GROUP 4 MECHATRONICS SYSTEM
1. ALL ACTUATORS SPEED ARE SLOW
Boom, Arm, Bucket, Swing and travel speed are slow, but engine speed is good.
※
Spec : P-mode 1850 ± 50 rpm
※
Before carrying out below procedure, check all the related connectors are properly inserted and
※
fault code on the cluster.
1)
INSPECTION PROCEDURE
NO
Check if HCESPN
140 active fault
display on the LCD
YES
Wiring diagram
MCU
CN-52
S -mode
YES
Check electric
current at EPPR
valve
SPEC : 100~700 mA
See TEST 2
NO
YES
Check resistance
at EPPR valve
SPEC : 15~25Ω(20˚C)
See TEST 1
NO
8
9
10
18
1750 ± 50 rpm
YES
Check pressure
at EPPR valve
NO
SPEC : 2~25 kgf/cm
2
See TEST 3
PUMP EPPR VALVE
9
10
CN-75
CN-1
6-40
E-mode 1650 ± 50 rpm
Cause
Remedy
Defective
hydraulic system
Defective
Replace
EPPR valve
Defective MCU
Replace
Short circuit or
Check & repair
poor connection
wire harness or
between CN-52
between CN-52
-CN-75
-CN-75
Defective EPPR
Replace
valve
FUSE
NO.12
1
2
140L6MS01