This Cummins 1942 fault code document is a troubleshooting PDF for crankcase pressure data that is erratic, intermittent, or incorrect. It explains the crankcase pressure sensor circuit, fault setting logic, INSITE™ checks, harness inspection, sensor replacement decision points, ECM calibration review, and fault clearing steps.
Official Cummins 1942 fault code document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, with associated coverage shown for ISC8.3 and ISL9 CM2250, ISM11 CM876 SN, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; crankcase pressure sensor |
| Publication no. | Associated bulletin number 4022254 for ISB6.7 CM2250; other associated bulletin numbers are listed by engine model |
| Year/Revision | Year unknown; extract shows Last Modified: 11-Jun-2010 and 24-Jan-2011 |
| Pages | 13 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 1942 – Crankcase Pressure – Data Erratic, Intermittent, or Incorrect
- 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 for sensor circuit fault codes
- Guided Step 1B – Check the crankcase filter tube (if equipped)
- Guided Step 2B – Check the circuit response
- Guided Step 3B – Check the circuit response
- Guided Step 4 – Check ECM calibration and clear fault codes
- Guided Step 4B – Disable the fault code
Applicable truck models
This document applies to Cummins engine platforms listed in the procedure table, including ISB6.7 CM2250 and related CM2250 applications where the crankcase pressure sensor is used to monitor pressure inside the crankcase. The extract identifies the sensor location in the crankcase filter assembly and notes the externally mounted crankcase filter option, including checks for the crankcase breather hose between the engine outlet and crankcase filter assembly. See the manufacturer website at Cummins official website.
Who needs this Cummins 1942 fault code manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this Cummins 1942 fault code manual when an amber CHECK ENGINE lamp or MIL is linked to SPN 101 FMI 2. It is useful before replacing parts because the guided steps separate sensor circuit faults, disconnected or restricted breather tubing, connector damage, high resistance, short circuits, ECM response, and calibration status.
The troubleshooting flow uses INSITE™ electronic service tool to read active fault codes such as 1843 and 1844, check circuit response after 30 seconds, inspect harness and ECM connector pins, and verify whether a calibration update exists. It also states that repair validation requires a key cycle, one minute with key ON, then engine idle for two minutes under the clearing conditions. Full PDF available in the DiagTechPro manuals library, free account required to download.
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