What Is Diagnostic Testing?

Car diagnostic testing is a process that uses specialized tools to communicate with your vehicle’s onboard computer system. Your car's computer, often referred to as the Engine Control Unit (ECU), constantly monitors various systems through sensors. If a sensor detects something abnormal—like poor engine performance or a faulty component—it triggers a warning light on your dashboard, such as the check engine light.

Diagnostic testing retrieves error codes stored in the system, providing insight into the root cause of the issue. While the codes offer a starting point, they must be interpreted by skilled technicians who can perform further testing and inspection to confirm the problem.

When Would I Need A Computer Diagnostic?

You should bring your vehicle to Guzman Automotive for a diagnostic whenever warning lights appear on your dashboard. These lights signal that your vehicle’s computer system has detected an issue that needs attention. Common warning lights include:

• Check Engine Light: This light indicates a problem with the engine, emissions system, or other critical components. It can signal anything from a loose gas cap to a more serious engine issue.

• Battery Light: Warns of issues with your vehicle’s battery or charging system, such as a failing alternator, a weak battery, or poor electrical connections.

• Voltage Light: Suggests an imbalance or malfunction in the electrical system, which may impact the alternator, voltage regulator, or other power distribution components.

• ABS Light: This light alerts you to a problem with the anti-lock braking system, which could compromise your vehicle’s ability to maintain traction during hard braking.

• Airbag Light: This indicates a fault in the airbag system, such as a failed sensor or a wiring issue, which could prevent the airbags from deploying in an accident.

• Traction Control Light: This light signals that your vehicle’s traction control system has detected a problem, such as a faulty sensor or wheel slippage, which can reduce handling stability.

What Issues Can Diagnostic Testing Identify?

Modern vehicles rely on advanced computer systems to monitor and control essential functions. When something goes wrong, diagnostic testing can pinpoint the exact problem, saving time and preventing unnecessary repairs. Below are some of the most common issues that diagnostic testing can uncover:

• Engine Performance Issues

• Transmission Problems

• Emissions Control Failures

• Electrical Malfunctions

• Brake and ABS System Errors

• Airbag and Safety Features

How We Perform Diagnostic Testing at Guzman Automotive

At Guzman Automotive, we take pride in our thorough and efficient diagnostic process. Here’s how we do it:

Step 1: Connecting Diagnostic Equipment

We connect advanced diagnostic tools to your vehicle’s onboard diagnostic port (OBDII) to retrieve error codes from the computer system.

Step 2: Code Analysis

Our skilled technicians interpret the error codes to identify the potential source of the issue. While the codes point us in the right direction, further testing and inspection are often necessary.

Step 3: Component Inspection

Once we’ve identified the system affected, we perform a detailed inspection of the related components to confirm the diagnosis and determine the extent of the problem.

Step 4: Comprehensive Report

We provide you with a clear, detailed report explaining the issue, the repairs needed, and an estimated timeline for completion.

Why Choose Guzman Automotive for Diagnostics?

At Guzman Automotive, we’re committed to providing the highest level of care for your vehicle. Here’s what sets us apart:

• Experienced Technicians: Our ASE-certified technicians have years of experience in diagnosing and repairing vehicles of all makes and models.

• Advanced Equipment: We use state-of-the-art diagnostic tools to quickly and accurately identify issues.

• Transparent Communication: We explain our findings and recommendations in detail so you’re always informed about your vehicle’s condition.

• Reliable Repairs: Once the issue is diagnosed, we offer efficient and dependable repair services using high-quality parts.