how to test the ignition coils on my Toyota Corolla E170 (2013-2019)?

Toyota Corolla E170 (2013-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

525 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

Learn how to test ignition coils on a 2013-2019 Toyota Corolla E170. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Engine

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on the ignition system to avoid electrical shock

Symptoms

•Engine misfires or rough idling
•Check engine light illuminated
•Poor fuel economy
•Difficulty starting the engine
•Increased emissions

Diagnostic Steps

1
Scan for error codes using OBD-II scanner
2
Inspect the ignition coils for any visible damage, cracks, or corrosion on the terminals
3
Measure the resistance of the ignition coils with a multimeter
4
Remove one ignition coil at a time and use a spark tester to see if a spark is produced when cranking the engine
5
Check for proper voltage supply and ground at the ignition coil connectors using a multimeter

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
•Socket set
•Spark tester
•Safety gloves

Parts Required

•Replacement ignition coils (if any are found faulty)
•New spark plugs (if required)

Related Faults

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Diagnostic Steps

1
Scan for error codes using OBD-II scanner
2
Inspect the ignition coils for any visible damage, cracks, or corrosion on the terminals
3
Measure the resistance of the ignition coils with a multimeter
4
Remove one ignition coil at a time and use a spark tester to see if a spark is produced when cranking the engine
5
Check for proper voltage supply and ground at the ignition coil connectors using a multimeter

Solution

1. Preparation

Tools Required: OBD-II scanner, multimeter, socket set, spark tester, safety gloves.
Disconnect the negative terminal of the battery to prevent electrical shock.

2. Remove Ignition Coils

Sub-steps:
1. Locate the ignition coils on the engine (typically found on top of the engine).
2. Remove the engine cover if necessary (using a socket set).
3. Disconnect the electrical connector from the ignition coil by pressing the tab and pulling it out.
4. Remove the mounting bolts securing the ignition coil using the socket set.
5. Carefully pull the ignition coil out of the spark plug well.

3. Test Ignition Coil Resistance

Sub-steps:
1. Set the multimeter to the resistance (ohms) setting.
2. Connect the multimeter probes to the ignition coil terminals (consult the service manual for specific resistance values).
3. Compare the readings with the specified resistance range. If the readings are outside the range, the coil is faulty.

4. Perform Spark Test

Sub-steps:
1. Install the spark tester onto the ignition coil's connector.
2. Reconnect the battery negative terminal.
3. Crank the engine while observing the spark tester. A strong and consistent spark indicates a functioning ignition coil.

5. Reinstall Ignition Coils

Sub-steps:
1. Reinsert the tested ignition coil back into the spark plug well.
2. Secure it with the mounting bolts and reconnect the electrical connector.
3. Repeat for each ignition coil as required.
4. Reattach the engine cover if it was removed.