Cummins ISX11.9 CM2250 – Service Manual 011-075   Air in the Diesel Exhaust Fluid

CAUTION  Care should be taken when handling and/or disconnecting the diesel exhaust fluid line from the aftertreatment diesel exhaust fluid dosing valve. The intake of the aftertreatment diesel exhaust fluid dosing valve is plastic and can be easily damaged.

Remove the aftertreatment diesel exhaust fluid dosing valve supply line from the aftertreatment diesel exhaust fluid dosing valve.

Install the diesel exhaust fluid extension line, Part Number 4919574.

Obtain a container suitable for collection of the diesel exhaust fluid that exits the aftertreatment diesel exhaust fluid dosing valve supply line. A 3.8 liter [1 gal] bucket is recommended.

Route the outlet of the diesel exhaust fluid extension line into the collection container.

Turn the keyswitch to the ON position and connect INSITE™ electronic service tool.

Select the Diesel Exhaust Fluid Doser Pump Override test under the ECM Diagnostic Tests menu.

This test will attempt to prime the dosing system. During this test, diesel exhaust fluid will be drawn from the tank and pumped through the diesel exhaust fluid extension line.

NOTE: Once the test is initiated it will continue to pump diesel exhaust fluid, even when attempting to stop the test with INSITE™ electronic service tool. To stop the test, it is necessary to turn the keyswitch to the OFF position.

Observe the diesel exhaust fluid flow exiting the diesel exhaust fluid extension line while the Override Test is running.

Bubbles are an indication of a leak that allows air to enter the dosing system.  If bubbles are present, check the following components for damage or leaks:

• Aftertreatment diesel exhaust fluid dosing unit fittings
• Aftertreatment diesel exhaust fluid dosing unit supply line
• Aftertreatment diesel exhaust fluid tank assembly
• Aftertreatment diesel exhaust fluid tank fittings.

Repair or replace any damaged components.

Turn the keyswitch to the OFF position to end the test.

NOTE: If this test is run for an extended period of time, Fault Code 1682 will become active. Limit the test time to 5 minutes or less.

• Remove the aftertreatment diesel exhaust fluid extension line.
• Connect that aftertreatment diesel exhaust fluid dosing valve supply line.
• Discard the collected diesel exhaust fluid. Dispose of the collected diesel exhaust fluid in accordance with local environmental regulations.
• Operate the engine and check for leaks.