transmission wiring diagrams please

1999 TOYOTA COROLLA
203,000 MILES • 1.8L • 2WD • AUTOMATIC
Avatar
BRETT COONEY
  • MEMBER
  • 2 POSTS
When accelerating gearbox goes through all the gears but as soon as the car reaches eighty kmph the lock up torque converter engages. It is like changing from third to fifth. goes like a dog after eighty unless you have your foot on the floor. Is there a way to manually control the lock up by a separate switch? The overdrive off switch drops it back to third gear. It would be nice to be able to use fourth gear without lock up on a slight hill.
Aug 25, 2018 at 8:26 PM
Advertisement
Avatar
STRAILER
  • CERTIFIED EXPERT
  • 53,854 POSTS
Can I ask if the speedometer is working correctly? I sounds like you have VSS that might be off. We should run the codes to see whats going on.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run down this guide and report back.

Cheers, Ken
May 26, 2021 at 6:43 PM
Avatar
BRETT COONEY
  • MEMBER
  • 2 POSTS
The speedometer is working normally. Everything seem to work alright until the car reaches 80 mph. I have a diagnostic machine but I cannot find the plug, where it should be is blank. I will keep looking. Found the diagnostic plug under the bonnet but my cable does not fit. I have no warning lights on either. I am thinking of looking up wiring diagrams and see if I can isolate the solenoid.
May 26, 2021 at 6:43 PM
Advertisement
Avatar
STRAILER
  • CERTIFIED EXPERT
  • 53,854 POSTS
Here is the transmission wiring diagrams and a guide to help you test the circuits. I sounds like the PCM might be bad but lets test things first. Here is the ALDL data link connector location as well.

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (below). Please let us know what happens.

Cheers, Ken
May 26, 2021 at 6:43 PM