Accord 1986 and Prelude 1986-89
1. Disconnect the connector and remove the sensor from the intake manifold.
2. To test the sensor, place it in cold water while heating it slowly. 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 out of specification, replace the sensor.