Remove the ECT sensor from the intake manifold. Be careful not to damage
the plastic portion or the electrodes of the ECT sensor when unscrewing the
sensor from the manifold.
Fig. 1: Place the ECT sensor into a pot of water
and measure the resistance of its two terminals while heating the
water
With the temperature sensing portion of the ECT sensor immersed in water,
check the resistance between the two terminals. Slowly heat the water up and
watch to see the change in resistance. With the water at 32°F (0°C)
the resistance should be 5.9 kilohms, at 68°F (20°C) the resistance
should be 2.5 kilohms, at 104°F (40°C) the resistance should be
1.1 kilohms, and at 176°F (80°C) the resistance should be 0.3 kilohms.
If the resistance deviates from the standard value greatly, replace the sensor
with a new one.
