This 8-page PDF is a fault code 3713 DTCs troubleshooting guide covering the aftertreatment diesel exhaust fluid (DEF) line heater relay diagnostic for CM2250-controlled engines. It provides the fault code description, conditions for setting and clearing the code, and a complete guided troubleshooting procedure with resistance specifications and harness inspection steps.
Official fault code 3713 DTCs document details
| Brand | Cummins |
| Model coverage | ISB6.7 CM2250, ISC8.3 CM2250, ISL9 CM2250, ISX11.9 CM2250, ISX15 CM2250, ISF2.8 CM2220, ISF3.8 CM2220, GX CM2250 |
| System/Group | Aftertreatment — Diesel Exhaust Fluid Line Heater Relay (DTC / SPN 5491, FMI 7) |
| Publication no. | — |
| Year/Revision | Last modified 28-Dec-2010 |
| Pages | 8 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview — Circuit Description and Component Location
- Fault Code 3713 Summary — Code, Reason, Effect (PID S254, SPN 5491, FMI 7, Amber Lamp)
- Action Taken When the Fault Code is Active
- Conditions for Running the Diagnostics / Setting the Fault Code / Clearing the Fault Code
- Shop Talk — Possible Causes
- Associated Procedures Table (ECM Calibration Code — Procedure 019-032 per engine model)
- Step 1 — Check the Fault Codes (Step 1A: active fault code verification)
- Step 2 — Check the Aftertreatment DEF Line Heater Relay (Step 2A: connector and pin inspection; Step 2B: pin-to-pin short circuit resistance test — less than 100k ohms threshold)
- Step 3 — Check ECM Calibration and Clear Fault Codes (Step 3A: calibration update check; Step 3B: disable and clear fault code)
Applicable truck models
This document applies to vehicles equipped with Cummins ISB6.7 CM2250, ISC8.3 CM2250, ISL9 CM2250, ISX11.9 CM2250, ISX15 CM2250, and GX CM2250 engines, as well as the ISF2.8 and ISF3.8 CM2220 platforms. The DEF line heater relay location is OEM-dependent, so this guide references OEM service manuals for physical component placement. Fault code 3713 indicates a short circuit to battery on the DEF line heater power supply circuit, which disables line heaters 1, 2, and 3 and may trigger engine torque reduction. The troubleshooting procedure requires the INSITE™ electronic service tool. For additional Cummins technical resources, visit Cummins official website.
Who needs this fault code 3713 DTCs manual
Diesel technicians and workshop owners diagnosing an amber CHECK ENGINE or MIL lamp caused by SPN 5491 / FMI 7 on CM2250 or CM2220 aftertreatment systems will use this guide. It walks through relay inspection, resistance measurement between pin 30 and pin 87, harness repair decisions, and ECM calibration verification — all required to resolve the fault and restore DEF heating.
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