why does my Toyota Corolla E140 (2006-2013) check engine light flash while driving?

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, basic hand tools.
• Ensure the vehicle is parked on a level surface, and the engine is turned off and cool before starting work.

2. Address Ignition System Issues

1. Remove Ignition Coils:
   • Disconnect the negative battery terminal.
   • Remove the engine cover (if applicable).
   • Unplug each ignition coil connector and unbolt the coils using the socket set.
2. Inspect and Replace Spark Plugs:
   • Remove spark plugs using a spark plug socket.
   • Check for signs of wear or damage (e.g., fouling, excessive gap).
   • Replace with new spark plugs specified for the vehicle (check manufacturer specifications for gap size).
3. Reinstall Ignition Coils:
   • Reinstall ignition coils and secure them with bolts.
   • Reconnect the coil connectors.

3. Evaluate Fuel System

1. Check Fuel Pressure:
   • Connect a fuel pressure gauge to the fuel rail.
   • Turn the ignition on without starting the engine and check for pressure readings (compare with specifications).
   • If pressure is low, inspect or replace the fuel pump and filter.
2. Inspect Fuel Injectors:
   • Remove fuel injector connectors and inspect for damage.
   • Test injectors for proper operation using a multimeter or by performing a flow test.
   • Replace any faulty injectors.

4. Inspect Air Intake System

1. Check Air Filter:
   • Remove the air filter and inspect for dirt or blockages.
   • Replace if necessary.
2. Inspect for Vacuum Leaks:
   • Check all hoses and connections in the intake system for cracks or disconnections.
   • Use a smoke machine or carburetor cleaner to detect leaks; repair any leaks found.

5. Compression Testing

1. Perform Compression Test:
   • Remove spark plugs.
   • Insert compression tester into each cylinder and crank the engine to get readings.
   • Compare results to manufacturer specifications; replace cylinder head gasket or repair engine if compression is low.