16-102 ELECTRICAL SYSTEM
Switches and Sensors
Water Temperature Sensor Inspection
Remove the water temperature sensor (see Water Tem-
perature Sensor Removal/Installation in the Fuel System
Suspend the sensor [A] in a container of coolant so that
the threaded portion is submerged.
Suspend an accurate thermometer [B] with temperature
sensing portions [C] located in almost the same depth.
The sensor and thermometer must not touch the con-
tainer side or bottom.
Place the container over a source of heat and gradu-
ally raise the temperature of the coolant while stirring the
Using the hand tester, measure the internal resistance of
The sensor sends electric signals to the ECU and coolant
temperature gauge in the meter unit.
Measure the resistance across the terminals and the body
(for the gauge) at the temperatures shown in the table.
If the hand tester does not show the specified values, re-
place the sensor.
Water Temperature Sensor
Resistance for ECU [D]
Resistance for Water Temperature Gauge [E]
Speed Sensor Removal
Never drop the sensor, especially on a hard surface.
Such a shock to the sensor can damage it.
Water Pipe (see Alternator Cover Removal)
Water Hose (see Starter Motor Removal)
Speed Sensor Bolt [B]
Speed Sensor [C]