why does my Toyota Highlander Third Generation (2014-2019) feel like it lurches when driving

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

528 words

Problem Statement

Learn how to diagnose and fix transmission lurching 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

•Always disconnect the battery before working on electrical components.
•Allow the engine to cool before inspecting the engine compartment to avoid burns.

Symptoms

•Lurching sensation when accelerating
•Jerking during gear shifts
•Engine stalling or hesitation
•Poor fuel economy
•Check engine light illuminated
•Unusual noises during acceleration

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission or engine-related issues.
2
Check transmission fluid level and condition, ensuring it is neither low nor contaminated.
3
Inspect engine air filter for blockages that could affect performance.
4
Examine spark plugs for wear or fouling that may cause engine misfires.
5
Test the throttle position sensor (TPS) and mass airflow (MAF) sensor for proper function.
6
Inspect the transmission for any signs of slippage or irregular behavior.

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
•Transmission fluid
•Funnel
•Spark plug socket
•Torque wrench
•Ratchet
•MAF cleaner
•Screwdrivers

Parts Required

•New spark plugs
•Transmission fluid (if low)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission or engine-related issues.
2
Check transmission fluid level and condition, ensuring it is neither low nor contaminated.
3
Inspect engine air filter for blockages that could affect performance.
4
Examine spark plugs for wear or fouling that may cause engine misfires.
5
Test the throttle position sensor (TPS) and mass airflow (MAF) sensor for proper function.
6
Inspect the transmission for any signs of slippage or irregular behavior.

Solution

1. Preparation

Gather tools and materials needed for the repair.
Disconnect the negative battery terminal to avoid electrical shorts.

2. Check Transmission Fluid

Step 1: Locate the transmission dipstick (if equipped).
Step 2: Remove the dipstick and wipe it clean, then reinsert it fully and remove again to check the fluid level and condition.
Step 3: If fluid is low, add the manufacturer-recommended transmission fluid until the proper level is reached.
Tools Required: Transmission fluid, funnel.

3. Replace Spark Plugs

Step 1: Remove the ignition coil to access the spark plugs.
Step 2: Using a spark plug socket, carefully unscrew and remove the old spark plugs.
Step 3: Inspect for wear; replace with new spark plugs of the specified type for your Highlander.
Step 4: Torque the new spark plugs to the manufacturer’s specifications (typically around 13-15 lb-ft).
Tools Required: Spark plug socket, torque wrench, ratchet.

4. Inspect and Clean MAF Sensor

Step 1: Disconnect the MAF sensor connector.
Step 2: Remove the MAF sensor from the air intake duct.
Step 3: Use MAF cleaner to spray and clean the sensor, ensuring no residue remains.
Step 4: Reinstall the MAF sensor and reconnect the electrical connector.
Tools Required: MAF cleaner, screwdrivers.

5. Reset Check Engine Light

Step 1: Reconnect the negative battery terminal.
Step 2: Start the vehicle and use the OBD-II scanner to clear any error codes.
Tools Required: OBD-II scanner.