my Toyota RAV4 XA50 (2019-2024) has a hard start in the morning what's wrong

Solution

1. Preparation

• Gather tools and parts needed for repairs.
• Ensure the vehicle is on a flat surface and the parking brake is engaged.
• Disconnect the negative battery terminal to ensure safety.

2. Battery Inspection and Replacement (if necessary)

• Sub-steps:
  1. Remove the battery terminal connections (negative first, then positive).
  2. Use a multimeter to check the battery voltage; it should be above 12.4 volts.
  3. Clean the battery terminals with a wire brush if corrosion is present.
  4. If the battery is weak (below 12.4 volts), replace it with a new one and reconnect the terminals (positive first, then negative).

3. Fuel System Inspection and Repair

• Sub-steps:
  1. Locate the fuel pressure test port on the fuel rail.
  2. Connect a fuel pressure gauge to the test port.
  3. Turn the ignition to the "ON" position without starting the engine and check the pressure; it should be within specifications (usually around 50-60 psi).
  4. If pressure is low, inspect the fuel pump, fuel filter, and fuel lines for blockages and wear.
  5. Replace the fuel filter if it appears clogged or if the fuel pump is faulty, replace it as needed.

4. Ignition System Inspection

• Sub-steps:
  1. Remove the spark plug wires and inspect the spark plugs for wear or oil fouling.
  2. Replace spark plugs if they show signs of wear (gap should be checked and adjusted to manufacturer's specifications).
  3. Test the ignition coils with a multimeter to ensure they are generating the correct voltage.
  4. Replace any faulty ignition components.