 when the crankcase pressure signal voltage is greater than 4.75-VDC for more than 10 seconds. For official manufacturer information, visit Cummins official website.
Who needs this Cummins 1843 fault code manual
Mechanics, fleet technicians, and workshop owners need this file when diagnosing an active or inactive crankcase pressure circuit fault, checking for Fault Code 227, inspecting connector pins, testing 4.75 to 5.25-VDC supply voltage, or deciding whether the fault is in the sensor, engine harness, ECM connector, ECM, or calibration. It is also useful when documenting INSITE™ fault status changes after repair validation and engine idle clearing conditions.
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