Almost everybody remembers a time when their car had a problem they couldn’t identify. Automotive diagnostics tools allow technicians to gather information from the vehicle itself, helping them accurately pinpoint the cause. NYADI The College of Transportation Technology teaches diagnostics alongside other skills as part of our automotive technology degree and automotive service technology programs. Here, we discuss diagnostics, how they work, and why it’s valuable to your future customers.

What Are Vehicle Diagnostics?

Vehicles are complex machines comprised of electronics and engineering. When there is a malfunction, the cause isn’t always immediately evident. Did the air conditioner stop working because of low coolant or due to an internal breakdown? Why is the engine light flashing? Is the tire really leaking, or is the air pressure sensor broken?

Vehicle diagnostics is the series of processes technicians use to identify a problem. Just like doctors may request medical testing to diagnose the cause of a patient’s symptoms, the technician uses mechanical tests to diagnose a vehicle malfunction. This allows the technician to provide accurate estimates for repair costs and the overall timeline. It allows replacement parts to be purchased in advance, and it helps the repair crew target their efforts for improved effectiveness and efficiency.

How Are Automotive Diagnostics Performed?

Modern automotive diagnostics are typically done by connecting a computerized scanner to the car. The scanner interfaces with the vehicle’s onboard diagnostics system, allowing techs to read information regarding any previously recorded errors. A verification test is also performed to assess all the vehicle’s different systems. Once the test is complete, the scanner will produce codes that clearly display issues present within the vehicle. Computational systems that may be used include:

• On-Board Diagnostics-II (OBD-II): This is a standard protocol used to monitor various vehicle systems, especially those related to performance and emissions.
• Unified Diagnostics Services (UDS): These enable two-way communication between the tester and the vehicle, allowing for more in-depth diagnostics.
• Diagnostics over Internet Protocol (DoIP): This is a tool found in newer vehicles. It allows diagnostics to be performed over Ethernet for faster, more reliable results.
• Keyword Protocol 2000 (KWP 2000): This is an advanced communication protocol that improves the speed and accuracy of diagnostic testing.

Tests may be performed to provide a focused look at a system that is malfunctioning – for example, the engine or the anti-lock braking system (ABS). This approach allows close examination to pinpoint a precise problem. At other times, diagnostics may scan the whole vehicle. These scans are commonly performed during inspections or oil changes as preventative maintenance. By scanning regularly, technicians can identify issues before they become serious.

Of course, diagnostic tests don’t always provide the full picture. Automotive technicians may also perform direct inspection or a road test to find problems the diagnostic system has missed.

The Importance of Vehicle Diagnostics

Whether for troubleshooting problems or preventative maintenance, vehicle diagnostics plays an invaluable role in service and maintenance. When performed correctly, diagnostics can:

• Troubleshoot faster: Computerized diagnostics streamline the troubleshooting process, saving time and reducing guesswork when performing repairs.
• Prevent breakdowns: Regular diagnostics can reveal minor issues before they evolve into major concerns, helping vehicle owners avoid breakdowns and costly repairs.
• Enhance performance: Diagnostics also identify inefficiencies that affect performance. This helps drivers keep their vehicles performing at peak.
• Improve safety: Unidentified malfunctions can compromise safety. By identifying them in advance, diagnostics can help avoid critical failures and ensure safe operation.
• Reduce emissions: Issues with the engine or emissions control may lead to increased pollution. Diagnostics detect problems to reduce environmental impact.
• Meet compliance: Many regions require vehicles to meet certain performance and emissions standards. Diagnostics help keep vehicles compliant.

Learn Diagnostics at NYADI

Automotive diagnostics is an integral part of our programs at NYADI. Because of its importance to drivers, this skill is essential for vehicle technicians to master. This is why we train students in all forms of diagnostics, preparing them for success in their future careers as car mechanics, transmission technicians, service advisors, shop managers, and more.

NYADI is located in Jamaica, New York, with courses available to local students interested in pursuing careers in the automotive industry. To learn more about admissions and financial aid opportunities for those who qualify, contact an admissions representative today.