my Toyota Highlander Third Generation (2014-2019) has a hard shifting issue what to check

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

580 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 hard shifting issues in Toyota Highlander 2014-2019. Step-by-step guide with diagnostic procedures 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 pan to prevent burns.

Symptoms

•Noticeable jerk or lurch during gear changes
•Delayed engagement when shifting from park to drive/reverse
•Unusual noises during shifting (clunking or grinding)
•Check engine light illuminated
•Increased RPMs without corresponding acceleration

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related faults.
2
Check the transmission fluid level and condition (color, smell, and presence of debris).
3
Inspect the transmission control module (TCM) for any signs of damage or corrosion.
4
Examine the throttle position sensor (TPS) for proper operation and adjustment.
5
Test the transmission solenoids for resistance and proper function.
6
Inspect the engine mounts and transmission mounts for wear or damage.

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
•Torque wrench
•Multimeter
•Screwdrivers

Parts Required

•Automatic Transmission Fluid (ATF)
•Transmission filter and gasket
•Transmission solenoids (if faulty)
•Throttle position sensor (if faulty)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related faults.
2
Check the transmission fluid level and condition (color, smell, and presence of debris).
3
Inspect the transmission control module (TCM) for any signs of damage or corrosion.
4
Examine the throttle position sensor (TPS) for proper operation and adjustment.
5
Test the transmission solenoids for resistance and proper function.
6
Inspect the engine mounts and transmission mounts for wear or damage.

Solution

1. Preparation

Gather tools and parts required.
Ensure the vehicle is on a flat surface and securely lifted if necessary.
Disconnect the battery to avoid electrical shorts.

2. Check and Replace Transmission Fluid

Sub-steps:
1. Locate the transmission dipstick and remove it.
2. Check the fluid level; if low, add the appropriate type of ATF (Automatic Transmission Fluid) as specified in the owner’s manual.
3. If fluid is dark or burnt, proceed to drain and replace the fluid.
4. Remove the transmission pan (if necessary) to access the filter.
5. Replace the transmission filter and gasket.
6. Refill the transmission with new ATF through the dipstick tube.

3. Inspect and Replace Transmission Solenoids

Sub-steps:
1. Locate the transmission solenoids; typically found on or near the valve body.
2. Disconnect the electrical connectors and remove the solenoids.
3. Test each solenoid using a multimeter for proper resistance (refer to specifications).
4. Replace any faulty solenoids with new ones.

4. Throttle Position Sensor Adjustment

Sub-steps:
1. Locate the TPS on the throttle body.
2. Disconnect the electrical connector and remove the TPS.
3. Using a multimeter, measure the voltage output of the TPS while moving the throttle plate.
4. If readings are out of range, adjust the TPS position or replace it if necessary.
5. Reconnect the electrical connector.

5. Reassemble and Test

Sub-steps:
1. Reattach any components removed during the process.
2. Reconnect the battery.
3. Start the engine and allow it to reach operating temperature.
4. Test drive the vehicle to ensure smooth shifting and confirm repairs.