5-2
5-53
GROUP 14 ENGINE CONTROL SYSTEM
2. MCU ASSEMBLY
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.
Three LED lamps on the MCU display as below.
1)
2)
ECM (Engine control module)
LED
CN-51
CN-52
1
2
1
MCU
2
Bolt (M8)
140L5MS52
G : green, R : red, Y : yellow
LED lamp
Trouble
Service
G is turned ON
Normal
-
G and R are turned ON
Trouble on MCU
㔽
Change the MCU
G and Y are turned ON
Trouble on serial
communication line
㔽
Check if serial communication
lines between MCU and cluster are disconnected
Three LED are turned OFF Trouble on MCU power
㔽
㔽
Check if the input power wire (24 V, GND) of MCU
is disconnected
Check the fuse
1. MCU and ENGINE ECM
(SERIAL NO. : -#0610)
Summary of Contents for HX140L
Page 12: ...SECTION 1 GENERAL SECTION 1 GENERAL Group 1 Safety Hints 1 1 Group 2 Specifications 1 10...
Page 209: ...4 5 MEMORANDUM...
Page 694: ...8 68 125LCR8TM30 Turn casing 1 upside down and remove oil seal 3 using jig 29...
Page 734: ...8 108 Assemble plug 2 Plug NPT1 16 11 EA 17 21078TM68 21078TM69 21078TM70 21078TM71...
Page 756: ...8 130 Remove lock nut 22 and then boot 23 14 36078RL14 2507ARL10...