The current clamp is used to measure the electron current in one wire at a time, the preferred method, but it can also be used to measure more than one wire at a time provided the direction of electron current in each wire is known.
Now that we have a general understanding of electron current through a vehicle ground circuit, we continue begin measuring electron current and understand what each reading is telling us about vehicle electrical circuits during Key ON (KON) and engine run (RUN).
The dual ground configuration is very common but now that batteries are mounted in out-of-the-way places outside of the engine department a single battery ground cable is used to ground the battery negative terminal to the engine block.
In tracing electron current, we find an unusual way that generator electron current flows when the engine is running if the battery negative terminal is grounded to the engine block and to sheet metal at the same time.
Diesel engine oil has been taken to a higher level of performance with the development of new American Petroleum Institute (API) specifications known as API CK-4 and FA-4, which were officially released for licensing on Dec. 1, 2016.
We use wiring diagrams in many of our diagnostics, but if we are not careful, they can sometimes lead us to make decisions that are not accurate, which can lead to wasted diagnostic time, unnecessary parts costs for the replacing parts that are not defective, and sometimes even missing a simple repair.
In this article we are going to investigate some of the history of these systems as well as the operation and diagnosing of them when a problem occurs. Moreover, we will investigate some of the radical changes in how we obtain security information and what we will be required to do moving forward.
During NACE Automechanika 2017 Eric Ziegler in his class, “Essential Diagnostics - The Steps You Need To Take In Tackling Every Drivability and Electrical Concern,” outlined his thoughts on what makes a good diagnostic process – a process that can be applied to any troubleshooting challenge you face.
So what to do about HMI? There are a lot of service opportunities that can be addressed because the radio in a vehicle isn’t operating correctly. Unless these vehicles are still under the factory warranty then there are plenty of service options available.
Modern vehicle systems are based on electronic controls over mechanical systems. To diagnose failures within these systems, we must first separate these systems from one another by analyzing the electronic control system. We need to look at a vehicle’s circuits for voltage change over time. This will be accomplished with an oscilloscope.
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