my Honda Accord won't start when it's hot outside, what's causing it?

Honda Accord 9th Generation (2013-2017)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

574 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 Honda Accord when hot. 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 electrical systems.
•Allow engine components to cool before touching them to avoid burns.

Symptoms

•Engine cranks but does not start
•Check engine light illuminated
•Fuel pump not priming
•Unusual clicking noise from the starter
•No response from the ignition switch
•Battery terminals feel hot to touch

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored fault codes.
2
Measure battery voltage with a multimeter; ensure it is above 12.4 volts.
3
Inspect the battery terminals for corrosion and ensure they are tight.
4
Check the starter motor connections for heat damage or loose wiring.
5
Test the fuel pump operation by listening for the pump's priming sound when the ignition is turned on.
6
Verify the condition of the ignition switch by testing for voltage at the starter when the key is turned to the start position.

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
•Torque wrench
•Wire brush

Parts Required

•Replacement battery (if necessary)
•Starter motor (if necessary)
•Fuel pump relay (if necessary)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored fault codes.
2
Measure battery voltage with a multimeter; ensure it is above 12.4 volts.
3
Inspect the battery terminals for corrosion and ensure they are tight.
4
Check the starter motor connections for heat damage or loose wiring.
5
Test the fuel pump operation by listening for the pump's priming sound when the ignition is turned on.
6
Verify the condition of the ignition switch by testing for voltage at the starter when the key is turned to the start position.

Solution

1. Preparation

Ensure that the vehicle is parked on a level surface and the engine is off.
Disconnect the negative terminal of the battery to prevent electrical shorts.
Wear safety gloves and goggles.

2. Inspect and Clean Battery Terminals

Remove the positive (+) and negative (-) battery terminals using a socket wrench.
Clean the terminals and battery posts with a wire brush and a baking soda solution to remove corrosion.
Reattach the terminals securely, ensuring no corrosion remains.

3. Test and Replace the Battery (if necessary)

If the battery voltage is below 12.4 volts, load test the battery using a battery tester.
If the battery is weak, replace it with a new one, ensuring it matches the specifications of the original battery.
Reconnect the battery terminals.

4. Check and Replace the Starter Motor (if necessary)

If the starter motor shows signs of overheating or failure, remove it by disconnecting the wiring harness and bolts.
Install a new starter motor by reversing the removal steps, ensuring all connections are secure.
Use a torque wrench to tighten the starter motor bolts to manufacturer specifications (typically around 15-20 ft-lbs).

5. Inspect and Replace Fuel Pump Relay (if necessary)

Locate the fuel pump relay in the fuse box and test it for continuity using a multimeter.
If faulty, replace it with a new relay of the same specifications.
Reassemble any components removed during access.