DIY: Shift Solenoid #3 (Shift Lock)

[Mister_Perkins]

Vehicle problem Description:

Car upshifts properly, but doesn't downshift properly.

Things done before pulling the solenoid:

Check the wiring between the SL Solenoid and the ECM Harness plug(Blue / Yellow wire) --- ECM Disconnected from plug

Specs:
.05 V Resistance -- no continuity to body, but continuity total length of wire

With ECM Connected
.05 V Resistance -- Continuity to body


Checked Throttle Position Sensor -- OK
Checked Vacuum Switching Valve -- OK

Checked voltage on DLC for Shift solenoid 1 & 2 while driving -- OK
Checked Resistance on Shift solenoid 1 & 2 -- OK
Checked Shift solenoid 1 & 2 for proper function -- OK

Replaced ECM and Transmission Control with Known Good ECM -- Problem still there

So I went back to the Shift Lock Solenoid, since it is what controls the O/D Lockup function

Using a multimeter, connect your probe to the single terminal thats on the solenoid. Ground the multimeter to the engine or body. You should measure 11-14 Ohms of resistance.

Next, apply voltage to the pin you just probed. You should hear the solenoid clicking.

If you do not hear it clicking or the resistance is higher or lower than 11-14ohms remove the solenoid and replace.

If you have proper resistance but cannot hear the solenoid clicking remove it completely along with the battery and grab two pieces of 12 - 16 gauge wire about 1ft in length.

Next, you wrap one part of the wire around where the bolt that holds the solenoid in place on the transmission. This will be your ground.

After you have a good ground, connect the ground to the (-) Battery terminal. Hook the (+) Battery terminal the the pin on the Solenoid.

If you are lucky, it will just be stuck and this will allow the solenoid to open and close properly. This is exactly what I did to the 92 camry XLE and now it works great!

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