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Home/Cars/Toyota/Corolla/E170 (2013-2019)/how to fix P0300 code in Toyota Corolla E170 (2013-2019)?

how to fix P0300 code in Toyota Corolla E170 (2013-2019)?

Toyota Corolla E170 (2013-2019)

Severity: highDifficulty: mediumError Code: P03002-4 hours
3 min read
569 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 P0300 engine misfire in Toyota Corolla E170 (2013-2019). Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0300
Component
Engine
Repair Time
2-4 hours

Safety Warnings

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

Symptoms

  • •Check engine light illuminated
  • •Rough idle
  • •Loss of power during acceleration
  • •Decreased fuel efficiency
  • •Engine stalling intermittently

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to confirm P0300 and check for any additional codes.
  2. 2Inspect the ignition system components, including spark plugs, ignition coils, and wires, for wear or damage.
  3. 3Check fuel system pressure to ensure the fuel pump is functioning correctly.
  4. 4Inspect the air intake system for vacuum leaks or blockages.
  5. 5Examine the engine's mechanical condition, including compression tests on all cylinders.
  6. 6Review the vehicle's maintenance records for overdue service items, such as spark plug replacement.

Solution

Solution

1. Preparation

  • Gather tools and parts necessary for the repair.
  • Safety gear: gloves and safety glasses.
  • Disconnect the negative battery terminal to prevent electrical shocks.

2. Inspect and Replace Ignition Components

  1. Spark Plug Inspection

    • Remove the spark plugs using a socket wrench.
    • Inspect for wear, carbon buildup, or damage.
    • Replace spark plugs if they are worn or the gap is out of specification (0.043 inches for Toyota Corolla).
  2. Ignition Coil Inspection

    • Remove the ignition coils from each cylinder.
    • Check for cracks or signs of arcing.
    • Replace any faulty ignition coils.
  3. Ignition Wire Inspection

    • Inspect the ignition wires for fraying or corrosion.
    • Replace any damaged wires with OEM parts.

3. Fuel System Check

  1. Fuel Pressure Test
    • Connect a fuel pressure gauge to the fuel rail.
    • Turn the ignition to the "On" position without starting the engine to check the pressure (should be between 43-50 psi).
    • If pressure is low, check the fuel filter and fuel pump for issues.

4. Air Intake and Vacuum System Inspection

  1. Inspect for Vacuum Leaks
    • Visually inspect all vacuum hoses and intake manifold for cracks or disconnections.
    • Use a smoke machine or carburetor cleaner to locate leaks.
    • Replace any damaged hoses or seals.

5. Engine Mechanical Condition Check

  1. Compression Test
    • Remove all spark plugs.
    • Insert a compression gauge into each cylinder and crank the engine.
    • Compare readings; a healthy engine should have similar compression across all cylinders (around 180 psi).
    • Address any discrepancies by inspecting valves and piston rings.

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
  • Fuel pressure gauge
  • Smoke machine (optional)

Parts Required

  • Spark plugs
  • Ignition coils (if faulty)
  • Ignition wires (if damaged)
  • Fuel filter (if necessary)

Additional Information

Error CodeP0300
Component

Engine

Repair Time

2-4 hours

Difficulty

medium

Severity

high

Tools

6 items

Parts

4 items

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