Engine won't start Corolla E170

Certainly! An engine that won't start can be caused by a variety of issues. Below is a detailed diagnostic and repair guide for a Toyota Corolla E170 (2013–2019). Follow these steps to identify and potentially solve the issue.

Tools Required:

• OBD-II Scanner
• Multimeter
• Basic Socket Set
• Screwdriver Set
• Battery Tester
• Fuel Pressure Gauge

Step 1: Verify Battery Condition

1. Check Battery Voltage:

   • Use a multimeter to check the battery voltage.
   • A healthy battery should read around 12.6 volts with the engine off.

2. Load Test the Battery:

   • Use a battery tester to perform a load test.
   • Replace the battery if it fails the load test or reads below 12.4 volts.

3. Inspect Battery Connections:

   • Ensure battery terminals are clean and tight.
   • Clean any corrosion using a baking soda and water solution.

Step 2: Check Starter Motor

1. Listen for Clicking Sound:

   • Turn the ignition key to the start position.
   • A clicking sound indicates a faulty starter solenoid or motor.

2. Test Starter Circuit:

   • Check for voltage at the starter terminal using a multimeter.
   • If no voltage, inspect wiring and ignition switch.

Step 3: Inspect Fuel System

1. Check Fuel Level:

   • Ensure the fuel tank is not empty.

2. Test Fuel Pressure:

   • Connect a fuel pressure gauge to the fuel rail.
   • A typical pressure for the Corolla E170 is between 44-50 psi.
   • If pressure is low, inspect the fuel pump, fuel filter, and pressure regulator.

3. Listen for Fuel Pump:

   • Have an assistant turn the ignition key to the ON position.
   • Listen for a humming sound from the fuel tank area, indicating the fuel pump is operational.

Step 4: Check Ignition System

1. Inspect Spark Plugs:

   • Remove a spark plug and inspect its condition.
   • Check for fouling, wear, or damage and replace if necessary.

2. Check Ignition Coils:

   • Use a multimeter to check the primary and secondary resistance of the ignition coils.
   • Compare readings with the service manual specifications.

Step 5: Scan for Diagnostic Trouble Codes (DTCs)

1. Connect an OBD-II Scanner:

   • Read any stored codes in the vehicle’s computer.
   • Common codes related to no-start issues include P0335 (Crankshaft Position Sensor) and P0340 (Camshaft Position Sensor).

2. Interpret Codes and Perform Repairs:

   • Follow specific repair procedures for any detected codes.

Repair Instructions:

If Battery is Faulty:

• Replace Battery:
  1. Remove the negative cable first, then the positive.
  2. Remove battery hold-down bracket.
  3. Install new battery in reverse order.

If Starter is Faulty:

• Replace Starter Motor:
  1. Disconnect the negative battery cable.
  2. Remove electrical connections to the starter.
  3. Unbolt and remove the starter from the engine block.
  4. Install new starter motor in reverse order.

If Fuel System is Faulty:

• Replace Fuel Pump:
  1. Relieve fuel system pressure.
  2. Remove fuel tank access cover.
  3. Disconnect electrical connectors and fuel lines.
  4. Remove and replace the fuel pump assembly.

If Ignition System is Faulty:

• Replace Ignition Coils or Spark Plugs:
  1. Remove engine cover.
  2. Disconnect ignition coil connectors and remove coils.
  3. Replace spark plugs if necessary.
  4. Install new ignition coils and reconnect connectors.

Final Steps:

• After performing necessary repairs, attempt to start the engine.
• Verify the engine starts and runs smoothly.
• Clear any DTCs using the OBD-II scanner and test drive the vehicle to ensure the issue is resolved.

By following these steps, you should be able to diagnose and address the no-start issue with the Toyota Corolla E170. If the problem persists, further inspection by a professional technician may be necessary.