how to fix hard starting issue in Toyota Highlander XU70 (2020-Present)

Solution

1. Preparation

• Gather tools and materials required for repair.
• Ensure the vehicle is parked on a level surface and the engine is turned off.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Battery

• Sub-steps:
  1. Remove the battery cover if applicable.
  2. Clean battery terminals with a wire brush.
  3. Check battery voltage with a multimeter; replace if below 12.4V.
  4. Reconnect the battery terminals securely.

3. Fuel System Inspection

• Sub-steps:
  1. Locate the fuel pump fuse and relay, inspect for faults, replace if necessary.
  2. Connect a fuel pressure gauge to the fuel rail.
  3. Turn the ignition to the "ON" position (do not start) and check the fuel pressure; it should be within manufacturer specifications (approx. 50-60 psi).
  4. If pressure is low, inspect the fuel filter and replace if clogged; if necessary, replace the fuel pump.

4. Ignition System Inspection

• Sub-steps:
  1. Remove the ignition coil cover.
  2. Check the condition of the spark plugs; replace if worn or fouled.
  3. Test ignition coils for proper resistance using a multimeter (consult specifications).
  4. Replace any faulty coils and ensure all connections are secure.

5. Air Intake Inspection

• Sub-steps:
  1. Remove the air intake duct and inspect the air filter; replace if dirty or clogged.
  2. Ensure the throttle body is clean; use throttle body cleaner if necessary.
  3. Reinstall the intake components securely.