This document is a Cummins 1684 fault code troubleshooting manual for the aftertreatment diesel exhaust fluid tank heater circuit. It explains the voltage below normal or shorted to low source condition, the circuit description, fault effects, clearing logic, and guided diagnostic steps used with INSITE™.
Official Cummins 1684 fault code document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, ISX15 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; aftertreatment diesel exhaust fluid tank heater circuit |
| Publication no. | Bulletin numbers referenced: 4022254, 4022257, 4022250, 2883445 |
| Year/Revision | Last Modified: 11-Jun-2010 |
| Pages | 11 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 1684
- 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 2 – Check the aftertreatment diesel exhaust fluid tank heater control valve and circuit.
- Guided Step 3 – Check the aftertreatment diesel exhaust fluid controller and harness.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
This file applies to CM2250 engine platforms listed in the procedure: ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, and ISX15 CM2250. The extract identifies the system as the aftertreatment diesel exhaust fluid tank heater circuit and notes that the tank heater control valve location varies by vehicle OEM, with the heating coil internal to the diesel exhaust fluid tank. More Cummins engine information is available from the Cummins official website.
Who needs this Cummins 1684 fault code manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this Cummins 1684 fault code manual when an amber CHECK ENGINE lamp or MIL is linked to SPN 3363 FMI 4. It supports checks for short to ground conditions, dirty or damaged pins, harness faults, a malfunctioning tank heater control valve, a malfunctioning aftertreatment diesel exhaust fluid controller, and ECM calibration status.
The procedure describes how Fault Code 1684 disables diesel exhaust fluid tank heating and can reduce engine torque if the engine is operated for an extended period with the fault active. It also shows how to validate repair by starting the engine and letting it idle for 1 minute, then using INSITE™ electronic service tool to confirm inactive status or clear faults where applicable.
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