This fault code 1682 DTCs document is a service manual excerpt for diagnosing aftertreatment DEF dosing unit input line conditions. It explains why SPN 3362 FMI 31 sets, what the amber lamp response means, and how DEF injection into the SCR aftertreatment system is disabled until the repair is validated. The file covers both air-assisted and airless SCR dosing configurations.
Official fault code 1682 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB4.5, ISB6.7, ISD4.5, ISD6.7 CM2150 SN; ISL8.9 CM2150 SN; ISZ13 CM2150; ISM11 CM876 SN; ISF2.8 CM2220 AN; ISF3.8 CM2220 AN |
| System/Group | ISB6.7 CM2150 (2007-09) / DTCs; Aftertreatment DEF Dosing System; Aftertreatment Diesel Exhaust Fluid Dosing Unit Circuit |
| Year/Revision | Last modified 17-Jan-2011, 07-Jan-2011, and 03-Feb-2011 in the extracted sections |
| Pages | 7 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- FAULT CODE 1682 (Air-assisted)
- 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
- Priming
- Dosing
- Purging
- FAULT CODE 1682 (Airless)
- Fault Code Path Selection
Applicable truck models
This document applies to Cummins engines and SCR aftertreatment systems named in the extract: ISB4.5, ISB6.7, ISD4.5, ISD6.7 CM2150 SN, ISL8.9 CM2150 SN, ISZ13 CM2150, ISM11 CM876 SN, ISF2.8 CM2220 AN, and ISF3.8 CM2220 AN. Vehicle installation and DEF dosing unit location are OEM dependent, so line routing and component access must be checked against the OEM service manual for the truck. For official manufacturer information, visit Cummins official website.
Who needs this fault code 1682 DTCs manual
Workshop owners, diesel technicians, and fleet mechanics need this file when a truck has an amber CHECK ENGINE lamp or MIL with DEF dosing disabled and reduced engine torque. It is also useful when verifying priming, dosing, purging, air pressure, DEF line condition, nozzle restriction, line heater function, and INSITE Diesel Exhaust Fluid Doser Override Test results.
The air-assisted section explains the DEF dosing unit cycles: priming at engine start, dosing after priming, and purging after key OFF. It lists failure modes such as low DEF level, low air pressure, blocked or frozen DEF lines, restricted nozzle, plugged inline air filter, incomplete purge, crystal buildup, internal pressure sensor failure, poppet valve failure, inlet check valve contamination, and a restricted inlet connector strainer. The airless section identifies inability to prime after multiple attempts and mentions faults caused by frozen DEF, kinked or disconnected pressure and suction lines, and a malfunctioning DEF dosing unit. The full PDF is available in the DiagTechPro manuals library, free account required to download.
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