What do you document for known goods?

Joseph Technician Lexington, South Carolina Posted   Latest  

Hello everyone,

I figure I would ask since we have a bunch of guys and gals smarter and with bunches more experience than me. 😁

When you have the time to go through an unfamiliar car what type of known good data do you find useful to document?

I usually grab the basics, cam/crank , in cylinder if I have time, and a FRTD especially on turbo cars to get a sense of known good ve with the boost. But I wanted to ask what you guys like to see and find useful. 

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Mario Diagnostician
Weston, Florida
Mario
 

I'm new to saving psdata files. But am building goods of cam crank and in cylinder. Fuel pump current ramps. Can't say i do much more than that.

+1 Ð Bounty Awarded
Chad Technician
Winter park, Florida
Chad
 

Sorry to cut in on this. I wanted to ask Mario, what scanner are you using on your phone? Care to elaborate on it?

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Albin Diagnostician
Leavenworth, Washington
Albin
 

since I'm a fuel trim guy, I save FRTD from a lot of different makes & models of cars. I pay most attention to the load pid at a WOT shift point. If I am taking any scope shots on vehicles, I always save those too.

+2 Ð Bounty Awarded
Matthew Mobile Technician
Bartlett, Illinois
Matthew
 

CMP/CKP with an ignition sync and in-cylinder is the main thing I grab. A best practice you will want to get into is taking good notes, specifically about phase angle. Many cars phase even at idle, and the waveform can vary greatly (phaser actuaters plugged in vs. unplugged) I usually make sure there is no phase for my known goods. When a tech is referencing one they should know what was done

+3 Ð Bounty Awarded
Angel Technician
Boston, Massachusetts
Angel
 

Curious to know, would you record known goods with both Engine engine at idle and cranking? I’m asking due to cam phasing... from what I know, variable valve timing doesn’t occour when cranking. Thanks in advance.

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Matthew Mobile Technician
Bartlett, Illinois
Matthew
 

The Chrysler 3.6 is an example of an engine that will phase while cranking. Checking the scan tool is always the safest bet.

+2 Ð Bounty Awarded
Angel Technician
Boston, Massachusetts
Angel
 

Good to know, thank you.

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Jim Curriculum Developer
Frederick, Maryland
Jim
 

Everyone seems to focus on known goods with Engine Performance related items. When I get a vehicle that is new to me I like to look at other systems. Vehicle charging system data, HVAC control data and more. The same principles of diagnosis apply to these systems in modern vehicles now. What is normal charge command with what load? What is normal variable displacement compressor command? How

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