This Cummins 1688 fault code troubleshooting document explains Fault Code 1688 for the aftertreatment diesel exhaust fluid controller. It covers the circuit description, diagnostic conditions, ECM actions, clearing criteria, INSITE™ checks, calibration review, and replacement guidance for the DEF controller.
Official Cummins 1688 fault code document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also references ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, and ISX15 CM2250 in the troubleshooting text |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Aftertreatment Diesel Exhaust Fluid Controller Circuit |
| Publication no. | Bulletin 4022254 for ISB6.7 CM2250 associated procedures; other referenced bulletins include 4022257 and 4022250 |
| Year/Revision | Last Modified: 11-Jun-2010; troubleshooting section Last Modified: 25-Sep-2009 |
| Pages | 6 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 1688
- 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 1A – Read the fault codes.
- Guided Step 2 – Check ECM calibration and clear fault codes.
- Guided Step 2A – Check if an ECM calibration update is available.
- Guided Step 2B – Disable the fault code.
Applicable truck models
The file is listed for Cummins ISB6.7 CM2250 DTCs, with the circuit heading also naming ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, and ISX15 CM2250. The procedure applies to the aftertreatment diesel exhaust fluid controller, a non-serviceable SCR diesel exhaust fluid dosing system controller that communicates with the ECM through a J1939 data link. Component location varies by application and OEM, and the extract directs technicians to the OEM service manual for exact mounting location. See the manufacturer’s official information at Cummins official website.
Who needs this Cummins 1688 fault code manual
This 1688 fault code manual is useful for diesel mechanics, fleet workshops, and diagnostic technicians dealing with an active SPN 3360 FMI 12 amber lamp complaint. It helps confirm whether Fault Code 1688 is active, whether an ECM Calibration Code update is available, and when to replace the aftertreatment diesel exhaust fluid controller under Procedure 011-057.
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