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2.23.1. ISA3 mode
With ISA3 selected, the following set of parameters and settings is available.
Fig. 52 Configuration of ISA3 adaptation
Adaptation switch on threshold
– Accepted deviation between the actual petrol injection
time and time recorded for the reference petrol map. In other words, adaptation will be
attempted only if the deviation exceeds the threshold value. Due to the mentioned natural
distribution of petrol injection pulses as a result of the ECU control, a minimum deviation
setting is 4%.
LTFT maximum
–
maximum limit of the correction value that autoadaptation can
implement.
Adaptation in OL
– Activation/deactivation of autoadaptation in an open loop mode. The
function requires a voltage type Lambda sensor connected and activated Fuel Loop
Status reading option (see: OBDII/EOBD reader (Chapter 2.20).
Map autocomplete
– Activation/deactivation of the auto-switching to petrol option in
areas without reference injection pulses recorded. The option works within an RPM range
from 1500 to 6000.
Auto stop
–
checking the option will result in automatic blocking of engine operating
curve points on
MAP correction
map when the specified deviation limit is reached (see:
“Adaptation enable threshold”)
Active
– autoadaptation On/Off.
STFT bank 1
– current correction of injection time implemented by the autoadaptation.
Temp. dev. Bank 1
– Momentary percentage value of petrol injection time deviation when
driving on gas with respect to the reference injection recorded when driving on petrol. A
positive value means that the injection time on gas is longer than on the reference map.
ISA3 OL mode
– indication of autoadaptation working in an open loop mode.
I
n order to improve the quality of ISA3, the reference petrol map should be
acquired on a warmed engine. The required minimum engine temperature is
higher when ISA3 is On. Therefore, when the adaptation is activated, certain
points on the map may disappear (the controller remembers the temperature at
the time of data acquisition for individual points).
The actual engine temperature is estimated based on the controller’s integrated
algorithm or read directly from the OBD, if reading is active (see: Parameter and
fault reader OBDII/EOBD).
If the vehicle is equipped with a diagnostic system compatible with OBDII / EOBD
is recommended to connect and configure the OBD reader to retrieve information
about the status of the control system fuel dose. This makes it possible to
pinpoint the areas of engine operation in open loop mode and precise adaptation.