Checking Rail Pressure Sensor; Checking Boost Pressure Sensor - Kubota D1803-CR-E4 Workshop Manual

4. ENGINE

4.21 Checking rail pressure sensor

Tools required
• Diagnosis tool
1. Place the key switch in the ON position.
2. Check the "Actual rail pressure" and "Rail pressure
sensor output voltage" on the diagnosis tool data
monitor.
3. Start the engine.
4. Change the depressed amount of the accelerator
pedal, and check the same items again.
Engine state
Key switch is
ON
Service speci-
fication
After engine
start-up
4.22 Checking boost pressure
sensor
Tools required
• Circuit tester
1. Place the key switch in the ON position.
2. Measure the voltage between the boost pressure
sensor terminal (1) and (4) connector from the
wiring harness side.
3. Start the engine, change the depressed amount of
the accelerator pedal, and check the same items
again.
Engine state
Key switch ON
Service specifi-
After engine start-
cation
up
4-108
Actual rail Output volt-
pressure age
Approx.
0 MPa
Approx. 0.3 V
2
0 kgf/cm
0 psi
Approx.
25.0 to
150 MPa
Approx. 0.7 to
255 to
2.5 V
2
1520 kgf/cm
3630 to
21700 psi
Output voltage
Approx. 1.0 V
Approx. 1.0 to 2.2 V
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4
(1) Terminal pressure signal
(2) Terminal 5V
(3) Terminal temperature signal
4. Set the key switch to the OFF position.
5. Disconnect the boost pressure sensor connector
from the socket.
6. Place the key switch in the ON position.
7. Measure the voltage between boost pressure
sensor terminal (2) and (4) connector (from the
wiring harness side).
Terminal 5V (2)
Service specifi-
and terminal
cation
ground (3)
NOTE
• If the measurement is out of the service
specification, replace the boost pressure
sensor.
SERVICING
4. Checking and adjusting
(4) Terminal ground
(a) Pin assginment
Approx. 5 V
KiSC issued 12, 2018 A