Service Manual

Aftertreatment Diesel Exhaust Fluid Dosing Unit Air Sid [...] ISB, ISBe and QSB (Common Rail [...]
Page 11-50 Section 11 - Exhaust System - Group 11
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• Connect one end of the coiled PTFE pipe to the dosing
pump air supply port (1), and the opposite end to the
regulated vehicle air supply (2), using the barrel
connector from service tool kit, Part Number 5296510.
• Remove the air flow meter from the aftertreatment
nozzle DEF supply line and direct the line into a
suitable container away from electrical components.
• Start and operate the engine. The DEF dosing unit will
go through its priming cycle After a maximum of 140
seconds, the water will attempt to force through the
aftertreatment nozzle DEF supply line.
• Collect the fluid in a container.
• If INSITE™ electronic service tool is available, the
DEF Doser Pump Air Solenoid Click Test can be used
during the flush to toggle the solenoid valve. This will
improve the effectiveness of the procedure.
• If all the water has been forced out of the air solenoid
exhaust port, the flush procedure should be repeated
(no more than three attempts should be necessary).
• Once all the water is delivered from the injector line,
wait for 30 seconds for clear air flow.
NOTE: Make sure the vehicle air supply to the DEF
dosing unit is either drained down or isolated before
removing the air supply line.
• Remove the coiled PTFE pipe and barrel connector
from the DEF dosing unit air supply line.
• Connect the OEM air supply line to the dosing unit.
Test
WARNING
Diesel exhaust fluid (DEF) contains urea. Do not get the substance in your eyes. In case of contact,
immediately flush eyes with large amounts of water for a minimum of 15 minutes. Do not swallow. In the event
the DEF is ingested, contact a physician immediately. Reference the materials safety data sheet (MSDS) for
additional information.
WARNING
Wear appropriate eye and face protection when using compressed air. Flying debris and dirt can cause
personal injury.
Connect the air flow meter from service tool kit, Part Number 5296510, to the aftertreatment nozzle DEF supply line.
Start and operate the engine. The DEF dosing unit will go through its priming cycle. After a maximum of 140 seconds,
air should pass through the dosing line and through the air flow meter.
Specification: Air flow greater than 25 liters [6.6 gal] per minute.
If the air flow is less than the specification or if air leaks from the air regulating unit, the dosing unit will require
replacement. Refer to the OEM service manual or contact a Cummins® Authorized Repair Location.
Remove the air flow meter from the aftertreatment nozzle DEF supply line and connect the DEF supply to the
aftertreatment nozzle. Refer to Procedure 011-040 in Section 11.