Suzuki F6A Service Manual page 96

MPI (Multi–Point Injection) type EFI (Electronic Fuel Injection) is used in engine control, achieving optimal air–fuel ratio
control. Additionally, by combining (integrating) the AT controller with the ECM (Engine Control Module), space saving
is achieved and maintenance qualities are improved. The main characteristics are as follows.
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A speed density system which determines the fuel injection amount according to the engine rpm and intake manifold
pressure is used.
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A sequential (separate injection by cylinder) system is used for the fuel injection system.
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A full–transistor type direct ignition system is used for ignition control.
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By means of the self–diagnosis function, when abnormality is detected in the ECM input signal, minimal driving
performance is secured by means of the failsafe function in the unlikely event of a malfunction.
The following diagram shows the input/output and control items for the EFI (&AT)(&A/C) controller.
Input device (or signal)
Ignition switch status signal
Crank angle sensor
Throttle sensor
Pressure sensor
Water temperature sensor
Ignition timing adjustment register
O sensor
2
Vehicle speed sensor
Electrical load signal (small lamp)
Test switch (in diagnostic monitor coupler)
(AT models)
AT shift switch (P, R, N, D, 2, L)
Diagnostic (in diagnostic monitor coupler)
Note: Internal circuit diagrams of the controller, etc., described in this section are shown as a conceptual draw-
ing in order to explain operation and may differ in part from actual configuration.
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SUMMARY
Control
EFI (&AT) Controller
Fuel injection control
Ignition timing control
ISC control
Fuel control
Radiator fan control
AT control
Self shutoff function
Battery reverse connection
protecting function
Failsafe function
Self–diagnosis
Output device
Injectors
IG coil/igniter
ISC valve
Fuel pump relay
Radiator fan relay
Shift solenoid valve
Main relay
Check engine lamp