Service Manual

Aftertreatment Diesel Exhaust Fluid Line Restriction Te [...] ISB, ISBe and QSB (Common Rail [...]
Page 11-56 Section 11 - Exhaust System - Group 11
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Supply Line Restriction
1 Connect the male J2044 line from the vacuum test kit
to the DEF supply line to dosing unit connector.
2 Gradually operate the vacuum pump while observing
the clear pipe lines that leads to the collection cup. At
the moment when fluid reaches the collection cup and
is static in the line, record the pressure displayed by
the vacuum gauge.
3 If the vacuum gauge reads 20 kPa [3 psi] or less, the
restriction in the line is acceptable and fluid can be
drained back to the tank. However, if the pressure
exceeds 20 kPa [3 psi] at any time, a restriction or
blockage has been detected. Disconnect the vacuum
pump and look for the routing of the DEF line that
could result in restriction. If no routing issues are
found, replace the line.
4 Connect the DEF supply line to the DEF dosing unit.
NOTE: Consult the OEM service manual for information
regarding DEF line routing and repair/replacement
procedures.
Return Line Restriction
1 Connect the male J2044 line from the vacuum test kit
to the DEF return line to dosing unit connector.
2 Operate the vacuum pump continuously for 30
seconds while observing the clear pipe lines that lead
to the collection cup. The vacuum pump should not
draw DEF from the tank, although some DEF may still
remain in the lines.
3 The vacuum pump gauge should not read above 0
kPa [0 psi] during this test. If the vacuum gauge reads
above 0 kPa [0 psi] during this test, a line restriction or
blockage has been detected. Disconnect the vacuum
pump and look for the routing of the DEF line that
could result in restriction. If no routing issues are
found, replace the line.
4 Connect all DEF lines.
NOTE: Consult the OEM service manual for information
regarding DEF line routing and repair / replacement
procedures.
Finishing 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.
• Connect the batteries. Refer to OEM service manual.
• Operate the engine and check for leaks.