GENERAL INTRODUCTION
1–12
SAFETY INSTRUCTIONS FOR WORK
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PRECAUTIONS
1.
SAFETY INSTRUCTIONS FOR HANDLING ELECTRICAL SYSTEMS
(1)
Remove the battery cable
! WARNING
•
Be sure to wait for at least ten minutes after the starter key is turned to "LOCK" position before you discon-
nect the battery terminals from the battery, as the vehicle data is recorded on ECU and DCU starts working
for the exhaust gas after treatment after the starter key is turned to "LOCK" position. Otherwise, the vehicle
data will not be recorded on ECU properly and DCU will not complete working properly, which may result in
the malfunction of DPR system and DEF-SCR system.
•
The MIL (malfunction indicator light) may come on when the starter key is turned to "ON" position again,
even if you wait for at least ten minutes before disconnecting the battery terminals from the battery after the
starter key is turned to "LOCK" position. In this case, use HINO-DX to clear the DTC (P204F and P068A), to
turn off the MIL and to conduct DPR regeneration manually.
a.
Before electrical system work, remove the cable from the minus terminal of the battery in order to avoid burning
caused by short-circuiting.
b.
To remove the battery cable, fully release the nut to avoid damage to the battery terminal. Never twist the termi-
nal.
(2)
Handling of electronic parts
a.
Never give an impact to electronic parts of a computer or relay.
b.
Keep electronic parts away from high temperatures and humidity.
c.
Never splash water onto electronic parts in washing the vehicle.
d.
Do not remove the harness connector, electric component box, and cover except for repair and inspection.
If removal is necessary, pay attention that water and foreign matters do not attach or enter to the connector, ter-
minals, electric component box, and cover.
In restoration, make sure there is no attachment or entry of water and foreign matters and mount them properly,
because it causes degradation of waterproof function.
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LOOSEN
INCORRECT
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