This Cummins 2346 fault troubleshooting document explains Fault Code 2346 for CM2150 engines and the calculated turbocharger turbine inlet temperature condition. It identifies the code reason, ECM response, clearing conditions, and INSITE™ checks used to confirm that no repair is normally required.
Official Cummins 2346 fault troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC, and ISL with CM2150; ISB6.7 CM2150 (2007-09) |
| System/Group | DTCs; Electronic Control Module |
| Publication no. | Not shown in extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 5 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- FAULT CODE 2346
- 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 turbocharger fault codes.
- Guided Step 2 – Clear the fault code.
- Guided Step 2A – Disable the fault code.
- Guided Step 2B – Clear the inactive fault codes.
Applicable truck models
This file applies to Cummins ISB, ISC, and ISL engines with the CM2150 electronic control module, including the ISB6.7 CM2150 (2007-09) DTC group shown in the file information. The extract does not list specific truck chassis, but it notes that some original equipment manufacturers may install pyrometer gauges that read turbine outlet temperature, which will not match the INSITE™ exhaust gas temperature parameter. For manufacturer information, visit Cummins official website.
Who needs this Cummins 2346 fault troubleshooting manual
Workshop owners, diesel technicians, and fleet mechanics use this Cummins 2346 fault troubleshooting manual when Fault Code 2346 is active or has high inactive counts. The procedure helps confirm whether the engine derated because calculated turbocharger turbine inlet temperature exceeded the protection limit, and it directs users to INSITE™ steps for reading, disabling, and clearing the inactive fault code.
The document states that exhaust gas temperature is calculated by the ECM from operating conditions such as intake manifold air temperature, engine speed, injection timing, intake manifold pressure, and fuel flow. It also explains that there is no physical exhaust gas temperature sensor in this system, because the value represents calculated turbine inlet temperature before the turbocharger.
Shop Talk advises verifying the ECM calibration and checking QuickServe® Online calibration revision history for applicable fixes. It also states that Fault Code 2346 is an information fault code, that normal operation may limit fuel to reduce exhaust temperature, and that no troubleshooting is necessary when the derate event is the only issue. If the condition continues, Fault Code 2451 may become active.
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