my Toyota Corolla E170 (2013-2019) transmission slips when shifting how do I fix it

Toyota Corolla E170 (2013-2019)

Error Codes

3-5 hours

Time

medium

Difficulty

high

Severity

3 min read

587 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix transmission slipping issues in Toyota Corolla E170 (2013-2019). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Transmission

Estimated Time

3-5 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the vehicle to cool down before starting work on the transmission.

Symptoms

•Transmission slips when shifting between gears
•Unresponsive acceleration
•Engine revs higher than normal without corresponding speed increase
•Check engine light may be illuminated
•Fluid leaks under the vehicle
•Harsh or delayed shifting

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related codes.
2
Check the transmission fluid level and condition; look for signs of contamination or burnt smell.
3
Inspect for any external leaks in the transmission system, including seals and gaskets.
4
Visually examine the transmission linkage and cables for any signs of wear or misalignment.
5
Test the operation of the transmission solenoids using a multimeter for proper resistance values.
6
Verify the throttle position sensor (TPS) function, as improper readings can affect shifting.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Socket set
•Multimeter
•Transmission fluid pump
•Torque wrench

Parts Required

•Transmission fluid (Toyota WS)
•Transmission filter
•Transmission pan gasket
•Solenoids (if needed)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related codes.
2
Check the transmission fluid level and condition; look for signs of contamination or burnt smell.
3
Inspect for any external leaks in the transmission system, including seals and gaskets.
4
Visually examine the transmission linkage and cables for any signs of wear or misalignment.
5
Test the operation of the transmission solenoids using a multimeter for proper resistance values.
6
Verify the throttle position sensor (TPS) function, as improper readings can affect shifting.

Solution

1. Preparation

Gather all tools and parts required for the repair.
Ensure the vehicle is parked on a flat surface, and engage the parking brake.
Disconnect the battery to prevent any electrical shorts during the repair.

2. Check and Replace Transmission Fluid

Tools Required: Socket set, funnel, transmission fluid pump.
Sub-steps:
1. Remove the transmission dipstick and check the fluid level; add fluid if low.
2. If the fluid is discolored or burnt, drain the transmission fluid by removing the drain plug.
3. Replace with manufacturer-recommended transmission fluid (e.g., Toyota WS fluid).
4. Reinstall the drain plug and refill the transmission fluid through the dipstick tube.

3. Inspect and Replace Transmission Filter

Tools Required: Socket set, gasket scraper, torque wrench.
Sub-steps:
1. Locate and remove the transmission pan bolts; carefully detach the pan.
2. Remove the old filter and replace it with a new one, ensuring it is seated properly.
3. Clean the transmission pan and install a new gasket.
4. Reinstall the transmission pan and torque bolts to manufacturer's specifications.

4. Test and Replace Solenoids (if necessary)

Tools Required: Multimeter, socket set.
Sub-steps:
1. Disconnect the electrical connectors from the transmission solenoids.
2. Use a multimeter to check the resistance of each solenoid; compare against specifications.
3. If any solenoid is out of range, remove and replace with a new unit.
4. Reconnect the electrical connectors.

5. Final Checks

Reconnect the battery.
Start the vehicle and allow it to reach operating temperature.
Shift through all gears to ensure proper engagement and operation.