General Description; Electronic Fuel Injection System Description - Suzuki GF60A Service Manual

1G-2 Fuel System:

Electronic Fuel Injection System Description

The fuel injection system used by the DF60A is a speed-density, multi-point, sequential, electronic fuel injection type.
The fuel injection system is composed of the fuel line components, air intake components, and components for system
control (ECM, sensors, switches, etc.).
Fuel Injection Control System Outline
Sensors are mounted at precise locations on the motor to monitor the current conditions of engine operation and send
signals to the ECM.
Based on these signals, the ECM determines the optimum fuel injection time duration (fuel amount), fuel injection
timing (multi-point sequential timing) and controls the injector operating signals accordingly.
In regards to fuel injection timing, the fuel injection end timing is set depending on engine rpm. The ECM calculates
the amount of fuel injection based on the engines operating conditions, and determines the fuel injection start timing.
In the injection timing chart below, the injection end timing is set at 60° BTCD on the exhaust stroke.
Basic sensors
MAP sensor:
Informs ECM of intake manifold pressure.
CKP sensor:
Informs ECM of engine speed and crankshaft angle.
Compensating sensors
Cylinder temperature sensor:
Informs ECM of cylinder temperature.
IAT sensor:
Informs ECM of intake air temperature.
TPS (Throttle position sensor):
Informs ECM of throttle opening angle.
Battery voltage:
Constantly monitored by the ECM.
Others
CMP sensor:
Informs ECM of camshaft angle.
Neutral switch:
Informs ECM of shift position (neutral or in-gear).
1
1. Battery charge coil
2. Rectifier / regulator

General Description

7
4
2
3
6
5
3. 30 A fuse
4. 30 A fuse
9
CPU
A A A
8
5. Battery 7. ECM main relay
6. Ignition switch 8. Injector
ECM
Fuel injection time duration
(amount) is determined by
a digital map designed in
relation to intake manifold
pressure and engine
speed.
Fuel amount compensation
Multi-point sequential timing
Signal Signal Signal
Injector
"A"
9. ECM
"A": Sensor/switch signal input
ZAJ6111701001
IAJ611170001-01
IAJ611170002-02