This Cummins 3237 troubleshooting manual covers Fault Code 3237 for the aftertreatment diesel exhaust fluid line heater 1 circuit. It explains the voltage above normal or shorted to high source condition, the amber CHECK ENGINE lamp response, torque reduction risk, and the required INSITE™ validation steps.
Official Cummins 3237 troubleshooting manual document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also referenced for ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, and ISX15 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; aftertreatment diesel exhaust fluid line heater 1 circuit |
| Publication no. | Not stated for this PDF; associated bulletin numbers include 4022254, 4022257, 4022250, and 2883445 |
| Year/Revision | Last Modified: 11-Jun-2010 |
| Pages | 10 |
| 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 2 – Check the aftertreatment diesel exhaust fluid line heater 1 and circuit.
- Guided Step 3 – Check the aftertreatment diesel exhaust fluid controller and harness.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
This file applies to Cummins CM2250 engines listed in the procedure tables: ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, and ISX15 CM2250. The fault concerns aftertreatment diesel exhaust fluid line heater 1, located on the supply line between the diesel exhaust fluid dosing unit and diesel exhaust fluid dosing valve. For official engine and service information, visit Cummins official website.
Who needs this Cummins 3237 troubleshooting manual manual
Workshop owners, diesel technicians, and fleet mechanics need this 3237 troubleshooting manual when diagnosing SPN 4340 FMI 3, PID S254, or an amber lamp tied to DEF line heater voltage. The procedure supports connector inspection, heater resistance checks, controller harness short testing, ECM calibration review, and fault clearing with INSITE™ electronic service tool.
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