Doosan D439E - Page 165

D439E Service Manual 4. Fuel system
163
Trouble diagnosis flow for engine stall
Repair or replace
harness
Defective relay
En
g
ine sto
p
ECU
Communication
error
Check main relay
OK
Replace the relay
Defective fuse
Check ECU fuse
OK
Replace fuse
Key switch : 5A
M
a
in
po
w
e
r : 1
0
A
Check
ECU connector for
connection
OK
Connect connector
Not applied state
Check ECU
ground (Battery “-“ terminal
with ECU ground and Chassis
ECU ground)
OK
Check wire
harness and repair
or replae
Check if +B terminal
of ECU and both ends of key
switch are 24 V.
OK
Check
communication line
harness connector
Re
p
lace ECU
NG
OK
NG