16-94 ELECTRICAL SYSTEM
Switches and Sensors
Water Temperature Sensor Inspection
Remove the water temperature sensor (see Wa-
ter Temperature Sensor Removal/Installation in the
Self-Diagnosis System chapter).
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 a digital meter, measure the internal resistance of
If the digital meter does not show the specified values,
replace the sensor.
Water Temperature Sensor Resistance
*: Reference Information
Oxygen Sensor Removal
Never drop the sensor especially on a hard surface.
Such a shock to the sensor can damage it.
Do not pull strongly, twist, or bend the oxygen sen-
sor lead. This may cause the wiring open.
Remove the fuel tank (see Fuel Tank Removal in the Fuel
System (DFI) chapter).
Disconnect the oxygen sensor lead connector [A].
Remove the oxygen sensor [A].