Suzuki DF 50 Service Manual

ENGINE CONTROL SYSTEM STRUCTURE ____________________ 3-1
SYSTEM STRUCTURE 1 ................................................................................ 3-1
SYSTEM STRUCTURE 2 ................................................................................ 3-2
WIRING DIAGRAM FOR ENGINE CONTROL ............................................... 3-3
COMPONENTS FOR SYSTEM CONTROL ______________________ 3-4
ENGINE CONTROL MODULE (ECM) ............................................................ 3-4
ECM CONNECTORS / TERMINALS LAYOUT ............................................... 3-5
ECM INTERNAL STRUCTURE....................................................................... 3-6
SENSOR AND SWITCH .................................................................................. 3-7
IGNITION SYSTEM ________________________________________ 3-11
IGNITION CONTROL SYSTEM ...................................................................... 3-11
ELECTRONIC FUEL INJECTION SYSTEM _____________________ 3-13
FUEL INJECTION CONTROL SYSTEM......................................................... 3-13
FUEL DELIVERY SYSTEM COMPONENTS .................................................. 3-15
FUEL PUMP CONTROL SYSTEM.................................................................. 3-18
AIR INTAKE COMPONENTS .......................................................................... 3-19
IDLE AIR CONTROL SYSTEM OUTLINE ...................................................... 3-20
CAUTION SYSTEM ________________________________________ 3-22
OVER-REVOLUTION CAUTION SYSTEM ..................................................... 3-22
LOW OIL PRESSURE CAUTION SYSTEM.................................................... 3-23
OVERHEAT CAUTION..................................................................................... 3-24
LOW BATTERY VOLTAGE CAUTION SYSTEM ............................................. 3-25
SELF-DIAGNOSTIC SYSTEM ________________________________ 3-26
PRIORITY / CODE / PATTERN FOR SELF-DIAGNOSTIC
SYSTEM OPERATION .................................................................................... 3-26
CONDITION FOR SELF-DIAGNOSTIC SYSTEM OPERATION.................... 3-28
FAIL-SAFE SYSTEM _______________________________________ 3-29
PRE-PROGRAMMED VALUE FOR FAIL-SAFE SYSTEM ............................ 3-29
OPERATING HOUR INDICATION SYSTEM _____________________ 3-30
START-IN-GEAR PROTECTION SYSTEM ______________________ 3-31
O
2
FEEDBACK SYSTEM_____________________________________ 3-32
INSPECTION _____________________________________________ 3-33
PRECAUTION ON SYSTEM INSPECTION .................................................... 3-33
INSPECTION FOR ECM CIRCUIT VOLTAGE ................................................ 3-33
INSPECTION FOR RESISTANCE .................................................................. 3-35
OTHER INSPECTION ...................................................................................... 3-36
TROUBLESHOOTING ______________________________________ 3-41
REMOVAL / INSTALLATION _________________________________ 3-47
FLYWHEEL / CKP SENSOR / CMP SENSOR ............................................... 3-47
OIL PRESSURE SWITCH ............................................................................... 3-50
3
ENGINE CONTROL SYSTEM
CONTENTS

Suzuki DF 50 Specifications

General

Engine Type	4-Stroke
Cylinders	3
Displacement	941 cc
Starting System	Electric
Steering	Remote
Engine Type Detail	DOHC 12-Valve
Maximum Output	50 HP
Ignition System	Digital CDI
Alternator	12V 19A
Gear Ratio	2.27:1
Exhaust	Through Prop Hub Exhaust
Trim Method	Power Trim and Tilt
Max Power	50 HP
Alternator Output	12V 19A
Fuel Delivery System	Sequential Multi Point Electronic Fuel Injection
Full Throttle Operating Range	5, 300 - 6, 300 rpm
Engine Oil Capacity	2.7 L
Full Throttle RPM Range	5300 - 6300 RPM
Oil Capacity	2.7 L
Bore x Stroke	72.5 x 76.0 mm (2.85 x 2.99 in.)