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

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

Toyota Highlander Fourth Generation (2020-present)

Error Codes
1-2 hours
Time
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
4 min read
759 words

Problem Statement

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

Affected Component
ignition coil
Estimated Time
1-2 hours

Symptoms

  • •Engine Misfires
  • •Poor Fuel Economy
  • •Check Engine Light (CEL)
  • •Rough Idle
  • •Decreased Acceleration
  • •Backfiring or Stalling

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
  • •Spark tester
  • •Basic hand tools (screwdrivers, ratchet set, etc.)
  • •Safety glasses
  • •Gloves

Additional Information

Affected Component
ignition coil
Estimated Time
1-2 hours
Difficulty
medium
Severity
medium
Tools Required
6 items

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Signs of a Failing Ignition Coil in the 2022 Toyota Highlander

The ignition coil is a critical component of the ignition system that converts battery voltage into the high voltage needed to ignite the air-fuel mixture in the engine cylinders. A failing ignition coil can lead to various performance issues. Below are the common symptoms you may experience in a 2022 Toyota Highlander if an ignition coil is failing:

Tools Required

  • OBD-II scanner
  • Multimeter
  • Spark tester
  • Basic hand tools (screwdrivers, ratchet set, etc.)
  • Safety glasses
  • Gloves
Repair Instructions

If you confirm that an ignition coil is faulty, follow these steps for replacement:

Step 1: Preparation

  • Safety First: Ensure the vehicle is parked on a level surface. Engage the parking brake and disconnect the negative battery terminal to prevent electrical shock.

Step 2: Access the Ignition Coil

  • Remove Engine Cover (if applicable): Using a ratchet and socket, remove any screws or bolts securing the engine cover.
  • Locate the Ignition Coils: Identify the ignition coils, typically located on top of the engine, directly above the spark plugs.

Step 3: Remove the Ignition Coil

  1. Disconnect the Electrical Connector: Carefully disengage the wiring harness connector from the ignition coil by pressing the release tab.
  2. Remove Mounting Bolts: Use a ratchet and socket to remove the bolts securing the ignition coil in place.
  3. Pull Out the Ignition Coil: Gently pull the ignition coil straight out of the spark plug well.

Step 4: Install the New Ignition Coil

  1. Prepare the New Coil: Apply a small amount of dielectric grease to the rubber boot of the new ignition coil to ensure a good seal and prevent moisture ingress.
  2. Insert the New Coil: Carefully insert the new ignition coil into the spark plug well.
  3. Secure the Coil: Replace the mounting bolts and tighten them to the specified torque (consult the service manual for exact specs).
  4. Reconnect the Electrical Connector: Plug the wiring harness back into the ignition coil until it clicks securely.

Step 5: Reassemble and Test

  • Reinstall Engine Cover: If removed, replace the engine cover and secure it with the screws or bolts.
  • Reconnect the Battery: Reattach the negative battery terminal.
  • Start the Engine: Turn the ignition key to start the engine. Check for smooth operation and ensure that the check engine light is off.
Conclusion

If the symptoms persist after replacing the ignition coil, further diagnostics may be required to check for other underlying issues, such as faulty spark plugs or fuel system problems. Regular maintenance and prompt attention to engine warning signs can help ensure the longevity and performance of your Toyota Highlander.