How to Test a Transmission Out of the Car

Introduction

A transmission is a complex piece of machinery that can be difficult to diagnose when it’s not working properly. If you’re having problems with your transmission, it’s important to have it checked out by a qualified mechanic. However, if you’re comfortable working on your own car, you can test the transmission yourself by following the steps below.

What You’ll Need

• A transmission jack or lift
• A torque wrench
• A fluid pump
• Transmission fluid
• A multimeter

Step 1: Remove the Transmission

The first step is to remove the transmission from the car. This can be a difficult task, so it’s important to follow the instructions in your car’s service manual carefully. Once the transmission is removed, you can place it on a transmission jack or lift.

Step 2: Inspect the Transmission

Once the transmission is out of the car, you can inspect it for any obvious damage. Look for any cracks, leaks, or loose parts. If you find any damage, you’ll need to have the transmission repaired or replaced.

Step 3: Check the Fluid Level

The next step is to check the transmission fluid level. The fluid level should be between the “full” and “add” marks on the dipstick. If the fluid level is low, you’ll need to add some fluid. Be sure to use the type of fluid that is specified in your car’s service manual.

Step 4: Test the Pressure

Once the fluid level is correct, you can test the pressure. To do this, you’ll need to connect a pressure gauge to the transmission. The pressure should be between 100 and 150 psi. If the pressure is too low, you may have a leak in the transmission. If the pressure is too high, you may have a blocked filter or a faulty pressure regulator.

Step 5: Test the Shift Solenoids

The shift solenoids are responsible for shifting the transmission. To test the shift solenoids, you’ll need to use a multimeter. The resistance of each solenoid should be between 10 and 20 ohms. If the resistance is too high or too low, you’ll need to replace the solenoid.

Step 6: Reinstall the Transmission

Once you’ve tested the transmission and made any necessary repairs, you can reinstall it in the car. Be sure to follow the instructions in your car’s service manual carefully. Once the transmission is reinstalled, you can test it by driving the car.

Conclusion

Testing a transmission out of the car can be a difficult task, but it’s not impossible. By following the steps above, you can test the transmission and make sure that it’s working properly.