Toyota Highlander Third Generation (2014-2019) delayed shifting when cold what's causing it

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

598 words

Problem Statement

Learn to diagnose and fix delayed shifting in Toyota Highlander (2014-2019). 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 to prevent burns.

Symptoms

•Delayed engagement when shifting from Park to Drive or Reverse
•Rough or jerky shifts when the transmission is cold
•Engine RPMs increase without corresponding acceleration
•Unusual noises during shifting (grinding or whining)
•Check engine light may be illuminated

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for transmission-related trouble codes.
2
Inspect the transmission fluid level and condition (color and smell).
3
Check for any visible leaks around the transmission pan and seals.
4
Test the transmission fluid temperature sensor for correct operation using a multimeter.
5
Evaluate the transmission control module (TCM) for faults or software updates.
6
Inspect the throttle position sensor (TPS) for proper operation and calibration.

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
•Fluid pump
•Torque wrench
•Multimeter
•Socket set

Parts Required

•Toyota ATF WS transmission fluid
•Transmission filter (if applicable)
•Transmission pan gasket
•Transmission fluid temperature sensor (if faulty)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for transmission-related trouble codes.
2
Inspect the transmission fluid level and condition (color and smell).
3
Check for any visible leaks around the transmission pan and seals.
4
Test the transmission fluid temperature sensor for correct operation using a multimeter.
5
Evaluate the transmission control module (TCM) for faults or software updates.
6
Inspect the throttle position sensor (TPS) for proper operation and calibration.

Solution

1. Preparation

Tools Required: OBD-II scanner, fluid pump, torque wrench, multimeter, socket set
Park the vehicle on a level surface and engage the parking brake.
Disconnect the battery to ensure electrical safety.

2. Inspect and Replace Transmission Fluid

Sub-steps:
1. Remove the transmission fluid dipstick and check fluid level and condition.
2. If fluid is low, locate the fill plug and use a fluid pump to add the appropriate type of Toyota ATF WS transmission fluid.
3. If fluid is dark or smells burnt, proceed to drain the transmission fluid.
4. Remove the transmission pan bolts using a socket set. Carefully lower the pan and allow the fluid to drain completely.
5. Replace the transmission filter if applicable; remove the old filter and install a new one.
6. Clean the transmission pan and replace the gasket before re-installing the pan.
7. Refill the transmission with new ATF WS fluid through the dipstick tube to the proper level.

3. Test Transmission Fluid Temperature Sensor

Sub-steps:
1. Locate the transmission fluid temperature sensor and disconnect the electrical connector.
2. Use a multimeter to test the resistance of the sensor at various temperatures (refer to manufacturer specifications).
3. If the sensor is faulty, replace it with a new one.

4. Check and Update Transmission Control Module (TCM)

Sub-steps:
1. Reconnect the battery and use the OBD-II scanner to check for firmware updates for the TCM.
2. If updates are available, follow the scanner instructions to update the TCM software.
3. Clear any existing fault codes and perform a test drive to assess shifting performance.