Measure The Resistance Between Terminals; Check The Sensor; Measure The Ecu Terminal Voltage - Kubota V3800-CR-TE4 Diagnosis Manual

V3800-CR-TE4,V3800-CR-TIE4, DM

2. Measure the Resistance Between Terminals

1. Place the key switch in the OFF position, unplug the ECU wiring
harness connector from the socket, and measure the resistance
between terminals A-10 and A-34 of the connector.
Factory specification
Temperature
20 °C (68 °F)
40 °C (104 °F)
60 °C (140 °F)
80 °C (176 °F)
OK Go to "4. Measure the ECU Terminal Voltage".
NG Go to "3. Check the sensor".

3. Check the Sensor

1. Turn the key switch OFF, remove the connector from the sensor
side and measure the resistance between the terminals on the
sensor side.
Factory specification
Temperature
20 °C (68 °F)
40 °C (104 °F)
60 °C (140 °F)
80 °C (176 °F)
OK Wiring harness open circuit or connector fault → Check and repair.
NG Intake air temperature sensor fault → Replace the mass air flow sensor.
(1) Terminal Power (+12 V)
(2) Terminal AFS-GND
(3) Terminal AFS

4. Measure the ECU Terminal Voltage

1. Plug the ECU wiring harness connector into socket again,
unplug the sensor connector, and measure the voltage between
ECU terminals A-10 and A-34 at the ECU side.
Factory
Approx. 5 V
specification
OK The ECU connector is faulty or its wiring harness is shorted.
NG Confirm by using other sensors that there is no ground short malfunction
before replacing the ECU.
1-S128
COMMON RAIL SYSTEM
Resistance
Approx. 2.43 kΩ
Approx. 1.15 kΩ
Approx. 0.587 kΩ
Approx. 0.321 kΩ
9Y1200192CRS0668US0
Resistance
Approx. 2.43 kΩ
Approx. 1.15 kΩ
Approx. 0.587 kΩ
Approx. 0.321 kΩ
(4) Terminal IATS
(5) Terminal IATS-GND
9Y1200192CRS0669US0
9Y1200192CRS0670US0
KiSC issued 05, 2012 A