Life made much easier with the escan

Adrean Diagnostician Bakersfield, California Posted   Latest   Edited  
Case Study
Driveability
2002 Toyota Tacoma 3.4L (N 5VZ-FE) 4-spd (A340E)
P0171 - System Too Lean Bank 1

First, I want to start by saying I may not be at the level of what you guys in here are. My repects to you guys I have been learning from all of you. Most of you guys have this tool. I made this post for maybe someone still learning like me. Ever since I got this tool it has made fuel trim diagnostics just much easier. Of course, I can use any global obd2 scan tool and still reach a diagnosis. But the escan just makes it much easier, and the less gray hair the better for me at 25 years old ha. But mind you, I’m no Expert in this tool

So I had this Toyota Tacoma 3.4l engine with a p0171. Just a test drive around the block and I have direction. As a mobile tech or just as a tech in general, that’s great because time is money right? So I check my fuel trims using the escan built in fuel trim table, and I notice they are all over the table. 

So what I like about this tool also is the built in volumetric effiency map. It will let me know if the engine is Breathing properly, and my problem is fuel delivery, or if the air metering device is just not reporting the proper air. I use that function next all within this around the block test drive. And from the V.E test, I’m able to figure out I’m under reporting air flow. My actual airflow and theoretical airflow don’t match, but the most helpful is the V.E fuel trim table that follows the V.E it was in red adding fuel for the missing airflow. If it would of had normal fuel trims from my understanding that would of been a mechanical fault in the engine.

With less than 15 mins in this vehicle, I had direction, and that was to check my mass Airflow sensor. Before getting into checking powers and grounds and for a known good signal, a visual inspection is always great, of course after having a direction too. Wouldn’t want to move things around and have the fault disappear. Removing the sensor revealed the heating element filled with debris. A cleaning of the sensor and a road test using the escan I was able to confidently return this vehicle with a fix. Thanks Bernie for this great tool.

+5
Angel Technician
Reading, Massachusetts
Angel
 

Thanks for sharing! I’ve heard of the EScan but have never used one myself. Does it automatically record the data while you’re on the test drive? I’m not familiar with It. 

Still thanks for sharing your case study. Now to do some research on the tool. Lol 

+1 Ð Bounty Awarded
Neal Owner
Albuquerque, New Mexico
Neal
   

Angel,

Yes, it will record live data while doing a test drive. Note that the way it records Fuel Trims and VE it tables while you test drive are very unique but it can also record all selected PIDs to file for as long as you want. You go to the Controls tab and select "Save Selected PIDs Continuously" or press the F9 key to start recording. The eSCAN also graphs continuously and you can save graphed data to file any time you want by pressing "Save Graphed Data" or pressing the F8 key also on the Controls tab.

+3 Ð Bounty Awarded
Adrean Diagnostician
Bakersfield, California
Adrean
 

Thanks for the tips next time I won’t have to take pics with my phone . :) 

0 Ð Bounty Awarded
Scott Manager
Claremont, California
Scott
 

Hi Adrean,

There is another program (free) that I recommend for collecting screenshots. You can configure the tool to become active via keyboard shortcuts. The cool think about this is that you can quickly capture a screen, mark it up with notes, arrows etc and then save it. 

Check out this sample I recorded off of a friends BMW last weekend. Tell me, do you see that this engine is breathing OK or not?

+2 Ð Bounty Awarded
Adrean Diagnostician
Bakersfield, California
Adrean
 

Welll the grams look a bit high for the Engine size at idle but trims are not adding so I suppose it a good breathing engine ?

0 Ð Bounty Awarded
Scott Manager
Claremont, California
Scott
 

Hi Adrian,

The cursor point is looking at the following data I called out in the left margin of the screenshot. This is a turbo vehicle and we were measuring VE. 

Here's another screenshot with more math in the left margin. 

  • Engine Size: 2.0L
  • Cyl Volume: 0.5L
  • Cyl Mass: … grams/liter @ STP)
  • RPM: 6292
  • MAF: 191.4 grams/sec
  • MAP: 199kPa
  • BARO: 97kPa
  • Cyl Air: 0.91 grams/cyl (Grams/cyl = MAF x [constant]/RPM) (191.4x30/6292 = 0.91)

Constant: 60sec * 2 / # of cyls [120/4=30]

Here's a VE Test to back those numbers up: ATG VE Test

As far as the idle goes, note that MAP is 92kPa. Less throttle restriction, regulated valve lift. 

IDLE: MAF: 5.88g/s, RPM: 818, = .21 cyl/air (high but by design)

0 Ð Bounty Awarded
Angel Technician
Reading, Massachusetts
Angel
 

Thank you for the information. Ive heard great things about it, but never used one. Will be looking into purchasing one in the near future. 

+1 Ð Bounty Awarded
Jim Mobile Technician
Southampton, Pennsylvania
Jim
 

GREAT POST and diagnostics, Adrean, A little suggestion for your own knowledge and data base file. Instead of taking a picture of the screen, what I do is hit the "Print Screen" button, drop it into a "Paint" program, then do WHATEVER you want to do to it there for you to remember the job. I then open a POWERPOINT file that I have titled "Former Diagnostics". You can label it however you want, After that you have the files saved in a very convenient place to recall anytime you need it.

AGAIN, Great write up and Thank You for sharing, BTW - I also have that scanner and use it a lot when training others on using the PIDS effectively.

+4 Ð Bounty Awarded
Neal Owner
Albuquerque, New Mexico
Neal
 

Here's a few other very quick ways to get screen shots directly from the eSCAN and any other ATS program:

  1. Press the Ctrl and F11 keys simultaneously (see screen shot below).
  2. Select the File menu and choose Save Screen.
  3. Go to the Controls tab and press the Save Screen button or F11 key. The advantage to #1 & #2 over this method is that they don't make you include the Controls tab in the screen shot.
  4. On Windows 10 computers also try using the "Snipping Tool" and set the Mode to "Window Snip" so you just get the program you ant instead of your entire desktop. This will work on any of your Windows programs, not just ATS!
+3 Ð Bounty Awarded
Jim Mobile Technician
Southampton, Pennsylvania
Jim
 

Thanks for the added tips, Neal

0 Ð Bounty Awarded
Adrean Diagnostician
Bakersfield, California
Adrean
 

Thanks jim I will do . I didn’t know about that. I just use my phone a lot for pics . But I will screenshot from now own for better quality 

0 Ð Bounty Awarded
James Owner/Technician
Pike, Pennsylvania
James
 

I picked the EScan up while in Dallas for the WorldPac training convention because I've heard and read about it. Just need to make some time to get acquainted with it.

Thanks for the push

+2 Ð Bounty Awarded
Jim Mobile Technician
Southampton, Pennsylvania
Jim
 

I'll stop up and show some of the tricks

+1 Ð Bounty Awarded
James Owner/Technician
Pike, Pennsylvania
James
 

I'm up for that

+1 Ð Bounty Awarded