3-54 FUEL SYSTEM (DFI)
Inlet Air Temperature Sensor (Service Code 13)
Sensor Resistance Inspection
Remove the inlet air temperature sensor (see this sec-
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.
Inlet Air Temperature Sensor Resistance
If the measurement is out of the range, replace the sensor.
If the measurement is within the specified, check the ECU
for its ground and power supply (see ECU section in this
Clean off machine oil that inadvertently gets on the sen-
sor, especially on the terminals with a high-flush point sol-
6.6 kΩ at 0°C (32°F)
2.86 kΩ at 20°C (68°F)
0.39 kΩ at 80°C (176°F)
Y. Inlet Air Temperature Sensor