what are the symptoms of a bad ignition coil in a Toyota Corolla E170 (2013-2019)

Toyota Corolla E170 (2013-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

476 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Discover symptoms of a bad ignition coil in a 2013-2019 Toyota Corolla E170. Follow our diagnostic steps and repair guide for effective solutions.

Affected Component

Engine

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before starting work to avoid burns.

Symptoms

•Check engine light illuminated
•Engine misfires or rough idling
•Difficulty starting the engine
•Decreased fuel efficiency
•Loss of power during acceleration
•Engine stalling or hesitation

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify misfire codes.
2
Inspect the ignition coil visually for cracks or signs of damage.
3
Check the spark plugs for wear or fouling.
4
Measure the resistance of the ignition coil using a multimeter to ensure it is within specifications.
5
Test the ignition coil with a coil tester to confirm functionality.
6
Inspect wiring and connectors associated with the ignition coil for corrosion or damage.

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
•Multimeter
•Torque wrench

Parts Required

•Ignition coil(s)
•Spark plugs (if needed)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify misfire codes.
2
Inspect the ignition coil visually for cracks or signs of damage.
3
Check the spark plugs for wear or fouling.
4
Measure the resistance of the ignition coil using a multimeter to ensure it is within specifications.
5
Test the ignition coil with a coil tester to confirm functionality.
6
Inspect wiring and connectors associated with the ignition coil for corrosion or damage.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the negative battery terminal to prevent electrical shock.

2. Remove Ignition Coil

Locate the ignition coil(s) on the engine (typically on top of the engine cover).
Remove any engine cover if necessary (use socket set).
Disconnect the electrical connector from the ignition coil by pressing the tab and pulling it off.
Remove the mounting bolts (if applicable) using a socket wrench.
Gently pull the ignition coil straight out of the spark plug well.

3. Inspect and Replace

Inspect the old ignition coil for any visible damage.
Check spark plugs for wear; replace if necessary.
Ensure the spark plug well is clean and free of debris.
Install the new ignition coil by aligning it with the spark plug and pushing it down until it is seated.
Reinstall any mounting bolts and tighten to manufacturer specifications (usually around 7-10 ft-lbs).

4. Reconnect Electrical Components

Reconnect the electrical connector to the new ignition coil.
Replace the engine cover if it was removed.

5. Final Steps

Reconnect the negative battery terminal.
Start the engine and check for any abnormal sounds or issues.