This Cummins code 146 document is a troubleshooting manual for Fault Code 146 on CM2250 engines. It covers the engine coolant temperature sensor circuit, warning limits, ECM response, INSITE™ checks, calibration review, and fault clearing steps.
Official Cummins code 146 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also lists ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, QSL9 CM2250, QSB6.7 CM2250, GX CM2250, ISF2.8 CM2220, ISF3.8 CM2220, ISB4.5, ISD4.5, ISD6.7 CM2150 SN, and ISL8.9 CM2150 SN in associated procedures. |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Engine Coolant Temperature Sensor Circuit |
| Publication no. | Associated bulletin numbers include 4022254, 4022257, 4022250, 2883445, 4022256, 4022255, 4022178, 4021704, 4022188, and 4022190. |
| Year/Revision | Last Modified: 11-Jun-2010; troubleshooting section Last Modified: 18-Jan-2011 |
| Pages | 7 |
| 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 – Monitor coolant temperature reading.
- Guided Step 1A – Monitor coolant temperature reading.
- 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
The file applies to Cummins engines listed in the fault-code procedure, with the shop listing focused on ISB6.7 CM2250. The extract also names ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, QSL9 CM2250, QSB6.7 CM2250, GX CM2250, ISF2.8 CM2220, ISF3.8 CM2220, ISB4.5, ISD4.5, ISD6.7 CM2150 SN, and ISL8.9 CM2150 SN through the associated procedure table. For official manufacturer information, visit Cummins official website.
Who needs this Cummins code 146 manual
Workshop technicians need this Cummins code 146 manual when an amber CHECK ENGINE lamp appears for Engine Coolant Temperature – Data Valid But Above Normal Operational Range – Moderately Severe Level. It is useful when verifying coolant temperature against a mechanical gauge, replacing the coolant temperature sensor under Procedure 019-019, checking ECM calibration under Procedure 019-032, or clearing the fault with INSITE™ electronic service tool.
The document states that the ECM detects coolant temperature greater than 108° C [226°F] for more than 5 seconds, then reduces torque output and disables EGR valve operation while the fault is active. The full PDF is available in the DiagTechPro manuals library, free account required to download.
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