Gauges - wsm STW37 Workshop Manual

STW34, STW37, STW40, WSM

(27) Gauges

Engine Oil Pressure Switch
1. Disconnect the lead (2) from the engine oil pressure switch after
turning the main switch OFF.
2. Turn the main switch ON and connect a jumper lead from the
lead to the chassis.
3. If the engine oil pressure indicator lamp does not light, the panel
circuit or the wiring harness is faulty.
(1) Engine Oil Pressure Switch
(2) Switch Lead
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 value are not indicated, the sensor is faulty.
Resistance
(Sensor terminal Reference value
– its body)
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.
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 faulty.
Resistance
Reference
(Sensor terminal –
value
Chassis)
(1) Coolant Temperature Sensor
9-S40
ELECTRICAL SYSTEM
(a) From Oil Pressure Lamp
9Y1211109ELS0072US0
Float at
upper-most 1 to 5 Ω
position
Float at
lower-most 103 to 117 Ω
position
9Y1211109ELS0073US0
Approx. battery voltage
Approx. 16.1 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
9Y1211109ELS0074US0
KiSC issued 11, 2014 A