Gauges - wsm B2420 Workshop Manual

B2420, WSM

(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.
(1) U Terminal
(2) GND Terminal
(3) IGN Terminal
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.
Resistance
Reference
(Sensor terminal
value
– its body)
A: Float at upper most position
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.
Lead terminal -
Voltage
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 faulty.
Resistance (Sensor
Reference value
terminal – Chassis)
(1) Coolant Temperature Sensor
9-S27
ELECTRICAL SYSTEM
(4) U Terminal (Temperature)
(5) GND Terminal (Temperature)
(6) IGN Terminal (Temperature)
9Y1210436ELS0063US0
Float at
upper-most 1 to 5 Ω
position A
Float at
lower-most 103 to 117 Ω
position B
B: Float at lower most position
9Y1210436ELS0064US0
Approx. battery voltage
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)
(a) From Temperature Gauge
9Y1210436ELS0065US0
KiSC issued 06, 2012 A