This document is a fault code 1943 DTCs troubleshooting manual for diagnosing Ambient Air Density data below the normal operational range. It explains how the ECM uses ambient air pressure or turbocharger compressor intake pressure data, why torque can be reduced at high altitude, and how INSITE™ is used to validate the condition.
Official fault code 1943 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, with associated coverage shown for ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISM11 CM876, and GX CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs |
| Publication no. | Bulletin 4022254 is listed for ISB6.7 CM2250 associated procedures |
| Year/Revision | Unknown; extract shows last modified dates of 11-Jun-2010 and 18-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
- 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 1A – Check for active fault codes.
- Guided Step 1B – Check for inactive fault codes.
- Guided Step 1C – Check the barometric pressure sensor reading.
- Guided Step 1D – Check the turbocharger compressor inlet and turbocharger compressor outlet temperatures in the Fault Code 1943 Snapshot Data.
- Guided Step 2 – Check ECM calibration and clear fault codes.
- Guided Step 2A – Check if an ECM calibration update is available.
- Guided Step 2B – Disable the fault code.
Applicable truck models
This fault code 1943 DTCs document applies to CM2250 engines identified in the extract, including ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, ISX15 CM2250, and GX CM2250, with an associated ISM11 CM876 listing. The procedure is centered on ECM monitoring of ambient air pressure, barometric pressure sensor input, and turbocharger compressor intake pressure/temperature sensor data. It also references Fault Codes 221 or 249, ECM Calibration Code Procedure 019-032, Barometric Air Pressure Sensor Procedure 019-004, and Turbocharge Compressor Intake Pressure/Temperature Sensor Procedure 019-466. For manufacturer information, visit Cummins official website.
Who needs this fault code 1943 DTCs manual
Workshop owners, diesel technicians, and fleet mechanics need this file when an engine logs SPN 3555 FMI 1/17 with the description Ambient Air Density – Data Valid But Below Normal Operational Range – Least Severe Level. The manual helps confirm whether the event is an information-only high altitude condition, a sensor reading issue, a temperature snapshot issue requiring OEM contact, or an ECM calibration update task.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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