Cummins fault code 1688 is the Cummins Aftertreatment Diesel Exhaust Fluid Controller – Bad Intelligent Device or Component document for the ISX11.9 CM2250 (2010-12) engine platform, a 6-page PDF that reproduces the official fault code write-up read with Cummins INSITE. The aftertreatment diesel exhaust fluid controller is the central control for the SCR dosing system, handling dosing, tank level and temperature sensing, and line and tank heating, and it communicates with the ECM over J1939.
Official document details
| Brand | Cummins |
| Model coverage | Cummins ISX11.9, ISX15, ISB6.7, ISC8.3 and ISL9 CM2250 |
| System / group | ISX11.9 CM2250 (2010-12) / DTCs |
| Fault code | 1688 — PID None, SPN 3360, FMI 12 |
| Warning lamp | Amber |
| Publication reference | Cummins troubleshooting bulletin 2883445; procedure 011-057 |
| Pages | 6 |
| File size | 0.2 MB |
| Format | |
| Language | English |
What Cummins fault code 1688 means
It sets when the diesel exhaust fluid controller reports an internal error to the ECM over the data link. Aftertreatment diesel exhaust fluid dosing is disabled, and engine torque is reduced after extended operation. The document walks a technician through the summary and the guided troubleshooting steps needed to confirm and clear the code.
Document table of contents
- Overview and circuit description
- Component location
- Conditions for running the diagnostics
- Conditions for setting the fault code
- Action taken when the fault code is active
- Conditions for clearing the fault code
- Shop Talk and possible causes
- Associated procedures and guided troubleshooting steps
Applicable truck models
This troubleshooting document covers Cummins ISX11.9, ISX15, ISB6.7, ISC8.3 and ISL9 CM2250 engines in Class 6 to 8 trucks. It is filed under the ISX11.9 CM2250 (2010-12) / DTCs group and also applies to ISX12 CM2250 installations, so confirm the engine dataplate before ordering parts. Cross-reference the calibration revision with Cummins official engine support before clearing the code.
Who needs this Cummins fault code 1688 manual
Heavy-duty diesel technicians, fleet maintenance teams and workshop owners diagnosing a failed diesel exhaust fluid controller use this reference to read SPN 3360 / FMI 12 correctly and to follow the guided steps in INSITE. The possible causes it lists include:
- an internal failure of the diesel exhaust fluid controller, which is not serviceable and must be replaced when malfunctioning
The full 6-page PDF for diesel exhaust fluid controller fault code 1688 is available in the DiagTechPro manuals library; a free account is required to download.
Related manuals library
Sản phẩm liên quan cho hãng này
Cùng brand theo taxonomy hiện có trong catalog WooCommerce.
Cummins Calterm Version 5.16 – Advanced ECM Control and Precision Tuning for Cummins Engines
Cummins INSITE 9.3 – The Essential Diagnostic Tool for Cummins Engines
Cummins InCal CE – The Calibration and Configuration Tool for Cummins Engines
