Service Manual

ISB, ISBe and QSB (Common Rail [...] Aftertreatment Diesel Exhaust Fluid Dosing Unit Air Sid [...]
Section 11 - Exhaust System - Group 11 Page 11-49
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Flush
CAUTION
Fluid can attempt to force through the solenoid
exhaust port on the doser. Damage to the selective
catalytic reduction (SCR) dosing unit can occur.
The DEF dosing unit must be wiped with a clean damp
cloth and/or a wash bottle with mild detergent. This will
remove any contamination and reduce the risk of debris
entering the DEF dosing unit.
The dosing control unit connections are listed below:
1 Compressed air supply
2 Air solenoid connector (2-pin)
3 ITT Cannon™ on connector (37-pin)
4 DEF supply to aftertreatment nozzle (PTFE line)
5 DEF supply to pump
6 DEF return.
Lines 4, 5, and 6 have quick-fit connections. A quick
release fitting is also used for the air connection at the top
of the DEF dosing unit. To release the fitting, apply equal
pressure to both sides of the release collar, and pull the
pipe from the fitting.
NOTE: Make sure the vehicle air supply to the DEF
dosing unit is either drained down or isolated before
removing the air supply line.
• Disconnet the air supply line to the dosing unit.
• Coil the polytetrafluoroethylene (PTFE) pipe and
fasten using tape. Fill the piping with clean water.