3-56 FUEL SYSTEM (DFI)
Water Temperature Sensor (Service Code 14)
Sensor Resistance Inspection
Remove the water temperature sensor (see this section).
Suspend the sensor [A] in a container of machine oil so
that the heat-sensitive portion and threaded portion are
Suspend a thermometer [B] with the heat-sensitive por-
tion [C] located in almost the same depth with the sensor.
The sensor and thermometer must not touch the con-
tainer side or bottom.
Place the container over a source of heat and gradually
raise the temperature of the oil while stirring the oil gently
for even temperature.
Using a digital meter, measure the internal resistance
of the sensor across the terminals at the temperatures
shown in the table.
Water Temperature Sensor Resistance
If the measurement is out of the range, replace the sensor.
If the measurement is within the specified, the ECU is
suspect. Replace the ECU.
Clean off machine oil that inadvertently gets on the sen-
sor, especially on the terminals with a high-flush point sol-
3.112 kΩ at 20°C (68°F)
1.049 kΩ at 50°C (122°F)
0.253 kΩ at 100°C (212°F)
Z. Water Temperature Sensor