Kubota M108S, Workshop Manual

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9-S29
M108S, WSM ELECTRICAL SYSTEM
Injector and Injector Harness Continuity
1. Check the continuity between terminal (+) and (
−
) of each injector
harness from the coupler of injector harness.
2. If it is not conductive, check the continuity of harness itself and
injector itself.
W1044301
Injector
1. Measure the resistance between injector terminals (2) and (3).
IMPORTANT
■
• Do not disassemble the injector.
W1044800
EGR Valve Operation Check
(Check A)
1. Do the operation check for EGR valve mounted on the engine.
(Connector is also mounted on the EGR valve.)
2. Change the number of revolution after starting the engine. Then,
confirm that the voltage between EGR valve connector terminal
(+) (1) and (
−
) (2) changes. (fluctuation range is approximately
from 1 to 4 V.)
Refer to “Diagnosis Manual”.
(Check B)
1. Dismount the EGR valve from the engine.
2. Confirm that EGR valve is opened after EGR valve connector
terminal (5) is connected to power terminal (4) and EGR valve
connector terminal (4) is connected to power terminal (
−
).
IMPORTANT
■
• Power voltage should be 5 V at this time. And if EGR valve
is not opened, increase the power voltage 1 V by 1 V (max.
12 V). However, energizing at each voltage should be within
5 seconds, and not to increase the voltage any more when
EGR valve is opened.
3. Connect the EGR valve connector to the harness as below and
confirm that the voltage between EGR valve connector terminal
(1) and (2) changes with valve opening operation of step 2.
W1045919
(1) Coupler of Injector Harness
Injector resistance Factory spec. 0.35 to 0.55
Ω
(1) Injector
(2) Injector Terminal (3) Injector Terminal
(1) Output (To confirm that fluctuation
range is from 1 to 4 V)
(2) Ground (GND)
(3) +5 V
(4) EGR Valve Connector Terminal
(5) EGR Valve Connector Terminal
KiSC issued 06, 2007 A