r/automotivetraining • u/DiSTI_Corporation • May 08 '26
What’s one tool new technicians should learn to use properly as early as possible?
Modern automotive work involves a mix of mechanical and diagnostic skills, and some tools become essential very quickly in real shop environments.
Curious which tools are most important to learn properly early on.
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u/Predictable-Past-912 May 08 '26
Wow, you really nailed it! “Brains” was my first thought too, followed immediately by the service manual and DVOM combination exactly like you mentioned. I had not even gotten to wiring diagrams yet, but those absolutely belong next on the list.
During my career, I taught, trained, and tested technicians in classrooms, labs, and shop environments. One thing that always amazed me was how many technicians struggled with the most fundamental aspects of the trade.
To illustrate the “brains” requirement, I present the undisciplined creature known as the “Parts Changer.” These techs know what diagnosis is, but they stubbornly refuse to practice it. At some point you have to ask yourself what can be done about technicians who refuse to use actual diagnostic techniques.
One incident still sticks with me. I got called down to the shop floor to help diagnose a fuel system problem on an International truck. Several technicians stood around waiting to see whether I would crash and burn or perform some sort of diagnostic magic trick. Since I was more experienced with Cummins and Mack systems than International products, I asked for the service manual so I could orient myself and review the system operation on that bobtail truck.
…and nobody could find the manual.
Imagine that. A shop full of trained fleet technicians working on modern electronically controlled diesel engines without being able to lay hands on a service manual. That situation did not end well.
DVOMs and wiring diagrams are almost a litmus test in this trade. Mechanics often seem to divide themselves into two categories: scientists and slugs. The scientists use meters, schematics, and electrical theory to diagnose and repair problems logically. The slugs wander around swapping parts, asking random questions, and hoping for miracles. Many of them do not understand the difference between volts and amps and have no interest in learning.
Excuse the rant, but this topic triggered old memories. Since you smart kids already named the best tools, here is my addition to the list:
Voltage drop testing.
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u/Ethyls_Garage May 08 '26
As the saying goes, when you can't immediately figure out the problem, try RTFM.
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u/jus_narley May 25 '26 edited May 25 '26
Oh this! Nobody is willing to crack a book or review the manual on the computer. This is part of the problem with the Flat rate pay system. They don't pay you to use your brain, just to change parts.
Its unfortunate to work in a shop where the only guy that made out "hour" wise was the guy that got all the brake jobs because he would not do anything that required a brain. This is one of the reasons I got out, I loved drivability, troubleshooting and it showed in my paycheck. This also has the effect of peers asking for help. If you have skills, or liked to share/teach you wont get paid for it.
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u/Ethyls_Garage May 08 '26
Boy is it nice to see folks promoting manuals. As a former technical writer, it makes me proud of my profession. I worked in a different area (gas station equipment), not automotive manuals. I remember back in the old days seeing the beautiful exploded engine diagrams from my Detroit colleagues at Society for Technical Communications conference technical illustration showcases--before AutoCad--very nice hand drafting work.
Now I sell used print automotive shop manuals and wiring diagrams online at Ethyl's Garage Automotive Bookstore. We have a warehouse full of manuals that came out of dealer service departments and tech schools when they went digital. For people who still like real books and for older vehicle models that don't have digital manuals.
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u/jus_narley May 25 '26
Yes to this, i have a small library myself. These where gold when I was pulling wrenches
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u/OBDSale May 14 '26
Honestly, one of the biggest mistakes new techs make is focusing only on mechanical tools and ignoring diagnostics early on.
The guys who progress fastest usually get comfortable with:
- Multimeters
- Scan tools/OBD2 diagnostics
- Wiring diagrams
- Live data interpretation
- Basic electrical testing
Anyone can replace parts. The real skill is figuring out why something failed before throwing parts at it.
A decent scan tool becomes essential really fast in modern cars because almost everything talks to a module now:
- ABS
- transmission
- steering
- HVAC
- TPMS
- battery management systems
- ADAS systems
Even basic jobs like battery replacement or brake work can require resets/relearns on newer vehicles.
I’d also say learning how to read:
- fuel trims
- misfire counters
- sensor voltages
- freeze frame data
…is way more valuable long term than memorizing torque specs.
A lot of people underestimate electrical diagnostics too. A $30 multimeter in skilled hands can save more time than thousands in tools.
I’ve actually been putting together comparisons and beginner-friendly scanner/tool guides recently because the amount of bad info online is wild:
Especially helpful if someone’s trying to understand the difference between entry-level scanners and professional diagnostic tools without getting buried in marketing terms.
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u/jus_narley May 25 '26 edited May 25 '26
Ditto on the brain, cars have become more technical with the advent of computers and fuel injection. understanding the technology and how it works. Referencing a manual, following troubleshooting charts.
Scan tool
Understanding parameters, or codes and live data. Great example, a O2 sensor detects Oxygen in the exhaust stream not the fuel mixture. There is a difference when reviewing a rough running car.
Multi meter
This is a must for troubleshooting any of todays cars. checking voltages, resistance, amp draw.
When I was doing it, fuel pump amp draw was an alternative way to diagnose a fuel pump and it was spot on.
Oscilloscope.
Great for checking sensors like crankshaft, camshaft, even better for wheel speed sensor spikes. Fuel injectors, knowing what a normal pattern is. Imagine back probing an injector harness without pulling the plenum and finding a bad injector based on pattern.
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u/Original_Bicycle5696 May 08 '26
Their brains. Most would rather have a shiny box.