This Cummins 1843 fault document is a troubleshooting PDF for Fault Code 1843 on CM2150 engines. It explains the crankcase pressure circuit, the voltage-above-normal condition, ECM response, INSITE checks, connector inspection, sensor testing, harness checks, ECM checks, and final fault-code clearing steps.
Official Cummins 1843 fault document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC, and ISL with CM2150; file information lists ISB6.7 CM2150 (2007-09) |
| System/Group | DTCs; Crankcase Pressure Sensor |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 14 |
| 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 4A – Disable the fault code.
- Guided Step 4B – Clear the inactive fault codes.
Applicable truck models
This file applies to Cummins ISB, ISC, and ISL engines with CM2150 control, with the library record identifying ISB6.7 CM2150 (2007-09). The document covers Fault Code 1843, PID P101, SPN 101, FMI 3/3, where the ECM detects crankcase pressure signal voltage greater than 4.8-VDC for more than 1 second. See the manufacturer at Cummins official website.
Who needs this Cummins 1843 fault manual
Use this manual when an amber CHECK ENGINE light is active for a high crankcase pressure circuit signal, or when a shop needs to separate a failed crankcase pressure sensor from harness, connector, supply, return, or ECM issues. It is written for technicians using INSITE™ electronic service tool and standard electrical checks.
The procedure starts by checking active and inactive fault codes, including Fault Code 227 sensor supply faults, then moves through crankcase pressure sensor connector inspection and circuit response testing. It includes supply and return voltage checks with the expected 4.75 to 5.25 VDC range, connector pin inspection points such as corroded pins, pushed back pins, damaged seals, moisture, debris, wire insulation damage, and broken locking tabs. Later steps inspect ECM and engine harness connector pins, test ECM response, identify possible pin-to-pin short circuits on the SIGNAL wire, and direct repair or replacement of the engine harness where required. The Cummins 1843 fault workflow ends by starting the engine, idling for 1 minute, verifying the fault is inactive, and clearing inactive fault codes with INSITE.
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