Intake Air Temperature Sensor Resistance Inspection

• Remove the intake air temperature sensor (see Intake Air Temperature Sensor Removal).
• Suspend the sensor [A] in a container of machine oil so that the heat-sensitive portion is submerged.
• Suspend a thermometer [B] with the heat-sensitive portion [C] located in almost the same depth with the sensor.

NOTE

The sensor and thermometer must not touch the container 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 following.

Intake Air Temperature Sensor Resistance Standard: 5.4 6.6 kΩ at 0В°C
(32В°F) 0.29 0.39 kΩ at 80В°C (176В°F)

• If the reading is out of the standard, replace the sensor.
• If the reading is within the standard, but the problem still exists, replace the ECU (see ECU Removal/Installation in the Fuel System (DFI) chapter).

Intake Air Temperature Sensor Circuit

1. ECU

2. Intake Air Temperature Sensor