Service Manual

Aftertreatment Diesel Exhaust Fluid Dosing Unit Air Sid [...] ISB, ISBe and QSB (Common Rail [...]
Page 11-48 Section 11 - Exhaust System - Group 11
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Initial Check
Locate the DEF dosing unit on the vehicle.
The DEF dosing unit dataplate is located either on the top
or the side of the unit, as shown in the illustration (1).
Check the pipework going to and returning from the DEF
dosing unit for any signs of a leak.
DEF leaks will leave a white deposit around the fittings.
Remove the aftertreatment nozzle and make sure that it is
completely clear of blockage. Refer to Procedure 011-040
in Section 11.
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.
Perform the DEF flushing procedure regardless of the
initial air flow measurement.
Preparatory Steps
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.
WARNING
Acid is extremely dangerous and can damage the
machinery and can also cause serious burns. Always
provide a tank of strong soda water as a neutralizing
agent when servicing the batteries. Wear goggles and
protective clothing to reduce the possibility of serious
personal injury.
WARNING
Wear appropriate eye and face protection when using
compressed air. Flying debris and dirt can cause
personal injury.
• Disconnect the batteries. Refer to the OEM service
manual.
• Release the pressure in all vehicle air tanks. Refer to
the OEM service manual.