Kubota V3800-CR-TE4 Diagnosis Manual page 191

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-40 and A-24
and between terminals A-41 and A-16.
2. Next, start the engine, change the depressed amount of the
accelerator pedal, and check the same items again.
Depends on the rotation speed, load (After warm-up)
1. When stopped: Approx. 1.0 V
Factory
2. When idling: 1.65 to 1.80 V
specification
3. During no-load maximum speed: 2.50 to 2.85 V
4. During acceleration: 2.5 to 3.3 V
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 rail pressure sensor terminals -
1".
3. Measure the Voltage Between Rail Pressure Sensor
Terminals - 1
1. Place the key switch in the ON position, and measure the
voltage between terminals (2) and (3) of the rail pressure sensor
at the wiring harness side.
2. Next, start the engine, change the depressed amount of the
accelerator pedal, and check the same items again.
Depends on the rotation speed, load (After warm-up)
1. When stopped: Approx. 1.0 V
Factory
2. When idling: 1.65 to 1.80 V
specification
3. During no-load maximum speed: 2.50 to 2.85 V
4. During acceleration: 2.5 to 3.3 V
OK Check the wiring harness (between ECU terminals A-40 / A-41 and
sensor terminal (2)). → Repair the faulty area.
NG Go to "4. Measure the voltage between rail pressure sensor terminals -
2".
(1) Terminal A-VCC1
(2) Terminal PFUEL
(3) Terminal A-GND6
1-S164
COMMON RAIL SYSTEM
9Y1200192CRS0698US0
(a) Terminal Layout
9Y1200192CRS0699US0
KiSC issued 05, 2012 A