Hitachi ZW180, Technical Manual

Page: 168 / 374

SYSTEM / Electrical System
T2-4-18
ENGINE STOP CIRCUIT
•
When the key switch is turned from the ON
position to the OFF position, the signal current
indicating that the key switch is ON stops flowing
from terminal M to terminal #39 of ECM.
•
ECM unexcited the fuel injection solenoid valve
and the engine is stopped.
•
The ECM relay is excited for 30 seconds after the
key switch is OFF by the timer function. Thus,
current flows to terminals #3 and #4 of ECM, and
ECM is kept ON.
•
After 30 seconds, the timer stops and ECM is
turned OFF.
T4GD-02-04-018
NOTE: The illustration shows the current flow
when the timer is working with the key
switch OFF.
Key Switch
Fuse Box A
Fusible
Link
Battery
Relay
Battery
Fuse
(120A)
Fuel Injection
Solenoid Valve
ECM
39
8
7
To Fuses #7, #9, #15 of
Fuse Box B
From Fuse #7 of
Fuse Box B
3
4
Diode
Diode
From Fuse #9 of
Fuse Box B
From Fuse #15 of
Fuse Box B
ECM Relay