Scan Data Diagnostics (Jeep Loses Power)

 Going through some old files I had saved on the old Snap-on SOLUS PRO. This particular file was a data recording during the test drive on a 1994 Jeep with 2.5 engine. The complaint was a power loss on acceleration. Line A is the feed from the front oxygen sensor. The oxygen sensor should be a constant rich to lean switching except under certain circumstances, like when you should have more fuel coming in as during hard acceleration.  Line B is the injector pulse width or just how long the fuel injector should be open. It should go full stream when the computer is demanding fuel. Line C is the throttle position which increases as the throttle is pressed. Line D is the oxygen sensor status which I'm using here to back up or verify what I'm seeing from the front O2 signal. I was mainly wanting to see these items to see if I had a fuel delivery problem. There was a point in time when you would have to drive with a fuel pressure gauge taped to the windshield to check this sort of thing. I don't miss those days a bit. 

Now in C you can see two points in time that I put the pedal to the metal with a brief release between the two. In B you can see the injector pulse width immediately being commanded to allow more fuel through the injectors. 

What you can also see, by looking at lines A and D is that even though I have throttle demanding more fuel and injectors commanded to allow more fuel I am not getting more fuel. The front O2 voltage goes dead lean for both events with a brief activity when I allowed the throttle to return between punches. The O2 status remained lean for the entire event. It does back up the fact that I wasn't getting enough fuel. Which was a bad fuel pump. 

Thanks for reading. 

Kenny@GGAuto.Repair

Scan Tool Review: Offline Repair Info (10)

 Last but not least in the Genisys line. Actually the first one I purchased, the OTC SPX Genisys w/2.0 software. I even have piggybacked the software reader for the previous OTC 4000 Enhanced OBD1 software. 

Thanks for reading.

Kenny@GGAuto.Repair

Scan Tool Review: Offline Repair Info (9)

 The other Genisys EVO I have is running 4.0 software and cuts off at 2009 but still functions as a diagnostic tool and the repair database covers through 2009. 

Thanks for reading.

Kenny@GGAuto.Repair

Scan Tool Review: Offline Repair Info (8)

 The Genisys EVO 5.0 at one time was the very best in diagnostic tools in the shop. It is the last of the Genisys line I used before moving to the Encore. I think the database is covering up to 2011 so still has some uses in the shop, and of course the generic OBDII will access models past 2011 for basic checks. 

Thanks for reading.

Kenny@GGAuto.Repair

Scan Tool Review: Offline Repair Info (7)

 The actron AutoScanner Plus is yet another of my no longer supported scan tools but I feel I should mention that even though this doesn't support oem specific cars beyond 2015 it is still very capable of reading generic OBDII systems as are the MX808 and the Encore. Around 2003 CAN networks were becoming the norm so most any scan tool that can read CAN will still read later model cars as generic. What the tool does have that makes it eligible for the list of tools with repair information is a data base of trouble code definitions that allows you to look up a specific code. 

Thanks for reading.

Kenny@GGAuto.Repair

Scan Tool Review: Offline Repair Info (6)

Okay, the Autel MX808 came out in 2017 with Android 4.4.4 operating system. In late 2022 the MX808S was released with updated hardware and Android 11. In 2023 the MX900 followed as the official replacement and the MX808 eventually was officially discontinued. It does however still receive updates for diagnostics and is still functional in that regard. Similar to the demise of the OTC Encore the Android sytem in the background became outdated though at one time it had a wealth of repair information access. iATN is still available and the MaxiFix service. The tool is not useful for web searches but still very able to help with diagnostics. 

  Thanks for reading.

Kenny@GGAuto.Repair

Scan Tool Review: Offline Repair Info (5)

 OTC stopped support for the Encore scan tool 10/24 but the Android 4.2.2 operating system it ran on had been losing abilities for awhile. Ten years on Android 4.2.2 is remarkable but its time had come. The great thing OTC did for the Encore users was not just leave us with an outdated and unsupported system and with us good luck. No. They not only let us keep the Encore which still functions well as a diagnostic tool but gave us what amounts to the upgraded version. The Bosch ADS525 X was sent to us, included with a year of updates and a trial of wiring diagram access. The Bosch tool uses Android 10 and a Google Chrome browser for web searches and results and also has links pre-installed to Motor TruSpeed Repair and Wiring Diagrams. Under the Repair Information header are IDENTIFIX, Mitchell1, ALLDATA, Autodata and MOTOLOGIC links. An OEM header with links to manufacturer sites and the Tech Communities header with iATN and TST links. Relevant subscriptions to those sites required of course. 

Thanks for reading!

Kenny@GGAuto.Repair