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What are the symptoms of a failing ignition coil in a 2018 Toyota Camry? - Toyota Camry
Home/Cars/Toyota/Camry/Eighth Generation (2018-present)/What are the symptoms of a failing ignition coil in a 2018 Toyota Camry?

What are the symptoms of a failing ignition coil in a 2018 Toyota Camry?

Toyota Camry Eighth Generation (2018-present)

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

Problem Statement

Learn about the symptoms of a failing ignition coil in a 2018 Toyota Camry, diagnostic steps, and repair instructions.

Affected Component
ignition coil
Estimated Time
2-3 hours

Symptoms

  • •Engine Misfire
  • •Reduced Engine Performance
  • •Check Engine Light (CEL)
  • •Rough Idle
  • •Hard Starting or No Start
  • •Backfiring

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

  • •Flashlight
  • •OBD-II Scanner
  • •Spark tester
  • •Multimeter
  • •Ratchet and socket set
  • •Torque wrench
  • •Screwdriver set

Additional Information

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

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Back to Generation

Step 1: Visual Inspection

  • Tools Required: Flashlight
  • Inspect the ignition coils for any visible signs of damage (cracks, corrosion, etc.).
  • Check the wiring harness and connectors for loose connections or damage.

Step 2: Scan for Trouble Codes

  • Tools Required: OBD-II Scanner
  • Connect the scanner to the OBD-II port and retrieve any stored trouble codes.
  • Look for codes related to misfires (P0300-P0306) or ignition system issues.

Step 3: Perform a Spark Test

  • Tools Required: Spark tester, multimeter
  1. Disconnect the ignition coil connector.
  2. Remove the ignition coil from the spark plug.
  3. Attach the spark tester to the ignition coil terminal and ground it.
  4. Crank the engine and observe if a spark is produced.

Step 4: Measure Coil Resistance

  • Tools Required: Multimeter
  1. Disconnect the ignition coil from the harness.
  2. Measure the primary and secondary resistance according to the specifications in the service manual.
  3. Primary resistance: typically between 0.4 to 2.0 ohms (check service manual for exact specs).
  4. Secondary resistance: typically between 6,000 to 15,000 ohms (check service manual for exact specs).
  5. Compare readings to the specifications; replace if out of range.

Step 5: Swap Test

  • Tools Required: None
  1. If multiple ignition coils are present, swap the suspect coil with a known good coil.
  2. Clear the trouble codes and run the engine.
  3. If the misfire follows the coil, it confirms that the original coil is faulty.
Repair Instructions

Required Tools

  • Ratchet and socket set
  • Torque wrench
  • Screwdriver set
  • Multimeter
  • OBD-II scanner
  • Replacement ignition coil(s)

Step 1: Gather Replacement Parts

  • Obtain the correct ignition coil(s) for your specific engine configuration.

Step 2: Remove the Ignition Coil

  1. Safety First: Disconnect the negative battery terminal to prevent electrical shorts.
  2. Remove any engine covers or components obstructing access to the ignition coils.
  3. Disconnect the electrical connector from the ignition coil.
  4. Remove the mounting bolts securing the ignition coil to the engine.
  5. Carefully pull the ignition coil out of the spark plug hole.

Step 3: Install the New Ignition Coil

  1. Apply a small amount of dielectric grease to the inside of the new ignition coil’s boot (optional but recommended for better sealing).
  2. Insert the new ignition coil into the spark plug hole, ensuring it is seated properly.
  3. Secure the ignition coil with the mounting bolts and torque them to the specified value.
  4. Reconnect the electrical connector to the ignition coil.

Step 4: Reassemble and Test

  1. Reinstall any components or covers that were removed.
  2. Reconnect the negative battery terminal.
  3. Start the engine and monitor for any abnormal symptoms or warning lights.
  4. Use the OBD-II scanner to ensure no trouble codes are present.
Conclusion

By following these diagnostic and repair steps, you can effectively address issues related to a failing ignition coil in a 2018 Toyota Camry. Always refer to the vehicle’s service manual for specific torque values and specifications.