Checking the performance of the TA sensor (Honda Accord 3)

The intake air temperature sensor (IATS) is a thermistor (a resistor whose resistance depends on temperature). The thermistor's resistance decreases as the incoming air temperature increases, as shown in the figure.

Turn on the ignition.

Measure the voltage between pins 3 (Red (+)) and 32 (Black (-)).



If the voltage is in the range of 2-4 V, then the TA sensor is normal.

Otherwise, turn off the ignition.

Next, disconnect the 2-pin connector on the TA sensor.

Turn on the ignition.

Measure the voltage between pins 3 (Red (+)) and 32 (Black (-)).

If the voltage is not approximately 5 V, the control unit should be replaced and retested. If the voltage is approximately 5 V, then the resistance between the two contacts of the TA sensor should be measured.

If the resistance is not in the range of 1-4 kOhm, then the TA sensor should be replaced.

If the resistance is in the range of 1-4 kOhm, then you should measure the voltage between the Red contact (+) and ground.

If the voltage is approximately 5 V, then the break in the Black wire between the TA sensor and point G2 should be repaired.

Otherwise, you should repair the break or short circuit of the Red conductor between the TA sensor and terminal 3 of the control unit.

(The original is located on the website «hondabook»)