Electronic Control System - Yanmar 4JH45 Operation Manual

12/05
ELECTRONIC CONTROL
SYSTEM
WARNING
• The 4JH common rail series engines
use a high pressure common rail
system.
• The fuel is injected at extremely high
pressure.
• Never disassemble the fuel system
parts.
• Failure to comply may result in death
or serious injury.
• If a malfunction occurs, consult your
nearest Yanmar dealer or distributor.
• Never use the ECU for other purposes
than intended or in other ways than
specified by Yanmar. Doing so could
result in the violation of emission
control regulations and will void the
product warranty.
• Be sure to use the ECU in conjunction
with the engines whose models or
serial numbers are specified by
Yanmar.Other ECU/engine
combinations than specified will void
the engine warranty.
• Replacing the fuel injector involves
rewriting the fuel injection data in the
ECU. Be sure to consult your local
Yanmar dealer before replacing the fuel
injector. Failure to rewrite the fuel
injection data before replacing the fuel
injector will void the engine warranty.
• Improper use or misuse of the ECU
may result in death or serious injury
due to an abrupt and unexpected
increase in engine speed.
JH Series Operation Manual
PRODUCT OVERVIEW
• Replacing the ECU involves migrating
the fuel injection data to the existing
ECU to the new unit. Be sure to consult
your local Yanmar dealer before
replacing the ECU. Failure to migrate
the fuel injection data before replacing
the ECU will void the engine warranty.
• Do not plug or unplug the ECU for a
period of at least 6 seconds after power
to the unit has been turned on or off.
• Do not touch connector pins of the ECU with
bare hands.
Doing so may result in corrosion of the
connector pins and/or damage to the internal
circuits of the ECU due to static electricity.
• Do not force a measuring probe into the
female coupler.
Doing so may cause contact failure of
the connector pins, resulting in
malfunction of the ECU.
• Take care to prevent water from entering
the couplers when plugging or
unplugging the connector.
Water inside the couplers may cause
corrosion, resulting in malfunction of the
ECU.
• Avoid plugging/unplugging the connector
more than approx. 10 times.
Frequent plugging/unplugging of the
connector may cause contact failure of
the connector pins, resulting in
malfunction of the ECU.
• Do not use the ECU that has ever
suffered drop impact.
• Always check the battery for proper charge.
Otherwise the electronically controlled
engines may fail to start.
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