TOHATSU MFS 25D Service Manual page 103

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
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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
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