how to diagnose starting problems on Toyota Highlander Third Generation (2014-2019)

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

553 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 problems in Toyota Highlander (2014-2019). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on the electrical systems.
•Allow engine to cool before inspecting the starter motor.

Symptoms

•Engine cranks slowly or not at all
•Clicking sound when turning the key
•Dashboard lights and accessories function but engine does not start
•Check engine light illuminated
•Battery warning light appears
•Unusual smells (burning or sulfuric)

Diagnostic Steps

1
Check the battery voltage using a multimeter; should be above 12.4 volts.
2
Inspect battery terminals for corrosion and ensure they are tightly connected.
3
Test the starter motor by applying direct power to it; listen for engagement.
4
Scan the vehicle's OBD-II system for error codes related to the ignition or starting system.
5
Verify the integrity of the ignition switch by checking voltage output during the 'start' position.
6
Inspect the fuses related to the starting system for any blown fuses.

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

•Multimeter
•Socket set
•Wire brush
•Battery tester
•Screwdrivers

Parts Required

•New battery (if needed)
•New starter motor (if needed)
•New ignition switch (if needed)

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Diagnostic Steps

1
Check the battery voltage using a multimeter; should be above 12.4 volts.
2
Inspect battery terminals for corrosion and ensure they are tightly connected.
3
Test the starter motor by applying direct power to it; listen for engagement.
4
Scan the vehicle's OBD-II system for error codes related to the ignition or starting system.
5
Verify the integrity of the ignition switch by checking voltage output during the 'start' position.
6
Inspect the fuses related to the starting system for any blown fuses.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the negative battery terminal to ensure safety during the repair.

2. Battery Inspection and Replacement

Inspect the Battery:
- Clean any corrosion from the terminals using a wire brush.
- Check for physical damage or swelling.
Test Battery Condition:
- Use a battery tester to check for load capacity.
- If the battery is faulty, proceed to replace it.
Replace Battery:
- Remove the old battery and replace it with a new one of the same specifications.
- Reconnect terminals: first positive, then negative.

3. Starter Motor Inspection and Replacement

Access the Starter Motor:
- Raise the vehicle securely using jack stands.
- Remove the undercarriage cover if necessary.
Remove Starter Motor:
- Disconnect electrical connections from the starter.
- Unbolt the starter motor using a socket set (typically 10mm or 12mm bolts).
Install New Starter Motor:
- Position the new starter in place and secure it with bolts.
- Reconnect electrical connections ensuring they are tight.

4. Ignition Switch Testing and Replacement

Remove Ignition Switch:
- Disconnect the steering column cover.
- Remove screws and clips to access the ignition switch.
Test Ignition Switch:
- Use a multimeter to check for continuity in the start position.
Replace Ignition Switch (if faulty):
- Install the new ignition switch and secure it back in place.
- Reassemble the steering column cover.