Question about 1987 Nissan Pathfinder
Some front axle CV shafts have teeth on them that provide a means for the wheel speed sensors to determine wheel speed. I believe the '87 only has rear wheel abs however, which only has one sensor on the pinion at the rear differential, near where the driveshaft bolts on. If a signal from this sensor is no longer being seen by the ABS computer, the computer will turn on the light to indicate a problem. Check and clean connections at the sensor before buying any new parts. The sensor can also be checked for continuity with an ohmmeter; I'm not sure but it's probably in the neighborhood of 60 ohms.
The ABS light will also come on when the fluid level is low in the brake fluid reservoir. Inside the reservoir, beneath the screen, there is a float that goes up and down with the fluid level. It has a small magnet on the bottom of it. When it reaches the bottom of the reservoir, it activates a magnetic switch that lies underneath the reservoir. If you have verified the fluid level, check to make sure that the float is actually floating, and check and clean the magnetic switch and its connector.
Posted on Dec 24, 2010
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Posted on Jan 02, 2017
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