Yanmar 4BY, Service Manual

Page: 238 / 275

ELECTRICAL AND ECU
BY Service Manual 12-11
Function Description - Engine Management System
Electrical Panel Connector (X1)
Connections
The ECU is connected to other components and
systems via connector X1
(Figure 12-4) . The
graphic and table show the pin locations and
assignments.
Figure 12-4
Connector X1 Pin Assignments
W X
K
V
J
B
L
U
H
T
G
A
C
M
N
D
E
F
S
R Q P
O
0003304
Connector Pin Name Assignment Detail
Max
Current
X1 A KL31 Battery Ground Terminal Common ground 20 A
X1 B KL30 Battery Positive Terminal
Common power supply for engine
controller, injection system, and fuel pump
10 A
X1 C KL50 Start Signal from Key Switch Input signal to engine controller 1 A
X1 D KL15 Ignition Power Input Input signal to controller 1 A
X1 E K-Line Diagnostic Serial I / O 0.1 A
X1 F Error Indicator Check Engine Indicator Input signal for CAN hub 0.5 A
X1 G
Instrument
Power
Fused Battery Power Power for accessories 5 A
X1 H
Warning
Indicator
0.5 A
X1 J GEAR Switch to Ground Start-in-gear protection 50 mA
X1 K FWG2 Throttle Position Second Channel Analog throttle safety channel 5 mA
X1 L FWG1 +5V Throttle Supply f. Main Channel 5 mA
X1 M FWG1 GND Throttle Return f. Main Channel 5 mA
X1 N FWG1 Throttle Position Main Channel Analog throttle main channel 5 mA
X1 O FWG2 +5V Throttle Supply f. Second Channel 5 mA
X1 P FWG2 GND Throttle Return f. Second Channel 5 mA
X1 Q Not used
X1 R CAN+ CAN Power Supply Delayed power-off; diode 3 A
X1 S CAN_H CAN High EDC data line 50 mA
X1 T CAN_L CAN Low Not terminated 50 mA
X1 U CAN- Shield
X1 V
Oil Pressure
Gauge
Resistive Oil Sensor to Ground Input signal for CAN hub 0.5 A
X1 W
Water-in-Fuel
Sensor
Ground Signal if Water is in Fuel Input signal for CAN hub 0.1 A
X1 X Not used