TOHATSU MFS 25d Service Manual

4
4
Fuel System (Fuel Injection)
1. Special Tools ……………………………… 4-2
2. Piping Arrangement Diagram ……… 4-3
Fuel Hose, Vent Hose, Breather Hose,
Cooling Water Hose ………………………… 4-3
3. Parts Layout ……………………………… 4-4
Intake Manifold ……………………………… 4-4
Fuel System ………………………………… 4-6
Magneto ……………………………………… 4-10
Electrical Parts ……………………………… 4-12
Fuel Tank ……………………………………… 4-16
4. ECU System ……………………………… 4-18
(1) Configuration of ECU System …… 4-18
1) Sensors …………………………………… 4-19
2) Actuators ………………………………… 4-20
3) Control System (ECU) …………………… 4-21
(2) Control System ……………………… 4-21
(3) Fuel Injection Control ……………… 4-22
1) Fuel Injection Timing …………………… 4-22
2) Start Up Fuel Mapping ………………… 4-23
3) Acceleration Fuel Mapping ……………… 4-23
4) Deceleration Fuel Mapping …………… 4-23
5) Correction Based On Intake
Air Temperature ………………………… 4-23
6) Engine Temperature Correction ………… 4-23
(4) Control of Fuel Feed Pump (FFP) … 4-23
(5) Control of Tachometer …………… 4-23
(6) Warning Buzzer and Lamp (LED),
and Control of Engine Revolution
Speed …………………………………… 4-24
1) Location of Warning Buzzer and
Lamp (LED) ……………………………… 4-24
2) Waring Notification, Abnormality and
Action to be taken ……………………… 4-24
5. Ignition System ………………………… 4-25
(1) Configuration of Ignition System … 4-25
(2) Ignition Control ……………………… 4-26
1) Ignition Timing Control ………………… 4-26
2) Ignition and Combustion Order ………… 4-26
3) Ignition Timing …………………………… 4-26
4) Operations ………………………………… 4-26
(3) Fuel Feed System …………………… 4-27
6. Components of Fuel Feed System … 4-28
1) Fuel Pump
[Low Pressure Mechanical Pump] ……… 4-28
2) Vapor Separator ………………………… 4-28
3) Fuel Regulator …………………………… 4-29
4) Fuel Cooler ……………………………… 4-29
7. Outline of Fuel Injection System … 4-30
1) Air Intake System ………………………… 4-30
8. Inspection Items ………………………… 4-31
1) Inspection of Fuel Supply System ……… 4-31
2) Inspection of Filter ……………………… 4-31
3) Inspection of Fuel Pump ………………… 4-33
4) Inspection of Fuel Connector …………… 4-33
5) Measurement of Fuel Pressure ………… 4-34
6) Draining Fuel …………………………… 4-35
7) Disassembly of Vapor Separator ……… 4-36
8) Inspection of Vapor Separator ………… 4-37
9) Reassembly of Vapor Separator ……… 4-37
10) Inspection of ISC (Idle Speed Control) … 4-38
11) Inspection of Idle Speed ………………… 4-38

TOHATSU MFS 25d Specifications

General

Brand	TOHATSU
Model	MFS 25d
Category	Outboard Motor
Language	English