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What are the common issues with the Highlander’s engine timing chain? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/What are the common issues with the Highlander’s engine timing chain?

What are the common issues with the Highlander’s engine timing chain?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
4 min read
739 words

Problem Statement

Explore common symptoms, diagnostic steps, and repair solutions for timing chain issues in the Toyota Highlander Fourth Generation (2020-present).

Affected Component
engine timing chain

Symptoms

  • •Rattling Noise from Engine
  • •Check Engine Light
  • •Engine Misfires
  • •Poor Acceleration
  • •Engine Overheating

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6

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 (including 10mm, 12mm, 14mm, and 17mm sockets)
  • •Torque wrench
  • •Timing chain tensioner tool (if applicable)
  • •Engine oil (for reassembly)
  • •Screwdrivers (flathead and Phillips)
  • •Pliers
  • •Engine hoist (if engine needs to be lifted)

Additional Information

Affected Component
engine timing chain
Difficulty
medium
Severity
medium
Tools Required
8 items

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Common Issues with the Toyota Highlander Fourth Generation Engine Timing Chain

The Toyota Highlander (2020-present, XU70) is equipped with a timing chain rather than a timing belt. While timing chains are generally more durable than belts, they can still experience issues. Below are some common symptoms, diagnostic steps, and potential repair solutions for timing chain problems in the Highlander.

Common Symptoms of Timing Chain Issues

  1. Rattling Noise from Engine: A loose timing chain can produce a rattling or slapping noise, especially during cold starts.
  2. Check Engine Light: The vehicle's onboard diagnostics may trigger the check engine light due to timing chain-related fault codes.
  3. Engine Misfires: If the timing chain has stretched or skipped a tooth, it can lead to improper timing affecting engine performance.
  4. Poor Acceleration: If the timing is off, the engine may hesitate or have reduced power during acceleration.
  5. Engine Overheating: A failing timing chain may cause the engine to run poorly, leading to overheating.

Tools Required

  • OBD-II Scanner
  • Socket set (including 10mm, 12mm, 14mm, and 17mm sockets)
  • Torque wrench
  • Timing chain tensioner tool (if applicable)
  • Engine oil (for reassembly)
  • Screwdrivers (flathead and Phillips)
  • Pliers
  • Engine hoist (if engine needs to be lifted)

Step-by-Step Diagnosis

  1. Visual Inspection:

    • Check for any obvious signs of oil leaks around the timing chain cover.
    • Inspect the engine for loose components or any signs of wear.

  2. Scan for Codes:

    • Connect an OBD-II scanner to the vehicle's diagnostic port.
    • Check for any fault codes related to the engine timing (e.g., P0016 or P0017).

  3. Listen for Noises:

    • Start the engine and listen for any abnormal rattling noises.
    • Pay attention to noises during cold starts as these may indicate chain slack.

  4. Check Engine Performance:

    • Test drive the vehicle to assess for misfires, hesitation, or poor acceleration.

  5. Inspect Timing Chain Tensioner:

    • If noise is present, access the timing chain tensioner (may require removing the engine cover).
    • Check the tensioner for proper operation and signs of wear.

  6. Chain Stretch Test:

    • If the timing chain covers are accessible, measure the distance between the links to check for elongation.
    • If the chain has stretched significantly, it may need replacement.
Repair Instructions

Tools Required for Repair

  • Same as diagnostic tools, plus:
  • Replacement timing chain
  • Timing chain guides and tensioner (if needed)
  • Gasket set for timing cover
  • Engine oil (for reassembly)

Step-by-Step Repair Process

  1. Preparation:

    • Disconnect the negative battery terminal.
    • Remove any engine covers and components obstructing access to the timing chain (e.g., air intake, serpentine belt).

  2. Drain Engine Oil:

    • Remove the oil drain plug and drain the oil into a suitable container.

  3. Remove Timing Chain Cover:

    • Unfasten the bolts securing the timing chain cover using the appropriate socket.
    • Carefully pry off the cover, ensuring not to damage any gaskets.

  4. Inspect and Replace Timing Chain:

    • If your inspection has determined that the timing chain is stretched or damaged, remove the old chain and tensioner.
    • Install the new timing chain, ensuring it is aligned correctly with the timing marks on the camshaft and crankshaft.

  5. Install New Tensioner:

    • Replace the timing chain tensioner if it shows signs of wear.
    • Ensure that the tensioner is properly seated.

  6. Reassemble Timing Chain Cover:

    • Clean the mating surfaces of the timing cover and engine block.
    • Apply a new gasket or sealant as recommended by the manufacturer.
    • Reinstall the timing chain cover and torque the bolts to the manufacturer's specifications.

  7. Refill Engine Oil:

    • Replace the oil drain plug and refill the engine with new oil.

  8. Reconnect Battery and Start Engine:

    • Reconnect the negative battery terminal.
    • Start the engine and listen for abnormal noises. Monitor for leaks and check that the check engine light is off.

  9. Test Drive:

    • Conduct a test drive to ensure the engine operates smoothly without any symptoms present.
Conclusion

Timing chain issues on the Toyota Highlander Fourth Generation can lead to significant engine performance problems if not diagnosed and repaired promptly. Regular maintenance and early diagnosis of symptoms can help prevent major repairs. Always refer to the vehicle’s service manual for specific torque specifications and procedures relevant to your model.