Materials:
* Multimeter
* Wrench or socket to remove solenoid
Procedure:
1. Make sure the transmission is in park.
2. Locate the torque converter lock-up solenoid.
It is usually located on the transmission housing and has an electrical connector.
3. Disconnect the electrical connector.
Gently pull the connector without damaging the wires.
4. Remove the solenoid.
Use a wrench or socket to remove the bolts or nuts that secure the solenoid. Carefully remove the solenoid.
5. Check the solenoid resistance.
Set the multimeter to resistance measurement mode (?). Place multimeter leads on the two solenoid terminals.
Normal resistance: 10-20 ohms
*If the resistance is 0 ohms: the solenoid is shorted.
* If the resistance is infinity: the solenoid is open.
6. Check the solenoid for voltage.
Connect one multimeter probe to the positive terminal of the solenoid and the other probe to the transmission housing. Set the multimeter to voltage (V) mode.
Start the engine and shift into a drive gear (eg D).
Normal voltage: 12-14V
*If there is no voltage: there is a problem with the electrical connector, wiring, or transmission control module (TCM).
*If voltage is present: the solenoid is probably faulty.
7. Check the solenoid for leaks.
Place your finger on the hole in the solenoid. You shouldn’t feel any air leaking.
*If there is a leak: the solenoid is not holding air and needs to be replaced.
Note:
For an accurate diagnosis, it is recommended to consult your vehicle’s repair manual, as specific values may vary between models.