why does my Toyota Corolla E170 (2013-2019) have a harsh transmission shift?

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

539 words

Problem Statement

Learn how to diagnose and fix harsh transmission shifts in the 2013-2019 Toyota Corolla E170. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Transmission

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before opening the transmission system.

Symptoms

•Noticeable jolt during gear changes
•Delayed engagement when shifting from park to drive
•Increased engine RPMs during shifts
•Unusual noises (clunking or grinding) during shifts
•Warning lights illuminated on the dashboard (e.g., check engine light)
•Decreased fuel efficiency

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related trouble codes.
2
Check transmission fluid level and condition; look for signs of contamination or burning smell.
3
Inspect the transmission fluid cooler for leaks or blockages.
4
Examine the transmission mounts for wear or damage.
5
Test the throttle position sensor (TPS) and mass airflow sensor (MAF) for proper function.
6
Check for software updates or reprogramming needs for the transmission control module (TCM).

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
•Transmission fluid pump
•Torque wrench
•Jack and jack stands

Parts Required

•Transmission fluid (Toyota ATF-WS)
•Transmission pan gasket
•Transmission filter (if applicable)
•Transmission mounts (if damaged)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related trouble codes.
2
Check transmission fluid level and condition; look for signs of contamination or burning smell.
3
Inspect the transmission fluid cooler for leaks or blockages.
4
Examine the transmission mounts for wear or damage.
5
Test the throttle position sensor (TPS) and mass airflow sensor (MAF) for proper function.
6
Check for software updates or reprogramming needs for the transmission control module (TCM).

Solution

1. Preparation

Gather tools and parts needed for the repair.
Ensure the vehicle is on a level surface and securely lifted using jack stands.
Disconnect the battery to prevent electrical shorts.

2. Check and Replace Transmission Fluid

Step 1: Locate the transmission dipstick and remove it.
Step 2: Use a funnel to add the recommended transmission fluid if low. Check the owner’s manual for the correct type (usually Toyota ATF-WS).
Step 3: If fluid is burnt or contaminated, proceed to drain the transmission fluid.
- Tools Required: Socket set, transmission fluid pump.
Step 4: Remove the transmission pan bolts and lower the pan carefully to avoid damage.
Step 5: Clean the transmission pan and replace the filter if necessary.
Step 6: Reinstall the pan with a new gasket and torque bolts to manufacturer specifications.

3. Inspect and Replace Transmission Mounts

Step 1: Visually inspect the transmission mounts for cracks or excessive wear.
Step 2: If damaged, support the transmission and remove the faulty mount bolts.
Step 3: Replace with new mounts and torque bolts to specifications.

4. Update Transmission Control Module

Step 1: Connect a professional scan tool to the OBD-II port.
Step 2: Check for any available software updates for the TCM.
Step 3: Follow the tool’s prompts to apply any updates.