my Toyota Highlander Third Generation (2014-2019) has trouble starting what could be wrong

Toyota Highlander Third Generation (2014-2019)

Error Codes

1-3 hours

Time

medium

Difficulty

high

Severity

4 min read

602 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 starting issues in the 2014-2019 Toyota Highlander. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before inspecting the fuel system.

Symptoms

•Engine cranks but does not start
•No sound when the ignition is turned
•Dashboard warning lights illuminated (e.g., battery light, check engine light)
•Weak or slow cranking of the engine
•Fuel odor near the engine compartment
•Battery drained or corroded terminals

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any recorded issues.
2
Check battery voltage with a multimeter; a healthy battery should read around 12.6 volts.
3
Inspect battery terminals and cables for corrosion or loose connections.
4
Test the starter motor by bypassing the ignition with a jump wire.
5
Check fuel pump operation by listening for the pump's activation sound when turning the ignition on.
6
Verify the fuel level in the tank to rule out an empty tank.

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

•OBD-II scanner
•Multimeter
•Socket set (10mm socket for battery)
•Wire brush
•Jump wire

Parts Required

•New battery (if needed)
•Fuel pump relay (if needed)
•Starter motor (if needed)
•Fuel filter (if needed)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any recorded issues.
2
Check battery voltage with a multimeter; a healthy battery should read around 12.6 volts.
3
Inspect battery terminals and cables for corrosion or loose connections.
4
Test the starter motor by bypassing the ignition with a jump wire.
5
Check fuel pump operation by listening for the pump's activation sound when turning the ignition on.
6
Verify the fuel level in the tank to rule out an empty tank.

Solution

1. Preparation

Gather tools and parts before starting the repair.
Ensure the vehicle is parked on a level surface and the engine is off.
Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Clean Battery Connections

Remove the battery terminals (negative first, then positive).
Clean corrosion on battery terminals and cable connectors using a wire brush and baking soda solution.
Reconnect the terminals securely, ensuring a tight fit.

3. Replace the Battery (if necessary)

If the battery voltage is below 12.4 volts or shows signs of failure:
1. Use a 10mm socket to remove the battery hold-down bracket.
2. Carefully lift out the old battery.
3. Place the new battery in the tray, ensuring proper orientation.
4. Reattach the hold-down bracket and secure it.
5. Connect the positive terminal first, followed by the negative.

4. Test the Starter Motor

If the battery is functional but the engine still does not start:
1. Locate the starter motor (typically near the transmission).
2. Use a multimeter to check for voltage at the starter terminal while someone tries to start the car.
3. If no voltage is present, check the ignition switch and wiring.
4. If voltage is present, replace the starter motor.

5. Check Fuel System

If the starter is operational but the engine won’t start:
1. Locate the fuel pump relay and check its operation.
2. If faulty, replace the relay and test the fuel pump.
3. Consider replacing the fuel filter if it has not been changed in a while.