Service Manual

Aftertreatment Diesel Exhaust Fluid Dosing Unit ISB, ISBe and QSB (Common Rail [...]
Page 11-42 Section 11 - Exhaust System - Group 11
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Test
WARNING
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.
Start the vehicle and wait 140 seconds for the pump to
begin the prime cycle.
WARNING
Wear appropriate eye and face protection when using
compressed air. Flying debris and dirt can cause
personal injury.
NOTE: Some early calibrations do not have the 140
second delay, and the pump will begin the prime cycle
when the vehicle is started.
Thirty seconds after the prime cycle is completed, the
dosing unit will exhaust air down the aftertreatment
injection line.
NOTE: The DEF dosing unit could take up to 20 attempts
to prime. Each prime attempt will last 30 seconds.
WARNING
The exhaust and exhaust components can remain hot
after the engine has been shut down or secured. To
avoid the risk of fire, property damage, burns, or
other serious personal injury, allow the exhaust
system to cool before beginning this procedure or
repair and make sure that no combustible materials
are located where they might come in contact with hot
exhaust or exhaust components
NOTE: Make sure that the airflow meter flow adjustment
is set to allow maximum airflow, in order to prevent a false
reading.
Record the reading from the airflow meter.
The airflow should be a minimum of 25 liters per minute
[6.6 gallons per minute].