Kubota WG1605-E3, Руководство по диагностике

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ECM SYSTEM
WG1605-G-E3,WG1605-L-E3,WG1605-GL-E3, DM
1-86
(4) Repair of Wiring Harness
INTRODUCTION
The EControls ECM for both certified and
non-certified fuel system relies on precise voltage input
and outputs to maintain precise fuel control during
normal operation. The ECM utilizes reference voltage
signals to calculate fuel control, command throttle and
engine speed and provide data to the operator through
the instrument cluster.
When diagnosing faults in the system often the
technician is required to disconnect the electrical
connectors in the wire harness. Technicians should
always use care when working on the wire harness.
Special care should be given to the following items:
• When disconnecting connectors always grasp the
connector at its base DO NOT PULL ON THE
WIRES this make cause extreme stress on the
crimped or solder joints
• Always depress or unlatch the connector DO NOT
USE A SCREW DRIVER TO PRY THE
CONNECTOR APART
as damage to the connector
or mating electrical device can occur
• When disconnecting a electrical connector always
check the connector for corrosion in the connector
pins, moisture in the connector, missing or damage
water seals.
• DO NOT PUSH THE ELECTRICAL PROBES INTO
THE PINS WHEN TESTING CIRCUITS
as this will
cause the pin to become enlarged and result in
intermittent electrical problems
• When reconnecting an electrical connector "PUSH"
the connector together until you here the "CLICK"
then "PULL" on the connector base to make sure it is
seated and locked.
• Make sure to route the harness in the original fashion
and secure the harness using straps, wire ties or
clips to prevent the harness from contact with hot
surfaces, rotating devices or damage for external
elements
Because the critical sensor control circuits operate at
low voltage it is always best to use solder to make joints
and replace connector pins. Refer to next page "REPAIR
OF WIRING HARNESS". If a connector is the "Molded"
type and requires repair the complete connector must be
replaced using a "pig tail" replacement.
CONNECTORS AND TERMINALS
As stated earlier always use care when probing a
connector or replacing terminals in a connector housing.
Improper repair of a connector can resulting in shorts at
the connector and can damage critical electrical
components. Always use a jumper wire between the
terminal when checking circuits.
NEVER USE A SHARP
POINTED OBJECT TO PROBE THROUGH THE
WEATHER TIGHT SEALS,
doing so will allow water to
intrude into the circuit and will result in future electrical
faults in the system or may deter system performance.
Using the proper tools when working on the wire
harness is essential to making proper and durable
repairs. Use of an improper tool may result in damaging
other electrical components and will result in needless
repair costs. When working with the use proper wire
stripping and cutting tools, use a fuse removal tool when
replacing or check fuses, use a small screw driver to
unlock connector latches, use electrical probes when
testing wires, it is often best to find mating connectors to
the EControls wire harness connectors for testing
circuits as this will ensure a positive connection when
reading ohms or voltage. Use the proper "Pin Removal
Tool" when removing a connector terminal from its
housing.
When diagnosing intermittent shorts in the electrical
system is often easy to find the fault by wiggling the wires
in a connector while the engine is operating as this may
cause the misalignment, or corrosion to negatively affect
the connection. Corrosion is a primary cause of electrical
faults within the system, always look for visible signs of
corrosion when diagnosing an electrical fault.
KiSC issued 12, 2016 A