This fault code 1679 DTCs document is a troubleshooting manual for the aftertreatment diesel exhaust fluid tank temperature fault. It explains the circuit, diagnostic conditions, fault effects, guided test steps, INSITE checks, connector inspections, calibration review, and clearing procedure for a 12-page PDF.
Official fault code 1679 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, with references also listing ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, and ISX15 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Aftertreatment Diesel Exhaust Fluid Tank Temperature Sensor |
| Publication no. | Not specified in the extract; associated bulletin numbers include 4022254, 4022257, 4022250, and 2883445 |
| Year/Revision | Last Modified: 11-Jun-2010 |
| Pages | 12 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 1679 – Aftertreatment Diesel Exhaust Fluid Tank Temperature – Data Erratic, Intermittent, or Incorrect
- 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 for sensor circuit fault codes.
- Guided Step 2 – Check the aftertreatment diesel exhaust fluid tank temperature sensor 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
The extract identifies the document as covering Cummins ISB6.7 CM2250 diagnostics and also lists associated procedures for ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, and ISX15 CM2250. The component location is OEM dependent because the diesel exhaust fluid tank and temperature sensor installation can vary by vehicle manufacturer; refer to the OEM service manual where directed. For manufacturer information, visit Cummins official website.
Who needs this fault code 1679 DTCs manual
This manual is for technicians diagnosing an amber CHECK ENGINE light or MIL caused by DEF tank temperature data that is erratic, intermittent, or incorrect. It is useful when checking Fault Code 1677 or 1678, inspecting sensor and controller connector pins, testing circuit response with INSITE™ electronic service tool, reviewing ECM calibration, or confirming the 10 hour cold soak clearing condition.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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