This document is a fault code 3143 DTCs troubleshooting manual for the aftertreatment SCR intake temperature sensor circuit. It explains the circuit description, fault conditions, lamp response, repair validation, and guided electrical checks used with INSITE™ electronic service tool.
Official fault code 3143 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, ISX15 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; aftertreatment SCR intake temperature sensor circuit |
| Publication no. | Not shown in extract; associated bulletin numbers include 4022254, 4022257, 4022250, and 2883445 |
| Year/Revision | Last Modified: 11-Jun-2010 |
| Pages | 17 |
| 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 3C – Check for a pin-to-pin short circuit in the aftertreatment SCR catalyst temperature interface module.
- Guided Step 4B – Check the circuit response.
Applicable truck models
This PDF applies to Cummins CM2250 engine platforms listed in the procedure tables: ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, and ISX15 CM2250. The fault concerns the aftertreatment SCR intake temperature sensor located between the diesel particulate filter and the SCR catalyst, where the ECM detects signal voltage below 0.13-VDC for more than 2 seconds. For official engine and service information, visit Cummins official website.
Who needs this fault code 3143 DTCs manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this code 3143 DTCs manual when an amber CHECK ENGINE lamp or MIL is active and INSITE™ shows SPN 4360 FMI 4. It supports connector inspection, sensor circuit response checks, interface module resistance checks, ECM harness testing, and calibration verification.
The file documents practical fault isolation for low signal voltage on the SCR intake temperature sensor circuit. Covered checks include loose connectors, corroded pins, bent or pushed-back pins, moisture, missing seals, wiring insulation damage, pin-to-pin shorts, shorts to ground, and interface module faults. The procedure also notes that DEF injection is disabled when the fault is active and engine torque can be reduced if operation continues for an extended period.
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