my Toyota Corolla E170 (2013-2019) has a hard time starting in the morning, what's causing it

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

599 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 hard starting issues in the 2013-2019 Toyota Corolla E170. 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.
•Allow the engine to cool before opening any components related to the cooling system.

Symptoms

•Engine cranks but does not start immediately
•Extended cranking time before the engine starts
•Rough idle after starting
•Engine stalling shortly after starting
•Battery warning light illuminated
•Decreased fuel economy

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any stored trouble codes.
2
Inspect the battery for voltage and terminal corrosion; ensure it is fully charged and connections are tight.
3
Check the fuel pump operation by listening for the pump priming sound when the ignition is turned on.
4
Test the fuel pressure with a gauge to verify it meets the manufacturer's specifications.
5
Inspect the spark plugs for wear or fouling; replace if necessary.
6
Check the engine coolant temperature sensor for proper operation, as it can affect starting.

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
•Fuel pressure gauge
•Socket set
•Torque wrench
•Wire brush

Parts Required

•New battery
•Fuel pump
•Spark plugs
•Coolant temperature sensor

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any stored trouble codes.
2
Inspect the battery for voltage and terminal corrosion; ensure it is fully charged and connections are tight.
3
Check the fuel pump operation by listening for the pump priming sound when the ignition is turned on.
4
Test the fuel pressure with a gauge to verify it meets the manufacturer's specifications.
5
Inspect the spark plugs for wear or fouling; replace if necessary.
6
Check the engine coolant temperature sensor for proper operation, as it can affect starting.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the battery to prevent electrical shock.

2. Battery Inspection and Replacement

Sub-steps:
- Remove the battery terminals (negative first, then positive).
- Clean battery terminals with a wire brush to remove corrosion.
- Test the battery with a multimeter; replace if voltage is below 12.4 volts.
- Install the new battery, connecting the positive terminal first, then the negative.

3. Fuel System Inspection

Sub-steps:
- Locate the fuel pump relay and remove it.
- Use a multimeter to test the relay for continuity; replace if faulty.
- Reinstall the relay and connect a fuel pressure gauge to the fuel rail.
- Turn the ignition to the ON position (do not start) and check the gauge reading; it should match manufacturer specs (approximately 40-50 psi).
- If the pressure is low, replace the fuel pump.

4. Spark Plug Replacement

Sub-steps:
- Remove the ignition coil cover (if applicable) to access the spark plugs.
- Remove the ignition coils and set them aside.
- Use a spark plug socket to remove the spark plugs; inspect for wear and replace if necessary.
- Gap the new spark plugs according to specifications and install them, torquing to the manufacturer’s recommended value.

5. Engine Coolant Temperature Sensor Check

Sub-steps:
- Locate the coolant temperature sensor (usually near the thermostat housing).
- Disconnect the electrical connector and remove the sensor.
- Use a multimeter to check the resistance of the sensor; replace if it is out of spec.
- Install the new sensor and reattach the electrical connector.