Kubota M108S, Workshop Manual

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1-M19
M108S, WSM ENGINE
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Injector Actuation Circuit
In order to improve injector responsiveness, the
actuation voltage has been changed to high voltage,
speeding up both solenoid magnetization and the
response of the TWV. The charge circuit in the engine
ECU (5) raises each battery voltage to approximately
110V, which is supplied to the injector (1) by signal from
the engine ECU (5) to actuate the injector (1).
W1017965
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Injector with QR Codes
QR (Quick Response) codes have been adopted to
enhance correction precision. The QR code (1), which
contains the correction data of the injector, is written to
the engine ECU. QR codes have resulted in a
substantial increase in the number of fuel injection
quantity correction points, greatly improving injection
quantity precision. In addition to injection quantity
correction data, the QR code (1) contains the part
number and the product number, which can be read at
extremely high speeds.
W1018198
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Handling Injectors with QR Codes (Reference)
Injectors with QR codes have the engine ECU recognize and correct the injectors, so when an injector or the engine
ECU is replaced, it is necessary to register the injector's ID code in the engine ECU.
1) Replacing the Injector
Engine ECU (1) cannot recognize the spare injector
(2) electrically.
It is necessary to register the ID code of the spare
injector (2) that has been replaced in the engine ECU (1).
W1023219
2) Replacing the Engine ECU
Spare engine ECU (1) cannot recognize the vehicle-
side injectors (2) electrically.
It is necessary to register the ID codes of all the
vehicle injectors (2) in the spare engine ECU (1).
W1023367
(1) Injector
(2) Constant Amperage Circuit
(3) High Voltage Generation
Circuit
(4) Control Circuit
(5) Engine ECU
(1) QR Code (2) ID Code
(1) Engine ECU (2) Spare Injector
(1) Spare Engine ECU (2) Vehicle-side Injectors
KiSC issued 06, 2007 A