Accord 1986 and Prelude 1986-89
1. Disconnect the connector and remove the sensor from the intake manifold.
2. To check the sensor, place it in cold water, slowly heating it. Measure the resistance between the terminals. It should be 0.98-1.34 kOhm at 40°C and 0.22-0.35 at 80°C.
3. If the resistance is not within the norm, replace the sensor.