AE300-Wizard
Document No.:
E4.08.09
E4.08.09
:
AE_xx_000
Revision:
13
9
:
00
Page:
68 of 89
Copyright © 2019, Austro Engine GmbH
Dept.:
Electric/Electronic
Type:
User Guide
9
IQA Codes
To be able to work with IQA codes a USB/CAN-adapter with a “Qualified Maintenance” li-
cense has to be connected (see chapter “3.2.2 USB/CAN Adapter” on page 15) BEFORE
starting the AE300-Wizard. This will unlock the «IQA» tab:
9.1.1
Overview
Ideally all injectors produced should always inject the same quantity of fuel when a certain
energizing time and a given rail pressure is applied. But during the manufacturing process
mechanical and electrical tolerances of the injectors produced are unavoidable.
In reality, when testing a sample of injectors coming off the manufacturing line different in-
jectors will show different injection quantities while applying the same rail pressure and en-
ergizing timing during each test. Usually these variations are high at low rail pressures and
short energizing times and less pronounced at high rail pressures.
In the case of the AE300 engine using 4 injectors the variation for low injection quantities
would cause rough idling while the variations for high injection quantities would impact the
maximum power developed by 2% – 3%.
As the AE300 engine uses more than one injection per compression stroke (= per injection
event at TDC) the ECU has to be able to control the injection quantity to very tight toleranc-
es. This will result in a smooth idle and prevent torque pulses especially at higher power set-
tings.
The manufacturer of the injectors tests and marks each injector with a set of adjustment
values, the “Injector Quantity Adjustment” code. This IQA code consists of 6 alphanumeric
positions and is printed on the injector housing. It tells the ECU how to adjust its injection
map so a specific injector will produce the injection quantity and timing intended by the ECU.
For smooth running and predictable engine power the AE300 EECU has to know the injection
behavior of each individual injector (indicated by its IQA code) for each cylinder position.
The AE300-Wizard’s IQA functions described below support the maintenance organizations in
their documentation, installation, trouble shooting and repair tasks.
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