Group 12 Engine Control System - Hyundai R480LC-9S Service Manual

GROUP 12 ENGINE CONTROL SYSTEM

GROUP 12 ENGINE CONTROL SYSTEM
1. MCU (Machine Control Unit) 1. MCU
2. MCU ASSEMBLY 2. MCU ASSEMBLY
1) To match the pump absorption torque with the engine torque, MCU varies EPPR valve output
pressure, which control pump discharge amount whenever feedbacked engine speed drops under
the reference rpm of each mode set.
2) Three LED lamps on the MCU display as below.
LED lamp
G is turned ON
G and R are turned ON
G and Y are turned ON
Three LED are turned
OFF
G : green, R : red,
H Y
U N
M O D A
I
D E
L :
R 3
2 0
-9
FUEL TANK
TOOL BOX
LED
H Y
U N
D A
M O
D E I
L :
R 2
1 0
-9
C N
- 5 1
2
C N
- 5 2
Trouble
Normal
Trouble on MCU
Trouble on serial
communication line
Trouble on MCU power
Y : yellow
Fuel tank
1
ECM(Engine control module)
C N
- 5 3
·
· Change the MCU
· Check if serial communication
lines between controller and cluster are
disconnected
·
Check if the input power wire (24 V, GND) of
controller is disconnected
·
Check the fuse
5-36
38095MS02
Service
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