how to diagnose a Toyota Highlander Third Generation (2014-2019) that won't start in cold weather

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

552 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 a no-start condition in cold weather for Toyota Highlander 2014-2019. Step-by-step guide with diagnostic procedures 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 electrical systems.
•Ensure the engine is cool before accessing components.

Symptoms

•Engine cranks but does not start
•Weak or slow cranking of the engine
•Dashboard lights dimming when attempting to start
•Clicking noise from the starter when the key is turned
•Check engine light may be illuminated
•Fuel pump not engaging

Diagnostic Steps

1
Check the battery voltage using a multimeter; ensure it is above 12.4 volts.
2
Inspect battery terminals and connections for corrosion or looseness.
3
Test the starter motor by bypassing the ignition switch.
4
Verify fuel pump operation by listening for it to activate when the ignition is turned on.
5
Scan the vehicle for OBD-II trouble codes to identify any related issues.
6
Inspect the fuses related to the ignition and fuel systems for continuity.

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
•Battery terminal cleaner
•Jumper cables

Parts Required

•Battery (if necessary)
•Starter motor (if necessary)
•Fuel pump (if necessary)
•Fuses and relays (if necessary)

Related Faults

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Diagnostic Steps

1
Check the battery voltage using a multimeter; ensure it is above 12.4 volts.
2
Inspect battery terminals and connections for corrosion or looseness.
3
Test the starter motor by bypassing the ignition switch.
4
Verify fuel pump operation by listening for it to activate when the ignition is turned on.
5
Scan the vehicle for OBD-II trouble codes to identify any related issues.
6
Inspect the fuses related to the ignition and fuel systems for continuity.

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is parked on a level surface and the ignition is off.
Tools Required: OBD-II scanner, multimeter, socket set, battery terminal cleaner, jumper cables.

2. Battery Inspection and Testing

Sub-steps:
1. Disconnect the negative battery terminal to prevent any electrical shorts.
2. Clean the battery terminals using a terminal cleaner to remove any corrosion.
3. Reconnect the terminals securely and ensure they are tight.
4. If the battery voltage is below 12.4 volts, jump-start the vehicle or replace the battery.

3. Starter Motor Check

Sub-steps:
1. Access the starter motor by removing any necessary covers.
2. Use jumper cables to connect the starter directly to the battery to bypass the ignition circuit.
3. If the starter engages and the engine cranks, the starter is functioning properly; otherwise, replace the starter.

4. Fuel Pump Inspection

Sub-steps:
1. Locate the fuel pump fuse and relay in the fuse box.
2. Replace the fuse if blown; if not, proceed to test the relay by swapping it with another relay of the same type.
3. If the fuel pump does not activate, check the wiring and connections leading to the fuel pump for damage or corrosion.
4. If necessary, replace the fuel pump.

5. Reassemble and Test

Sub-steps:
1. Ensure all components are reinstalled securely.
2. Reconnect the battery terminals.
3. Start the engine to verify that the issue is resolved.