how to diagnose a failed ignition coil in my Toyota Highlander XU70 (2020-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a flat surface and engage the parking brake.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Remove Ignition Coil

• Remove the engine cover if necessary using a socket set.
• Disconnect the electrical connector from the ignition coil by pressing the release tab and pulling it off.
• Remove the bolt securing the ignition coil using a socket wrench.
• Gently pull the ignition coil out of the spark plug well.

3. Inspect and Replace

• Inspect the ignition coil for cracks or damage. If damaged, proceed with replacement.
• Install the new ignition coil by aligning it with the spark plug hole and pushing it into place.
• Secure the ignition coil with the bolt and tighten it to the manufacturer’s specified torque (typically around 7-10 ft-lbs).
• Reconnect the electrical connector until it clicks into place.

4. Reassemble and Test

• Reinstall the engine cover if it was removed.
• Reconnect the negative battery terminal.
• Start the engine and allow it to reach operating temperature.