my Toyota Highlander XU70 (2020-Present) won't start in cold weather what to do

Solution

1. Preparation

• Gather tools: socket set, multimeter, OBD-II scanner, jumper cables.
• Ensure the vehicle is in a safe location and the engine is off.

2. Battery Inspection and Replacement

• Check Battery Voltage: Use a multimeter to measure the battery voltage. If it's below 12.4 volts, charge or replace the battery.
• Clean Battery Terminals: Disconnect the battery negative terminal first, then the positive. Clean any corrosion with a mixture of baking soda and water, then reconnect.
• Replace Battery (if necessary): If the battery is unable to hold a charge, replace it with a new, compatible battery. Torque the terminals to manufacturer specifications.

3. Starter Motor Testing

• Bypass Starter Motor: Use jumper cables to connect the battery directly to the starter motor terminal. If the starter engages, it may need replacement.
• Replace Starter Motor (if necessary): Remove the starter motor by disconnecting its wiring and unbolting it from the engine. Install the new starter and reconnect wiring, ensuring bolts are torqued to specifications.

4. Fuel System Check

• Inspect Fuel Pump: Turn the ignition to the "ON" position without starting the engine and listen for the fuel pump priming sound.
• Replace Fuel Filter (if necessary): If the fuel pump is functioning but the engine does not start, replace the fuel filter according to manufacturer specifications.