Cummins ISX11.9 CM2250 – Service Manual 011-057   Aftertreatment Diesel Exhaust Fluid Controller

The aftertreatment diesel exhaust fluid (DEF) controller is the central control for the SCR diesel exhaust fluid dosing system, and handles the dosing activity, tank level sensing, tank temperature sensing, line heading, and tank heating. The aftertreatment DEF controller is capable of operating on both 12 and 24 volts DC.

The location of the aftertreatment diesel exhaust fluid controller varies by application and OEM. The controller will typically be mounted to the vehicle frame or suitable rigid bracket. Refer to the OEM service manual for a more detailed component location description.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

• Disconnect the batteries. Refer to the OEM service manual.

The vehicle battery supply to the aftertreatment diesel exhaust fluid controller must be disconnected before removing the 53-pin connector.

Disconnect the 53-pin and 86-pin connectors from the aftertreatment diesel exhaust fluid controller by releasing the locking mechanism and pulling the connectors straight out.

The 86-pin connector must be removed before the 53-pin connector.

Remove the capscrews that secure the aftertreatment diesel exhaust fluid controller to its mounting location.

Remove the diesel exhaust fluid controller.

CAUTION  Do not blow compressed air into the aftertreatmentdiesel exhaust fluid controller ports or connectors. Compressed air can contain moisture due to condensation.

Use quick-dry electrical contact cleaner, Part Number 3824510, to remove all dirt and moisture from the aftertreatment diesel exhaust fluid controller ports and the harness connectors.

Inspect both connectors for broken, bent, corroded, or damaged pins. Repair or replace as necessary.

CAUTION  Do not paint the back side of the aftertreatment diesel exhaust fluid controller. Make sure no grease or dirt is between the aftertreatment diesel exhaust fluid controller and its mounting location.

Install the new aftertreatment diesel exhaust fluid controller to the mounting location.

Tighten the capscrews.

Connect both the 53-pin and 86-pin connectors to the aftertreatment diesel exhaust fluid controller. 

The 53-pin connector must be installed before the 86-pin connector.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

• Connect the batteries. Refer to the OEM service manual.
• Operate the engine and check for proper operation.