Engine Oil Pressure Switch; Coolant Temperature Sensor - Kubota B2301 Workshop Manual

B2301, B2601, WSM

(2) Engine Oil Pressure Switch

(3) Coolant Temperature Sensor

Engine Oil Pressure Switch Continuity
1. Measure the resistance with an ohmmeter across the switch
terminal and the chassis.
2. If 0 Ω is not indicated in the normal state, the switch is damaged.
3. If infinity is not indicated at pressure over 49 kPa (0.50 kgf/cm
7.1 psi), the switch is damaged.
In normal state
Resistance (Switch
At pressure over
terminal – Chassis)
approx. 49 kPa
(0.50 kgf/cm
(1) Engine Oil Pressure Switch
Coolant Temperature Sensor
1) Lead Terminal Voltage
1. Disconnect the lead from the coolant temperature sensor after
turning the key switch OFF.
2. Turn the key switch ON and measure the voltage with a
voltmeter across the lead terminal and the chassis. If the
voltage differs from the battery voltage, the wiring harness fuse
or coolant temperature gauge is damaged.
Voltage Lead terminal – Chassis
2) Sensor Continuity
1. Measure the resistances with an ohmmeter across the sensor
terminal and the chassis.
2. If the reference value is not indicated, the sensor is damaged.
Resistance
Reference
(Sensor terminal –
value
Chassis)
Coolant temperature
Tightening torque
sensor
(1) Coolant Temperature Sensor
8-S21
ELECTRICAL SYSTEM
0 Ω
Infinity
2
, 7.1 psi)
9Y1211156ELS0038US0
Approx. 5 V
Approx. 12.2 Ω at 130 °C (266 °F)
Approx. 23.6 Ω at 105 °C (221 °F)
Approx. 51.9 Ω at 80 °C (176 °F)
Approx. 153.9 Ω at 50 °C (122 °F)
11.8 to 17.6 N·m
1.20 to 1.80 kgf·m
8.68 to 13.0 lbf·ft
(a) From Temperature Gauge
9Y1211156ELS0039US0
KiSC issued 11, 2014 A
2
,