my Toyota Corolla E140 (2006-2013) won't start but battery is good what could it be

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery to ensure safety while working.

2. Inspect Fuel System

• Fuel Pump Relay Check:
  • Locate the fuel pump relay in the fuse box.
  • Remove the relay and test it with a multimeter for continuity.
  • Replace the relay if defective.
• Fuel Filter Inspection:
  • If necessary, replace the fuel filter if it is clogged.

3. Check Ignition System

• Spark Plugs:
  • Remove a spark plug wire and insert a spark tester.
  • Crank the engine and check for spark. Replace plugs if no spark is detected.
• Ignition Coil:
  • Test the ignition coil with a multimeter for resistance according to specifications; replace if out of range.

4. Starter Motor Diagnosis

• Starter Test:
  • Disconnect the starter motor from the vehicle.
  • Connect the starter directly to the battery using jumper cables.
  • If the starter does not engage, replace it.

5. Reassemble and Test

• Reconnect all components and ensure all connections are secure.
• Reconnect the battery terminal.
• Attempt to start the vehicle.