This fault code 1677 DTCs PDF is a troubleshooting document for the aftertreatment diesel exhaust fluid tank temperature sensor circuit. It explains the fault reason, diagnostic conditions, connector inspections, INSITE™ checks, repair decisions, calibration review, and final fault clearing steps for Cummins CM2250 engines.
Official fault code 1677 DTCs document details
| Brand | Cummins |
| Model coverage | ISB6.7 CM2250; also lists ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, and ISX15 CM2250 in the procedure references |
| System/Group | Aftertreatment Diesel Exhaust Fluid Tank Temperature Sensor Circuit / DTCs |
| 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 1677
- 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 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
This file is for Cummins CM2250 applications shown in the extract, including ISB6.7 CM2250, ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, and ISX15 CM2250 procedure references. The component location is OEM dependent because the aftertreatment diesel exhaust fluid temperature sensor is located in the diesel exhaust fluid tank, so the document directs users to the OEM service manual for tank and sensor location. See the manufacturer at Cummins official website.
Who needs this fault code 1677 DTCs manual
Workshop technicians need this manual when the amber CHECK ENGINE light or MIL is linked to SPN 3031 FMI 4/4 and low signal voltage at the DEF tank temperature sensor circuit. It supports diagnosis of possible signal shorts to ground, shorts to return, dirty or damaged pins, harness faults, controller response, and ECM calibration status.
The guided workflow uses keyswitch ON and OFF tests, INSITE™ electronic service tool fault-code checks, sensor disconnection, 86-pin controller connector inspection, and a 30-second circuit response check. It identifies when to clean connector pins, repair harness damage, replace the aftertreatment diesel exhaust fluid tank temperature sensor, repair or replace the controller harness, replace the aftertreatment diesel exhaust fluid controller, or calibrate the ECM under Procedure 019-032.
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