Diagnostics Archives - Page 8 of 46 - UnderhoodService
The March Digital Edition Is Now Available To Download, Read

ShopOwner includes technical and management content and is free to download and read.

K-Tool Offers Professional Technician Diagnostic Tools

The new tools include a thermal imaging camera, a video borescope and a smoke machine.

Understanding Stop/Start Charging and Starting Systems

The problem may not have been caused by a complicated reason, something simple may have caused the system not to work.

GM Active Fuel Management System Service

The AFM activation and deactivation are controlled by the Valve Lifter Oil Manifold or VLOM.

Diagnosing Catalytic Converter Problems (Video)

There are multiple steps to diagnosing a possible air related issued on a catalytic converter. Sponsored by AP Emissions.

Fuel Injector Wave Forms

Diagnosing a fuel injector circuit with a scope can help you to confirm the health of the drivers and injectors.

Ignition Diagnostics

This part of the cycle is when the mixture of air and fuel ignites and how the flame front spreads in the cylinder.

Fuel Injector Waveform Diagnostics

On the majority of injectors, an electromagnetic coil is energized by a driver in the engine control module.

Ignition Coil Swap Diagnostics (VIDEO)

Here’s what can happen to an engine if you use this diagnostic shortcut. Sponsored by Standard Motor Products.

Understanding Engine Control Module No Communication Issues

You plug in your diagnostic scanner or code reader, only to find out that you cannot communicate with the PCM. Bad PCM Right? Not necessarily!

Handling A Car That Won’t Start (Video)

Automatic start-stop systems are putting more stress on the starter and battery. Sponsored by The Group Training Academy.

Diagnosing A Faulty Alternator (Video)

There are a whole host of issues that could happen to an alternator. This video is sponsored by The Group Training Academy.