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What causes the car to jerk during acceleration in a 2020 Toyota Highlander? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/What causes the car to jerk during acceleration in a 2020 Toyota Highlander?

What causes the car to jerk during acceleration in a 2020 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
3-5 hours
Time
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
4 min read
719 words

Problem Statement

Learn about the causes, symptoms, and diagnostic steps for jerking during acceleration in a 2020 Toyota Highlander. Find repair instructions and tools required.

Affected Component
Fuel system, Ignition system, Transmission, Sensors
Estimated Time
3-5 hours

Symptoms

  • •Noticeable Jerkiness
  • •Engine RPM Fluctuation
  • •Unstable Acceleration
  • •Check Engine Light

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6
  7. 7

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
  • •Basic hand tools
  • •OBD-II scanner
  • •Fuel pressure gauge
  • •Multimeter
  • •Spark plug socket
  • •Ignition coil tester
  • •Transmission fluid dipstick
  • •Funnel
  • •Vacuum gauge
  • •Smoke machine

Additional Information

Affected Component
Fuel system, Ignition system, Transmission, Sensors
Estimated Time
3-5 hours
Difficulty
medium
Severity
medium
Tools Required
11 items

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Back to Generation
Possible Causes
  1. Fuel Delivery Issues: Clogged fuel filter or failing fuel pump.
  2. Ignition System Problems: Worn spark plugs, faulty ignition coils, or issues with the ignition timing.
  3. Transmission Issues: Low transmission fluid, slipping transmission, or faulty torque converter.
  4. Sensor Malfunctions: Issues with the Mass Air Flow (MAF) sensor, Throttle Position Sensor (TPS), or Oxygen sensors.
  5. Vacuum Leaks: Leaks in the intake system causing an improper air-fuel mixture.
  6. Engine Misfire: Caused by any of the above issues or others like a faulty fuel injector.

Step 1: Visual Inspection

  • Tools Required: Flashlight, basic hand tools.
  • Action: Inspect the engine bay for any loose or damaged hoses, especially vacuum lines. Check the condition of spark plug wires and connectors.

Step 2: Check for Diagnostic Trouble Codes (DTCs)

  • Tools Required: OBD-II scanner.
  • Action: Connect the OBD-II scanner to the vehicle's diagnostic port and check for any stored trouble codes. Note down the codes for further analysis.

Step 3: Fuel System Check

  • Tools Required: Fuel pressure gauge, multimeter.
  • Action:
    • Use a fuel pressure gauge to check the fuel pressure. Compare readings with the manufacturer specifications.
    • Inspect the fuel filter for clogs and the fuel pump for proper operation.

Step 4: Ignition System Check

  • Tools Required: Spark plug socket, ignition coil tester, multimeter.
  • Action:
    • Remove and inspect spark plugs for wear or fouling.
    • Test the resistance of ignition coils to ensure they are within specification.

Step 5: Transmission Fluid Check

  • Tools Required: Transmission fluid dipstick (if available), funnel.
  • Action: Check the transmission fluid level and condition. If low or burnt, it may need to be replaced.

Step 6: Sensor Testing

  • Tools Required: Multimeter, scan tool.
  • Action:
    • Test the MAF and TPS for proper voltage output. Compare with specifications in the service manual.
    • Inspect the Oxygen sensors for proper operation.

Step 7: Vacuum Leak Test

  • Tools Required: Vacuum gauge or smoke machine.
  • Action: Use a vacuum gauge to check for leaks. Alternatively, a smoke machine can help identify leaks in the intake system.
Repair Instructions

Repairing Fuel Delivery Issues

  1. Replace Clogged Fuel Filter:

    • Locate the fuel filter under the vehicle or engine bay.
    • Use appropriate tools to disconnect fuel lines (be cautious of fuel spillage).
    • Replace the filter with a new one and reconnect lines securely.

  2. Replace Fuel Pump (if needed):

    • Access the fuel pump by removing the rear seat or accessing the fuel tank.
    • Disconnect wiring and fuel lines.
    • Replace the pump and reassemble.

Ignition System Repairs

  1. Replace Spark Plugs:

    • Remove old spark plugs using a spark plug socket.
    • Install new spark plugs with the correct gap as per specifications.

  2. Replace Ignition Coils (if needed):

    • Disconnect the battery.
    • Remove the ignition coils and replace with new ones.

Transmission Fluid Change

  1. Drain Old Transmission Fluid:

    • Raise the vehicle safely and secure it on jack stands.
    • Remove the transmission fluid pan and drain the fluid.

  2. Replace Transmission Filter:

    • Remove the old filter, clean the pan, and install a new filter.

  3. Refill New Fluid:

    • Reinstall the pan and fill with the manufacturer-recommended transmission fluid.

Sensor Replacement

  1. Replace Faulty MAF or TPS:
    • Disconnect the battery.
    • Remove the faulty sensor and install the new one, ensuring all connections are secure.

Fixing Vacuum Leaks

  1. Repair or Replace Leaky Hoses:
    • Identify the source of the leak and replace any damaged hoses.
Conclusion

After completing repairs, clear any DTCs and take the vehicle for a test drive to confirm that the jerking during acceleration has been resolved. If issues persist, further diagnostic steps may be necessary, potentially involving deeper inspection of the transmission or engine internals.