ELECTRICAL SYSTEM
B2420, WSM
9-S27
(15) Gauges
Fuel Gauge and Coolant Temperature Gauge Continuity
1. Remove the meter panel from the tractor.
2. Check the continuity with an ohmmeter across the U terminal (1)
and IGN terminal (3) and across the U terminal (1) and GND
terminal (2).
3. If infinity is indicated, the coolant temperature sensor is faulty.
4. Check the continuity with an ohmmeter across the U terminal (4)
and IGN terminal (6) and across the U terminal (4) and GND
terminal (5).
5. If infinity is indicated, the fuel gauge is faulty.
9Y1210436ELS0063US0
Fuel Level Sensor
1) Sensor Continuity
1. Remove the fuel level sensor from the fuel tank.
2. Measure the resistance with an ohmmeter across the sensor
terminal and its body.
3. If the reference values are not indicated, the sensor is faulty.
9Y1210436ELS0064US0
Coolant Temperature Sensor
1) Lead Terminal Voltage
1. Disconnect the lead from the coolant temperature sensor after
turning the main switch off.
2. Turn the main 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 faulty.
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 faulty.
9Y1210436ELS0065US0
(1) U Terminal
(2) GND Terminal
(3) IGN Terminal
(4) U Terminal (Temperature)
(5) GND Terminal (Temperature)
(6) IGN Terminal (Temperature)
Resistance
(Sensor terminal
– its body)
Reference
value
Float at
upper-most
position A
1 to 5 Ω
Float at
lower-most
position B
103 to 117 Ω
A: Float at upper most position B: Float at lower most position
Voltage
Lead terminal -
Chassis
Approx. battery voltage
Resistance (Sensor
terminal – Chassis)
Reference value
Approx. 161 Ω at
120 °C (248 °F)
Approx. 27.4 Ω at
100 °C (212 °F)
Approx. 51.9 Ω at
80 °C (176 °F)
Approx. 153.9 Ω at
50 °C (122 °F)
(1) Coolant Temperature Sensor (a) From Temperature Gauge
To Next Page
Loading...
