Auto Xray scanner (long)
Thread Starter
Racer
Joined: Oct 2002
Posts: 416
Likes: 2
From: Westfield MA
Auto Xray scanner (long)
I have an Auto Xray EZ Scan 3000 for OBD 1 systems. It will only scan with "key on, engine off". I tried to scan with the engine running and it will not recognize the cars ECM. You can here the idle change a little when you plug it in with the engine running. I assume the cars ECM is going into the "diagnostic" mode as soon as the connection is made. I called Auto XRay and they said their scanners do not support GM OBD 1 with the engine running, just "key on, engine off" mode. Guess I wasted some $$ on this thing. Whats puzzling is the read out I get when I scan with the engine not running. It shows data as if it were running: rpm-644, 02-408mv, 02 cross counts-36, block learn-155,BLK LRN cell-1, iac-144 steps, spark advance-19.9, knock sensor-26, inj pulse-1.70 mS, mass air flow- 23 gr/sec, rich lean flag-lean, loop status -open. Are these readings what the ECM on the car stored from the last engine run? Whatever, I need to diagnose my high N0x problem and it doesn't look like this Auto Xray unit is going to do what I had hoped( scan in real time with the engine running). Anyone else have any experience with Auto Xray on OBD 1??
Edit: Moderator-------- I think I should have posted this in "scan and tune". Any way to move it over there?
Edit: Moderator-------- I think I should have posted this in "scan and tune". Any way to move it over there?
Last edited by SS409 425HP; Aug 17, 2005 at 12:48 PM. Reason: Wrong area
Burning Brakes
Joined: Feb 2000
Posts: 1,247
Likes: 2
From: Parker, Colorado, USofA
Originally Posted by SS409 425HP
I have an Auto Xray EZ Scan 3000 for OBD 1 systems. It will only scan with "key on, engine off". I tried to scan with the engine running and it will not recognize the cars ECM. You can here the idle change a little when you plug it in with the engine running. I assume the cars ECM is going into the "diagnostic" mode as soon as the connection is made. I called Auto XRay and they said their scanners do not support GM OBD 1 with the engine running, just "key on, engine off" mode. Guess I wasted some $$ on this thing. Whats puzzling is the read out I get when I scan with the engine not running. It shows data as if it were running: rpm-644, 02-408mv, 02 cross counts-36, block learn-155,BLK LRN cell-1, iac-144 steps, spark advance-19.9, knock sensor-26, inj pulse-1.70 mS, mass air flow- 23 gr/sec, rich lean flag-lean, loop status -open. Are these readings what the ECM on the car stored from the last engine run? Whatever, I need to diagnose my high N0x problem and it doesn't look like this Auto Xray unit is going to do what I had hoped( scan in real time with the engine running). Anyone else have any experience with Auto Xray on OBD 1??
Burning Brakes
Joined: Feb 2000
Posts: 1,247
Likes: 2
From: Parker, Colorado, USofA
Originally Posted by SS409 425HP
What year is your car? Mine is a 1987.
Thread Starter
Racer
Joined: Oct 2002
Posts: 416
Likes: 2
From: Westfield MA
I went online and downloaded the latest software to my PC and then did another download to the scanner with the latest "tool" software. Still doesn't work with the engine running. The guy I talked to at Auto Xray seemed like a sales type person. I could hear him in the background asking a tech about my problem. I asked him specifically if this scanner would work with the engine running and he said no ------ it did not support GM OBD 1 with the engine running. I tried several times and it will not scan with the engine running. As soon as I plug it in, the idle goes a little higher which I assume is caused by the cars ECM going into "diagnostic" mode which sets a predetermined idle speed and spark advance.
Burning Brakes
Joined: Feb 2000
Posts: 1,247
Likes: 2
From: Parker, Colorado, USofA
Yeah, that sounds about right. IIRC, there's a MON key that you press, after it connects, you select the rightmost button and select something like 'stream'.
I forget, I'll look into it tonight. You MAY be running into a problem where the equipment is so outta date that the folks that make it don't HAVE firsthand experience anymore.
You can tell when it's talking because the fuel calculation stuff on the dash goes away too.
I forget, I'll look into it tonight. You MAY be running into a problem where the equipment is so outta date that the folks that make it don't HAVE firsthand experience anymore.
You can tell when it's talking because the fuel calculation stuff on the dash goes away too.
Drifting
Joined: Jun 2001
Posts: 1,704
Likes: 459
From: Mass Mass
The OBD-1 needs a 10k resistor between pins A & B to start the diagnostics communication.
I have a very old OBD 1 AutoXray, and a newer OBD-2 one.
I had the same problem with the newer one, checked A & B when I hit the scan button and the old one flashed 10K across A&B the newer one did not.
You might try jumpering a 10k resistor somehow (across A&B) and see if the commucation starts. I never bothered to try because I had the old one around.
I have a very old OBD 1 AutoXray, and a newer OBD-2 one.
I had the same problem with the newer one, checked A & B when I hit the scan button and the old one flashed 10K across A&B the newer one did not.
You might try jumpering a 10k resistor somehow (across A&B) and see if the commucation starts. I never bothered to try because I had the old one around.
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Le Mans Master
Joined: Aug 2003
Posts: 9,884
Likes: 3
From: Magnolia Mississippi
St. Jude '03-'04-'05-'06-'07
Originally Posted by STEVEN13
On my 1992 my AutoXray EZ scan 3000 works fine when running. I also upgraded the scanner so it now also works on OBD2.
Are you 1st hitting the scan button?
Steven
Are you 1st hitting the scan button?
Steven
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
Mine works - key on or running, but I have a heck of time getting it to communicate sometimes. Often I have to bend, wiggle the cable, plug it in and then unplug it and after the upteenth try, it works. I just figured that I spent so much time jamming paperclips in the Diagnostic Link that I've spread the terminals too far. Who knows - worked fine on all my other OBD 1 cars.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
I can't help with the AutoXray, But high NOx is the result of excessive combution temps. Make sure your timing is set to spec and then check out the EGR valve. The purpose of the EGR is NOx emissions.
RACE ON!!!
RACE ON!!!
Thread Starter
Racer
Joined: Oct 2002
Posts: 416
Likes: 2
From: Westfield MA
Originally Posted by STEVEN13
On my 1992 my AutoXray EZ scan 3000 works fine when running. I also upgraded the scanner so it now also works on OBD2.
Are you 1st hitting the scan button?
Steven
Are you 1st hitting the scan button?
Steven
Thread Starter
Racer
Joined: Oct 2002
Posts: 416
Likes: 2
From: Westfield MA
Originally Posted by CFI-EFI
I can't help with the AutoXray, But high NOx is the result of excessive combution temps. Make sure your timing is set to spec and then check out the EGR valve. The purpose of the EGR is NOx emissions.
RACE ON!!!
RACE ON!!!
Le Mans Master
Joined: Oct 2004
Posts: 6,314
Likes: 508
From: South-central Missouri
Contact AutoXray...
Originally Posted by SS409 425HP
I have an Auto Xray EZ Scan 3000 for OBD 1 systems. It will only scan with "key on, engine off". I tried to scan with the engine running and it will not recognize the cars ECM. You can here the idle change a little when you plug it in with the engine running. I assume the cars ECM is going into the "diagnostic" mode as soon as the connection is made. I called Auto XRay and they said their scanners do not support GM OBD 1 with the engine running, just "key on, engine off" mode. Guess I wasted some $$ on this thing. Whats puzzling is the read out I get when I scan with the engine not running. It shows data as if it were running: rpm-644, 02-408mv, 02 cross counts-36, block learn-155,BLK LRN cell-1, iac-144 steps, spark advance-19.9, knock sensor-26, inj pulse-1.70 mS, mass air flow- 23 gr/sec, rich lean flag-lean, loop status -open. Are these readings what the ECM on the car stored from the last engine run? Whatever, I need to diagnose my high N0x problem and it doesn't look like this Auto Xray unit is going to do what I had hoped( scan in real time with the engine running). Anyone else have any experience with Auto Xray on OBD 1??
Edit: Moderator-------- I think I should have posted this in "scan and tune". Any way to move it over there?
Edit: Moderator-------- I think I should have posted this in "scan and tune". Any way to move it over there?
P.
Melting Slicks
Joined: Sep 2003
Posts: 2,270
Likes: 118
From: N. Babylon NY
Originally Posted by SS409 425HP
I hit the "scan" button with the engine running. After a few seconds, I get a "vehicle not responding" message. I discovered if I hit the "data" button, a menu appears with three choices; 1-operational data, 2-trouble codes, 4-EZ-PC. I chose 1(operational data) and get a message that says "initializing, please wait". After a few seconds I can see data(four lines at a time due to screen size). I can scroll down thru the list to the last item (41) which is "Loop Status". If I hit the "mon" button, the item number that is highlighted will flash and read "real time" for that individual item.
If it still does not work try configuring with another year. Also call Autoxray and demand to speak to someone in tech.
Good luck,
Steven
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by SS409 425HP
I just installed a new EGR valve two days ago. The ports in the intake manifold were fairly clean. I checked the EGR vacuum solenoid per my Helms manual and it checked ok. I reset the timing down to 4 degrees (was at 8 degrees). Didn't change the N0x reading at all. The Hc and Co readings were well within the allowable limit. The only thing I have changed since my test two years ago was a new main cat (catco 9118). I gutted the precats due to the R/H side rattling inside.
RACE ON!!!
Drifting
Joined: Oct 2004
Posts: 1,976
Likes: 0
From: Patchogue NY
I have the EZ Scan 3000, and it works fine while the car is running. It will even tell me when I turn my AC on, it will indicate if the AC clutch is off, or engaged. As my father used to tell me RTFM. Can anyone help out with the acronym?
Joe B.
Joe B.
