5-S18
ZD18(F) · ZD21(F) · ZD28(F), WSM
ELECTRICAL SYSTEM
[5] GAUGES
(1) Checking
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.
W1025023
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.
W1025197
Fuel Gauge and Coolant Temperature Gauge Operation
1. Remove the under panel.
2. Turn the main switch to ON position. Measure the voltage with a
voltmeter across the I terminal (3) and GND terminal (2) of the
gauge.
3. If approx. battery voltage is indicated, the ignition and ground
lead connections are good.
4. Turn the main switch to OFF position. Connect a jumper lead
between S terminal (1) and GND terminal (2) of the gauge.
5. Turn the main switch to ON position. If the gauge resisters a full
scale reading under those conditions, the gauge is good. If less
than full scale reading is indicated, the gauge is defective and
should be replaced.
W1025568
Resistance
(Sensor terminal
- its body)
Reference
value
Float at upper-
most position
1 to 5 Ω
Float at lower-
most position
103 to 117 Ω
Voltage Lead terminal - Chassis Approx. battery voltage
Resistance
(Sensor terminal
- Chassis)
Reference
value
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)
(1) Coolant Temperature Sensor (a) From Temperature Gauge
(1) S Te r m i n a l
(2) GND Terminal
(3) I Terminal
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