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What are the symptoms of a failing ignition coil in a 2022 Toyota Highlander? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/What are the symptoms of a failing ignition coil in a 2022 Toyota Highlander?

What are the symptoms of a failing ignition coil in a 2022 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
2-3 hours
Time
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
4 min read
666 words

Problem Statement

Learn about the symptoms of a failing ignition coil in the 2022 Toyota Highlander, diagnostic steps, tools required, and repair instructions.

Affected Component
ignition coil
Estimated Time
2-3 hours

Symptoms

  • •Engine Misfire
  • •Check Engine Light
  • •Rough Idle
  • •Poor Fuel Economy
  • •Difficulty Starting
  • •Unusual Engine Noise

Diagnostic Steps

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

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
  • •Multimeter
  • •Torque wrench
  • •Ratchet and socket set
  • •Screwdrivers (flat and Phillips)
  • •Pliers
  • •Clean cloth for wiping connectors
  • •Safety glasses and gloves for protection

Additional Information

Affected Component
ignition coil
Estimated Time
2-3 hours
Difficulty
medium
Severity
medium
Tools Required
8 items

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Back to Generation
Tools Required
  • OBD-II Scanner
  • Multimeter
  • Torque wrench
  • Ratchet and socket set
  • Screwdrivers (flat and Phillips)
  • Pliers
  • Clean cloth for wiping connectors
  • Safety glasses and gloves for protection
Repair Instructions

Step 1: Safety Precautions

  • Ensure the vehicle is turned off and the keys are removed from the ignition.
  • Disconnect the battery by removing the negative terminal to prevent any electrical shorts.

Step 2: Access the Ignition Coils

  • Open the hood and locate the engine cover (if applicable).
  • Remove any bolts or clips securing the engine cover using the ratchet and socket.
  • Carefully lift off the engine cover to expose the ignition coils.

Step 3: Remove the Ignition Coil

  • Identify the faulty ignition coil based on the diagnostic steps or trouble codes.
  • Disconnect the electrical connector from the ignition coil by pressing the release tab and pulling it off gently.
  • Remove the bolt securing the ignition coil using the ratchet and socket.
  • Carefully pull the ignition coil straight out of the spark plug well.

Step 4: Install the New Ignition Coil

  • Apply a small amount of dielectric grease to the rubber boot of the new ignition coil.
  • Insert the new ignition coil into the spark plug well, ensuring it is seated properly.
  • Reinstall the securing bolt and tighten to the manufacturer’s specified torque (refer to the service manual).
  • Reconnect the electrical connector until it clicks into place.

Step 5: Reassemble and Test

  • Replace the engine cover and secure it with the appropriate bolts or clips.
  • Reconnect the battery by attaching the negative terminal.
  • Start the engine and check for any warning lights.

Step 6: Test Drive

  • Take the vehicle for a test drive to ensure that the symptoms have been resolved.
  • Monitor engine performance and check for any reoccurring trouble codes.
Conclusion

If you have replaced the ignition coil and the symptoms persist, further diagnosis may be required, including checking the spark plugs, ignition wiring, or the Engine Control Module (ECM). If you are uncomfortable performing these tasks, it is advisable to consult a professional mechanic.