¿PORQUE NO ARRANCA MI CARRO? (FALTA DE GASOLINA) | MOTORMEX

Summary

In this diagnostic video, a mechanic troubleshoots a 2015 Chevrolet Spark that isn't starting. Using a scanner and diagnostic tools, the mechanic rules out sensor and electrical issues, narrowing down the problem to a fuel delivery failure. After verifying the fuel pump and injectors are functional, the issue is traced to a blown ignition fuse, preventing the injectors from receiving power. Once the fuse is replaced, the engine starts successfully. The mechanic emphasizes the importance of accurate diagnostics and highlights how modern tools make troubleshooting faster and more precise. The video offers valuable insights for auto repair enthusiasts.

Takeaways

• 😀 The diagnostic process starts with checking error codes using an OBD scanner, ensuring that the issue is not electronic or sensor-related.
• 😀 The codes retrieved (P0404 and P0562) are not related to the engine's no-start issue, helping to eliminate certain potential causes.
• 😀 A quick test using the crankshaft position sensor data shows that the sensor is functioning correctly, ruling out issues with it.
• 😀 Despite the absence of spark or injector pulse issues, the engine still doesn't start, suggesting a fuel delivery problem.
• 😀 A test by applying fuel directly into the intake manifold helps confirm that the issue is indeed due to a lack of fuel delivery.
• 😀 The fuel pump is verified using the OBD scanner, and the test shows that the fuel pump is working correctly, delivering fuel to the engine.
• 😀 Injector pulse tests reveal that while there is a pulse, the injectors aren't receiving the necessary power supply.
• 😀 The source of the power supply issue is traced back to a blown fuse in the ignition circuit, which is preventing proper voltage from reaching the injectors.
• 😀 A Power Proof tool is used to verify the functionality of the ignition fuses, identifying the faulty fuse in the process.
• 😀 After replacing the blown fuse, the injectors receive power, and the engine successfully starts, resolving the no-start issue.
• 😀 The repair process demonstrates how systematic and methodical diagnostics can pinpoint the exact cause of the problem without replacing unnecessary parts.

Q & A

What is the initial problem with the 2015 Chevrolet Spark?

The vehicle is not starting, and even though the battery has been drained and recharged multiple times, the engine does not start.

What is the first step in diagnosing the vehicle?

The first step is to perform a scan using a diagnostic tool (CJ 4R) to check for any electronic or sensor-related issues that could prevent the engine from starting.

What does the diagnostic scan reveal about the vehicle’s error codes?

The diagnostic scan reveals two error codes: P0 404 (Exhaust Gas Recirculation control circuit) and P0 562 (low voltage in the system). Neither of these codes is related to the no-start issue.

How is the crankshaft position sensor tested?

The crankshaft position sensor is tested by monitoring the RPM values through the diagnostic tool. If the sensor is working correctly, the RPM value will change when attempting to start the engine.

Why does the mechanic suspect a fuel-related issue?

The mechanic observes that while the engine makes attempts to start, it lacks fuel. This leads to the conclusion that the problem may be due to insufficient fuel delivery to the engine.

What quick test is performed to check the fuel pump?

The mechanic uses the diagnostic tool to activate the fuel pump and verifies that fuel is being pumped correctly from the tank, confirming the pump is functioning.

What was discovered during the inspection of the fuel injectors?

The mechanic finds that while the fuel pump is working, the fuel injectors are not receiving the necessary positive voltage to operate, causing the engine to not start.

What causes the fuel injectors to lack power?

The lack of power to the injectors is traced back to a blown fuse, which prevents the necessary positive voltage from reaching the injectors.

How is the blown fuse addressed?

The blown fuse is replaced with a new fuse of the correct amperage. After replacing the fuse, the vehicle starts successfully.

What does the mechanic suggest as the possible cause for the blown fuse?

The mechanic suggests that the blown fuse may be caused by a short circuit in the wiring, and they plan to monitor the vehicle to ensure the problem doesn't recur.