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Shift lock solenoid spasming

1.9K views 7 replies 3 participants last post by  71Corolla  
#1 ·
When my '91 4cyl is in park, I can hear the shift lock solenoid switching back and forth randomly, sometimes rapidly. I usually need the shift lock override button to shift out of park, but occasionally it will be unlocked.

Any diagnostic tips? I can't find the shift lock solenoid in any of the circuit schematics in my Haynes manual. Because it's "spasming" instead of stuck, I'm thinking it's a sensor or computer problem rather than the solenoid itself.
 
#8 ·
The NSS aka neutral safety switch is on the front of the transmission left side near the battery. Worst case you can remove/disable the entire shift lock assembly 1987-1988 model didn't have it anyway.