Back Pressure Testing Tip Clip
In this excerpt from the A8 ASE test prep program, Instructor Dave Hobbs discusses some tips and tricks regarding various ways to perform a back pressure test. He also talks about how to make your own tool for this purpose and tells you what to look out for on the ASE A8 exam regarding back pressure related questions.
Alternative Load Test Techniques Tip Clip
Instructor Dave Hobbs talks about voltage drop testing issues where the circuit you’re testing doesn’t really have the current flow going through it like it should. It may not be due to the fact you have a big voltage drop from a large resistance source in the wiring or the connections. It could be a couple of problems. It could be the wiring and connections, in addition to a component that’s either inoperative or not drawing enough current as it normally would. In this tip clip we talk about these things and some alternative ‘MacGyver like’ load testing techniques you can try.
A8 Spark Timing Technical Tip Clip
Section two of the ASE A8 task list is where you find ignition systems. In this video tip clip with instructor Dave Hobbs we’re going to do some cylinder balance testing, which will give us an idea if there is a misfire, and if so, which cylinder it is. And that oftentimes goes hand in hand with ignition diagnosis.
A8 Test Prep
AVI instructor Dave Hobbs takes the “show me” approach as he passes along his experience in the bay with engine performance problems.
A8 Tech Tip: Two Stage Temp Sensor
Instructor Dave Hobbs gives some insight into something a lot of techs already know about and may just take for granted–two stage temperature sensors. He covers some specifics about the sensors, testing procedures, and how to avoid replacing parts that are good only to find you still have a problem. He also gives some details and insight into the differences in design and wiring of these sensors between the individual manufacturers.
EVAP Diagnostics
AVI has brought together two of our best instructors, Bill Fulton and Dave Hobbs, to present a comprehensive overview of the diagnostics on these systems.
Hybrid A/C Compressor Fuse Tech Tip
In this tip clip, Instructor Dave Hobbs talks about the Hybrid A/C compressor fuse on a Gen 3 Toyota Prius. He provides some hands-on info about how and where to find the fuse. He discusses safety and techniques for properly testing the DC current air conditioning fuse to the DC mini inverter compressor used in late model Toyota and Lexus.
Hybrid Data PIDS Tech Tip
In this hybrid vehicle tech tip Dave Hobbs talks about an ‘engine stop request code. If you’ve got a hybrid vehicle and you’re not sure– is it doing an idle stop or is it just stalling– because we have still have an internal combustion engine and that means we still have all other kinds of sensors that can cause drivability issues, including intermittent stalling conditions. Thats why Dave talks about the engine stop request PID and how it can keep you from chasing the boogeyman.
FRED on Evap Tip Clip
In this Tip Clip Dave Hobbs talks about EVAP and FREDS, you know Frustrating Ridiculous Electronic Devices, things like PCM’s and ECM’s. He talks about the logic of how these devices control the operation of the vehicle’s evap system. He discusses how the ‘brain’ of the evap system handles things like the operational nature of the evap system such as purge. He also goes into detail regarding how the FRED also handles the regulatory side of things such as EPA guidelines and leak tests.
Shorted Motor Gen Tech Tip
In this hybrid tech tip clip instructor Dave Hobbs talks about the hybrid battery disconnects and how important it it for you as a technician to know how to know the procedures to deactivate and shut down hybrid voltage systems in order to safely and efficiently even be able to service other non hybrid systems on a vehicle.
