Kubota V3800-CR-TE4 Diagnosis Manual page 281

V3800-CR-TE4,V3800-CR-TIE4, DM
2. Measure the ECU Terminal Voltage
1. Move the key switch from the OFF to the ON position, and
measure the voltage between ECU terminals A-66 and A-59.
Factory specification
Engine state
Key switch ON
OK Check the harness connectors and ECU pins.
OK Faulty ECU → Replace.
NG Repair or replace the wiring harness, or replace the ECU.
NG Go to "3. Measure the Voltage Between Differential Pressure Sensor
Terminals".
3. Measure the Voltage Between Differential Pressure Sensor
Terminals
1. Place the key switch in the ON position, and measure the
voltage between terminals (2) and (3) of the differential pressure
sensor at the wiring harness side.
Factory specification
Engine state
Key switch ON
OK Check the wiring harness (between ECU terminal A-66 and sensor
terminal (3)). → Repair the faulty area.
NG Go to "4. Measure the Voltage Between Differential Pressure Sensor
Terminals".
(1) Terminal DPS-VCC
(2) Terminal DPS-GND
(3) Terminal DPS
4. Measure the Voltage Between Differential Pressure Sensor
Terminals
1. Set the key switch to the OFF position, and unplug the
differential pressure sensor connector from the socket.
2. Place the key switch in the ON position, and measure the
voltage between terminals (1) and (2) of the differential pressure
sensor connector (at the wiring harness side).
Factory
Approx. 5 V
specification
OK Check the wiring harness connector and sensor pins.
OK Faulty differential pressure sensor → Replace.
NG 1. Repair or replace the wiring harness.
2. Replace the differential pressure sensor.
NG Go to "5. Measure the ECU Terminal Voltage".
(1) Terminal DPS-VCC
(2) Terminal DPS-GND
(3) Terminal DPS
1-S254
COMMON RAIL SYSTEM
Output voltage
Approx. 0.7 V
9Y1200192CRS0815US0
Output voltage
Approx. 0.7 V
(a) Differential Pressure Sensor
Connector
9Y1200192CRS0854US0
(a) Differential Pressure Sensor
Connector
9Y1200192CRS0855US0
KiSC issued 05, 2012 A