This Cummins 1682 DEF troubleshooting document is a Cummins fault-code procedure for Aftertreatment Diesel Exhaust Fluid Dosing Unit Input Lines – Condition Exists. It explains why the DEF dosing unit cannot prime, what the ECM does when the fault is active, and how INSITE™ is used to validate repair.
Official Cummins 1682 DEF troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also referenced for ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, and ISX15 CM2250 |
| System/Group | Aftertreatment Diesel Exhaust Fluid Dosing Unit Circuit / DTCs |
| Publication no. | 4022254 for ISB6.7 CM2250 associated procedures; other referenced bulletin numbers include 4022257, 4022250, and 2883445 |
| Year/Revision | Last Modified: 21-Dec-2010 and 23-Aug-2010 |
| Pages | 16 |
| 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 1A – Check for an active fault codes
- Guided Step 1B – Check for low diesel exhaust fluid tank level
- Guided Step 1C – Check for related fault codes
- Guided Step 5 – Check the aftertreatment diesel exhaust fluid dosing unit operation
- Guided Step 6B – Disable the fault code
Applicable truck models
This file applies to Cummins CM2250 engine platforms named in the procedure: ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, and ISX15 CM2250. The extract states that line routing varies by aftertreatment architecture and OEM, so vehicle installation details must be checked against the OEM service manual. The fault is SPN 3362 FMI 31 with an amber lamp, and it is related to the SCR system priming the diesel exhaust fluid dosing unit. Manufacturer information is available from Cummins official website.
Who needs this Cummins 1682 DEF troubleshooting manual
Workshop owners, diesel technicians, and fleet mechanics need this Cummins 1682 DEF troubleshooting manual when a CM2250 engine has Fault Code 1682 active or repeated inactive counts. It is useful for checking low DEF level, frozen or blocked lines, reversed suction and return lines, leaks that introduce air, a blocked tank filter, dosing unit operation, and ECM calibration status.
The procedure describes three DEF lines: the suction line between the tank and dosing unit, the pressure line between the dosing unit and dosing valve, and the return line between the dosing unit and tank. It also lists repair validation through the Diesel Exhaust Fluid Doser Override Test in INSITE™ under ECM Diagnostics Tests. When the fault is active, DEF injection is disabled, engine torque is severely reduced, and a second action level can limit vehicle speed to 8 km [5 mi] per hour after shutdown or extended idle conditions. Full PDF available in the DiagTechPro manuals library, free account required to download.
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