Repair Guide for Toyota Corolla (1990) - Transmission Shifting Issues
Transmission shifting issues are less common but can occur in any car, including the 1990 Toyota Corolla. This comprehensive guide will provide diagnostic steps, potential pitfalls, and helpful tips on addressing this problem successfully.
Tools Required
- Screwdriver set
- Sockets and ratchet set
- Drain pan
- Transmission fluid pump
- New transmission fluid
- Jack and jack stands
- Torque wrench
Diagnostic Steps
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Check the Transmission Fluid
The most common reason cars have transmission shifting problems is due to low or dirty transmission fluid. Use the dipstick to check both the fluid level and color. If it's not a clear, almost transparent red color, it's time to change the oil.
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Look for Leaks
If you find the transmission fluid level consistently low, look for leaks at the seals around the pan and the output shaft. A dark red fluid on your driveway or garage floor would indicate this.
Repair Procedure
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Drain the Fluid
Place a drain pan under the transmission pan and unscrew the drain plug on the bottom to let the fluid flow out. Allow it to drain completely before moving to the next step.
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Remove the Transmission Pan
Use your screwdriver and sockets to remove the bolts holding the transmission pan in place. Take care; some fluid may still be in the pan. Remove the pan and set it aside.
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Clean the Pan
Clean the pan thoroughly, removing any grime or debris. This step is crucial to prevent contamination of the new fluid.
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Replace the Transmission Fluid
Use a transmission fluid pump to insert new fluid into the transmission via the filler tube. Replace the pan and screws, then check the fluid level with the dipstick. Fill to the indicated level.
Potential Pitfalls and Tips
- Always ensure the vehicle is safely lifted and supported with jack stands while you work under it.
- Be sure to clean the pan and change the filter; failure to do so could lead to future transmission issues.
- Use the right type of transmission fluid for your vehicle. Check the vehicle's manual.
- Do not overfill the transmission. This can cause shifting problems or damage the transmission.