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Home/Cars/Toyota/Corolla/E140 (2006-2013)/how to troubleshoot P0302 code on Toyota Corolla E140 (2006-2013)

how to troubleshoot P0302 code on Toyota Corolla E140 (2006-2013)

Toyota Corolla E140 (2006-2013)

Severity: highDifficulty: mediumError Code: P03022-4 hours
4 min read
624 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 diagnose and fix P0302 cylinder 2 misfire in Toyota Corolla. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0302
Component
Engine
Repair Time
2-4 hours

Safety Warnings

  • ⚠Disconnect the battery before working on the electrical system.
  • ⚠Allow the engine to cool before opening the hood to prevent burns.

Symptoms

  • •Check engine light illuminated
  • •Rough idle
  • •Decreased acceleration
  • •Poor fuel economy
  • •Engine stalling or hesitation during acceleration

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to confirm P0302 and check for additional codes.
  2. 2Inspect the ignition system, including spark plugs, ignition coils, and wires for signs of wear or damage.
  3. 3Perform a visual inspection of the fuel injectors, especially the one for cylinder 2, for leaks or clogs.
  4. 4Test cylinder compression using a compression gauge to check for mechanical issues.
  5. 5Check for vacuum leaks around the intake manifold and associated hoses.
  6. 6Monitor the fuel pressure with a fuel pressure gauge to ensure it meets specifications.

Solution

Solution

1. Preparation

  • Gather tools and parts needed for the repair.
  • Disconnect the negative battery terminal to ensure safety.
  • Allow the engine to cool before beginning work.

2. Inspect and Replace Spark Plug

  • Remove the spark plug from cylinder 2 using a socket wrench.
  • Inspect the spark plug for wear, carbon deposits, or damage. Replace if necessary.
  • Install a new spark plug, ensuring it is gapped correctly according to manufacturer specifications (typically around 0.044 inches for a Corolla).
  • Torque the spark plug to the manufacturer’s specified value (usually around 13 lb-ft).

3. Inspect and Replace Ignition Coil

  • Remove the ignition coil from cylinder 2 by unbolting it (if applicable) and disconnecting the electrical connector.
  • Test the ignition coil with a multimeter for resistance; replace if it is out of specification.
  • Install a new ignition coil, ensuring it is seated properly and reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

  • Disconnect the fuel injector connector for cylinder 2.
  • Remove the fuel injector from its rail, being cautious of fuel spillage.
  • Clean the fuel injector using a specialized fuel injector cleaner or replace it if it is clogged or damaged.
  • Reinstall the injector, ensuring it is seated correctly and reconnect the electrical connector.

5. Perform Compression Test

  • If misfire persists, perform a compression test on cylinder 2.
  • Insert the compression gauge into the spark plug hole and crank the engine to get a reading.
  • Compare the compression values to the manufacturer’s specifications (typically around 180 psi for a healthy engine). If the compression is low, further diagnosis is needed for potential issues like valve problems or head gasket failure.

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
  • Torque wrench
  • Compression gauge
  • Multimeter
  • Fuel pressure gauge
  • Fuel injector cleaner or replacement injectors

Parts Required

  • Spark plug for cylinder 2
  • Ignition coil for cylinder 2
  • Fuel injector for cylinder 2 (if needed)

Additional Information

Error CodeP0302
Component

Engine

Repair Time

2-4 hours

Difficulty

medium

Severity

high

Tools

7 items

Parts

3 items

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