ISX12/ISX11.9 CM2250 Fault Code: 3651 | SPN: 3031 | FMI: 18Aftertreatment 1 Diesel Exhaust Fluid Tank Temperature – Data Valid But Below Normal Operating Range – Moderately Severe Level

Overview

Circuit Description

The aftertreatment diesel exhaust fluid tank temperature sensor is used to monitor the temperature of the aftertreatment diesel exhaust fluid inside the aftertreatment diesel exhaust fluid tank.

Component Location

The aftertreatment diesel exhaust fluid tank temperature sensor is located in the diesel exhaust fluid tank. Location of the tank and temperature sensor is OEM dependent. Refer to the OEM service manual.

Conditions for Running the Diagnostics

This diagnostic runs when the diesel exhaust fluid tank temperature is being maintained by using the diesel exhaust fluid tank heater or when line heating is being requested.

Conditions for Setting the Fault Codes

The diesel exhaust fluid tank was not able to maintain the proper temperature and was in danger of freezing.

The diesel exhaust fluid lines, tank, or dosing unit were not able to heat up.

Action Taken When the Fault Code is Active

• The ECM illuminates the amber CHECK ENGINE lamp and/or the malfunction indicator lamp (MIL) immediately when the diagnostic runs and fails.
• The diesel exhaust fluid dosing unit will purge itself, and diesel exhaust fluid injection into the aftertreatment system is disabled.

Conditions for Clearing the Fault Code

• Turn the keyswitch OFF. Allow the ECM to completely power down and turn the keyswitch ON.
• The fault code status in the recommended Cummins® electronic service tool or equivalent will change to INACTIVE immediately after the system is able to adequately heat and the diagnostic runs and passes. If heating can not be completed, use the «Diesel Exhaust Fluid Doser System Heater Test» found under «ECM Diagnostic Test» in the recommended Cummins® electronic service tool or equivalent to command heating to the tank heater and all line heaters.
• The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
• For On-Board Diagnostics (OBD) engines, the ECM will extinguish the Malfunction Indicator Lamp (MIL) after three consecutive trips where the diagnostic runs and passes.
• The “Reset All Faults” command in the recommended Cummins® electronic service tool or equivalent can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop Talk

This fault code can also set if heating of the aftertreatment DEF lines can not be achieved. Troubleshoot all line heater fault codes prior to Fault Code 3651.

Possible causes of this fault code include:

Blocked or restricted coolant flow to the diesel exhaust fluid tank heater

Disconnected or broken tank heater coolant supply hose

Malfunctioning or stuck closed diesel exhaust fluid tank heater control valve

Malfunctioning or stuck aftertreatment diesel exhaust fluid tank temperature sensor

Operation in extremely cold ambient conditions.

Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.

For intermittent power supply and datalink communication issues with Aftertreatment Components, it is highly recommended that the OEM Power Distribution Center fuses and relays be thoroughly checked for loose, missing or intermittent connections.