Hino S5-LJ05E04A Workshop Manual page 18

1–14
(5) Installation of battery disconnect switch
! WARNING
• Installation of the battery disconnect switch on the power supply circuit for the dosing control unit of DEF-
SCR (DCU) may damage or result in the malfunction of DEF-SCR system.
• Be sure to read and follow the procedures and instructions on the service bulletin before the installation of
the battery disconnect switch.
(6) Handling of battery disconnect switch
! WARNING
• Wait for at least ten minute before using the battery disconnect switch after the starter key is turned to
"LOCK" position.
Otherwise, the vehicle data will not be recorded on ECU properly, which may result in the malfunction of DPR
system.
2. PRECAUTION FOR ELECTRIC WELDING
Electrical components such as the alternator and tachograph are directly connected to the battery and one
end is earthed to the chassis frame. Under these conditions, welding current will flow back along the earth
circuit if electric welding is carried out and damage may be caused to the alternator, tachograph, electrical
components, etc. Consequently, the following precautions are always to be taken during welding.
(1) Disconnect the earth terminal of the battery at the frame fitment and earth the welding equipment securely to the
frame itself. (Do not fit the welding equipment earth to such things as the tire rims, brake pipes or fuel pipes and leaf
spring, etc.)
a. Turn the starter switch off.
b. Disconnect the battery's negative terminal of the battery.
c. Earth welding equipment securely, near to the area to be welded.
d. Put back battery negative ground as original condition.
e. Finally check the functioning of all instruments.
ALTERNATOR
ETC.
ARC WELDING
MACHINE
(2) In order to prevent damage to ancillary equipment components from sparks during welding, take steps such as put-
ting fire-resistant covers over things like the engine, meters, steering wheel, hoses, leaf spring and tires.
GENERAL INTRODUCTION
COMPUTER
BATTERY
CHASSIS FRAME
Connect the ground of the ARC welding
machine near the place on the frame to be
welded but not connect it to plated parts such
as fuel pipes, brake pipes and leaf spring.
Disconnect the ground terminal for
battery at the connecting point on the
frame and disconnect the ground for
computer as well.
CHASSIS FRAME
SHTS01ZZZ0000020