This Cummins fault code 1676 document is a diagnostic procedure for an aftertreatment exhaust gas temperature 2 fault on CM2150 engines. It explains how the ECM monitors the aftertreatment diesel particulate filter inlet temperature sensor, why the amber CHECK ENGINE light is set, and how regeneration is affected. The file is Code 1676.pdf, supplied as a 12-page English PDF for workshop reference.
Official Cummins fault code 1676 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC, and ISL with CM2150; file listing also identifies ISB6.7 CM2150 (2007-09) |
| System/Group | Aftertreatment Temperature Sensors / DTCs |
| Publication no. | Not shown in the extract |
| Year/Revision | Year unknown; last modified 20-Jul-2010 and 15-Sep-2010 |
| Pages | 12 |
| File size | 0.3 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 1 – Check for sensor circuit fault codes.
- Guided Step 2 – Check the aftertreatment diesel particulate filter inlet temperature sensor and circuit.
- Guided Step 3 – Check the ECM and OEM harness.
- Guided Step 4 – Clear the fault code.
Applicable truck models
This procedure applies to Cummins ISB, ISC, and ISL engines with CM2150 aftertreatment temperature sensors, including the ISB6.7 CM2150 (2007-09) grouping shown in the file information. The extract does not name specific truck makes or chassis models, so technicians should confirm OEM installation details in the original equipment manufacturer service manual. Official manufacturer information is available from Cummins official website.
Who needs this Cummins fault code 1676 manual
This manual is for diesel mechanics, fleet technicians, and workshop owners diagnosing SPN 3249 FMI 2/2, where the aftertreatment diesel particulate filter inlet temperature sensor reading is erratic, intermittent, or incorrect. It is useful when active aftertreatment diesel particulate filter regeneration is disabled and INSITE™ electronic service tool checks are required.
The troubleshooting flow directs technicians to check for Fault Code 1674 or 1675, inspect the aftertreatment diesel particulate filter inlet temperature sensor connector, and test circuit response with the sensor disconnected. It also covers jumper-wire response checks between the SIGNAL and RETURN pins, ECM and OEM harness connector inspection, pin-to-pin short circuit testing, and pin-to-ground short circuit testing. Resistance specifications shown in the procedure include greater than 100k ohms for harness short checks. Repair paths include cleaning or repairing damaged connectors, replacing the sensor, repairing or replacing the OEM harness, or calling for authorization before ECM replacement.
Verification uses INSITE™ Data Monitor/Logger to compare the aftertreatment diesel oxidation catalyst inlet temperature with the aftertreatment diesel particulate filter inlet temperature. The readings must be within 24°C or 43°F of each other, and the engine must run for 15 minutes with the diesel oxidation catalyst inlet temperature above 150°C [302°F] before the fault can clear. Full PDF available in the DiagTechPro manuals library, free account required to download.
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