This Cummins 3146 troubleshooting document covers Fault Code 3146 for the aftertreatment SCR outlet temperature sensor circuit. It explains the voltage-above-normal condition, the ECM response, likely circuit causes, and guided diagnostic checks using INSITE™ electronic service tool.
Official Cummins 3146 troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Aftertreatment SCR Outlet Temperature Sensor Circuit |
| Publication no. | Not stated in the file extract; associated bulletin numbers include 4022254, 4022257, 4022250, and 2883445 |
| Year/Revision | Unknown; last modified dates shown include 21-Dec-2010 and 11-Jun-2010 |
| Pages | 18 |
| 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 2B – Check the circuit response.
- Guided Step 3B – Check for an open circuit in the aftertreatment SCR catalyst temperature interface module.
- Guided Step 4 – Check the ECM, engine harness, and OEM harness.
- Guided Step 4D – Check for a pin to pin short circuit in the engine harness or OEM harness.
- Guided Step 5B – Disable the fault code.
Applicable truck models
This file applies to Cummins CM2250 engine platforms listed in the extract: ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, and ISX11.9 CM2250. The fault is for SPN 4363 FMI 3, where the ECM detects the SCR catalyst outlet temperature sensor signal voltage above 4.4-VDC for more than 2 seconds. The sensor is located after the SCR catalyst in the aftertreatment system, and the document states that diesel exhaust fluid injection is disabled when the fault is active. For manufacturer information, visit Cummins official website.
Who needs this Cummins 3146 troubleshooting manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this manual when an amber CHECK ENGINE lamp or MIL is linked to the Aftertreatment SCR Outlet Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source. It is useful for checking connector damage, open signal circuits, pin-to-pin shorts, interface module faults, ECM calibration status, and the final fault clearing process.
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