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How do I troubleshoot a Toyota Highlander that won’t start? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/How do I troubleshoot a Toyota Highlander that won’t start?

How do I troubleshoot a Toyota Highlander that won’t start?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
2-4 hours
Time
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
5 min read
809 words

Problem Statement

Learn how to troubleshoot and fix a no-start condition in a Toyota Highlander (2020-present) with detailed diagnostic steps and repair instructions.

Affected Component
starting system
Estimated Time
2-4 hours

Symptoms

  • •No Crank
  • •Clicking Sound
  • •Dim Lights
  • •Engine Cranks but Does Not Start

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5

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
  • •Battery terminal cleaner
  • •Wrench set
  • •Fuse puller or needle-nose pliers
  • •Jump leads
  • •Spark plug socket
  • •OBD-II scanner
  • •Fuel pressure gauge

Additional Information

Affected Component
starting system
Estimated Time
2-4 hours
Difficulty
medium
Severity
medium
Tools Required
8 items

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Back to Generation

Troubleshooting a Toyota Highlander That Won't Start (Fourth Generation, 2020-Present)

Step 1: Check Battery Condition

Tools Required:

  • Multimeter
  • Battery terminal cleaner
  • Wrench set

Instructions:

  1. Visual Inspection: Check for any corrosion on battery terminals. Clean if necessary with a battery terminal cleaner.
  2. Battery Voltage Test:
    • Use a multimeter to measure the battery voltage. A healthy battery should read around 12.6 volts.
    • If the voltage is below 12.4 volts, the battery may be weak and require charging or replacement.
  3. Load Test: If available, use a battery load tester to check the battery's ability to hold the charge under load.
Step 2: Inspect Fuses

Tools Required:

  • Fuse puller or needle-nose pliers
  • Multimeter (for continuity testing)

Instructions:

  1. Locate Fuse Box: The fuse box is usually located under the dashboard on the driver's side and in the engine compartment.
  2. Check Starter and Ignition Fuses: Identify and remove the fuses related to the starter and ignition system. Refer to the owner's manual for specific fuse locations.
  3. Inspect Fuses: Visually check for blown fuses. Replace any damaged fuses with the correct amperage.
  4. Continuity Test: Use a multimeter to check for continuity in fuses if unsure about their condition.
Step 3: Test the Starter Motor

Tools Required:

  • Multimeter
  • Wrench set
  • Jump leads

Instructions:

  1. Access the Starter Motor: Locate the starter motor, which is usually found on the transmission bell housing.
  2. Check Connections: Ensure that the wiring harness and connections to the starter are secure and free from corrosion.
  3. Direct Power Test:
    • Use jumper cables to connect the positive terminal directly to the starter solenoid terminal.
    • Make sure the vehicle is in "Park" or "Neutral".
    • If the starter engages and the engine cranks, the issue may be in the ignition switch or relay.
  4. Test Starter Relay: If applicable, swap the starter relay with another similar relay in the fuse box to see if that resolves the issue.
Step 4: Ignition System Check

Tools Required:

  • Spark plug socket
  • Multimeter
  • OBD-II scanner (optional)

Instructions:

  1. Check Ignition Key/Start Button: Make sure the key is recognized, or the start button is functioning properly.
  2. Inspect Spark Plugs: Remove one spark plug and check for wear, carbon buildup, or damage.
  3. Ignition Coil Test: Use a multimeter to check for proper voltage at the ignition coil.
  4. OBD-II Scan: If the engine cranks but does not start, use an OBD-II scanner to check for any diagnostic trouble codes (DTCs) related to the ignition or fuel systems.
Step 5: Fuel System Check

Tools Required:

  • Fuel pressure gauge
  • Multimeter (for fuel pump relay)

Instructions:

  1. Listen for Fuel Pump: Turn the key to the "ON" position without cranking. Listen for the fuel pump running for a few seconds.
  2. Fuel Pressure Test: Connect a fuel pressure gauge to the fuel rail. Check if the fuel pressure is within the specifications outlined in the repair manual.
  3. Check Fuel Pump Relay: Test the fuel pump relay by switching it with another relay of the same type or using a multimeter.
  4. Inspect Fuel Filter: If the fuel pressure is low, inspect and replace the fuel filter if it is clogged.
Repair Instructions
Repairing or Replacing Components
  1. Battery Replacement: If the battery is weak or dead, replace it with a new, fully charged battery.
  2. Fuses: Replace any blown fuses with the correct amperage.
  3. Starter Replacement: If the starter motor is faulty, follow these steps:
    • Disconnect the negative battery terminal.
    • Remove the starter motor connections.
    • Unbolt the starter from the engine/transmission.
    • Install the new starter and reconnect all connections.
    • Reconnect the battery and test for functionality.
  4. Ignition Components: If ignition coils or spark plugs are faulty, replace them as per specifications.
  5. Fuel Pump Replacement: If the fuel pump is not functioning, replace it:
    • Remove the fuel tank (if applicable).
    • Disconnect the fuel lines and electrical connectors.
    • Remove the old pump and install the new one, ensuring all connections are secure.
Final Steps
  • After repairs, recheck all systems to ensure proper functionality.
  • Ensure that all tools are accounted for and the work area is clean.
  • If problems persist, consider professional diagnostic services.

By following these detailed steps, you can systematically troubleshoot and potentially resolve the no-start condition in a Toyota Highlander from the fourth generation.