3
1. INTRODUCTION
1.1 WHAT IS SEQUENT 24?
SEQUENT 24 is the BRC sequen-
tial injection system in the gaseous
phase that is easy to install, quick
to map and low-cost. Its installation
gets simpler owing to the new phi-
losophy adopted for sensors and
emulators. The SEQUENT 24
actually does not contemplate any
additional devices; the emulators
are integrated in the ECU and the
sensors are integrated in the main
components (Genius and RAIL).
The connections are quicker owing
to the specific connectors; moreo-
ver, it is not necessary anymore to
connect the TPS signal whereas
the choice to connect the lambda
oxygen sensor signal is still optio-
nal. For the RPM signal it will be
possible to choose a coil signal too,
in addition to a standard RPM
signal or crankshaft position sensor
signal. The new SEQUENT 24 PC
programme is easier to use and
completely separated from the
standard SEQUENT and from the
SEQUENT FAST, also as regards
the filing of the mappings, but it
anyway keeps their basic philo-
sophy unchanged.
1.2 MAIN DIFFERENCES
WITH THE PREVIOUS
SEQUENT SYSTEMS
In the following table you will find
the list of the main differences
between standard SEQUENT /
SEQUENT FAST and SEQUENT
24:
Sensors
• P1-MAP (case)
• Tgas on the reducer
• P1-Tgas integrated on rail
• Twater integrated on the reducer
• MANIFOLD PRESSURE ONLY WHILE
SELF-MAPPING
Injectors Cut
• Cut on the negative inside the ECU
• Emulation with the Modular LD
•
Cut on the POSITIVE inside the ECU
and simultaneous for the 4 injectors (the
orange wires do not enter the ECU)
Key contact and Petrol Injectors
Positive
•
To connect to the key contact positive
(brown) and to the petrol injectors positive
(white-green)
•
The key contact positive becomes
petrol injectors positive that goes into and
out from the ECU. ECU ignition only if the
petrol injectors positive is active
Communication
•
Active with key contact positive ON
•
Active with the engine switched on;
once it is connected it remains active
even disconnecting the key contact (if the
PC/ communication is not disconnected)
Changeover switch
• 10 pins connected with the ECU
• 3 pins connected with the ECU + one
for the level on the changeover switch
Screen
•
Connected with the ECU case with a
specific pin
•
Connected with the battery ground
TPS connection
•
Necessary or Optional
•
Not connected
RPM Connection
•
Necessary or Optional
•
It is possible to use the RPM counter
signal, the crankshaft position sensor
signal (only one wire) or the coils negative)
Filing of the mappings
•
FSF+AAP file or only FSF for vehicle
parameters and mapping
•
FLS file for vehicle parameters and
mapping..
•
Separated from the previous Sequent
systems
Advance variator
•
Inside
•
Outside
SEQUENT / SEQUENT FAST
SEQUENT 24
