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Overdrive will not engage most times?

Tiny
BEENTHEREDONETHAT
  • MEMBER
  • 1991 MAZDA B2200
  • 2.2L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 75,000 MILES
99% of the time my overdrive won't engage at highway speeds yet the light showing it's engaged on the dash works when button pressed in on the shifter. Any suggestions or wiring to check? Even a wiring diagram would be great as well. I appreciate any help. Thank you!
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Saturday, August 12th, 2023 AT 5:15 AM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,973 POSTS
I would check the transmission fluid and service the unit if the fluid is dirty/burnt. Here are the wiring diagrams you have requested. Check out the images (below). Please let us know what happens.
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Saturday, August 12th, 2023 AT 3:44 PM
Tiny
BEENTHEREDONETHAT
  • MEMBER
  • 2 POSTS
Update: serviced the transmission and just to let you know it didn't help the issue. What I did find is a melted connector against the exhaust that leads to the side of the transmission looks like a disc against the trans casting but assume it's a solenoid. Been working on the fleet so I'll be attacking it soon and will update again. Thank you for the wiring diagram, it will come in handy!
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Thursday, September 21st, 2023 AT 1:02 AM
Tiny
KEN L
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  • 42,973 POSTS
It sounds like you found the problem, please let me know if the wiring fixes it.
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Saturday, September 23rd, 2023 AT 10:24 AM

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