UNABLE TO SCAN ENGINE CODES - ZR-1 Net Registry Forums

GOFAST · 07-17-2012

I have a '95 with 9000 miles. The "Service Engine Soon" light comes on intermittantly, stays on for a few seconds, and then goes out. I have tried to capture the stored codes using a scanner but the scanner has been unable to connect/communicate with the ECM.

Two different scanners have been unable to link/communicate with the host but both work fine on my other car. My '95 has a OCB2 connector. Any idea as to why the scanners can't connect with the ECM?

Thanks.

VetteMed · 07-17-2012

95 has an OBDII connector, but is OBDI. You can't use an OBDII scan tool to talk to the ECM. You need an OBDI scan tool with the OBDII connector.

scottfab · 07-17-2012

Quote:

Originally Posted by GOFAST

I have a '95 with 9000 miles. The "Service Engine Soon" light comes on intermittantly, stays on for a few seconds, and then goes out. I have tried to capture the stored codes using a scanner but the scanner has been unable to connect/communicate with the ECM.

Two different scanners have been unable to link/communicate with the host but both work fine on my other car. My '95 has a OCB2 connector. Any idea as to why the scanners can't connect with the ECM?

Thanks.

Does the scanner lit say it works with a 95 ?

GOFAST · 07-17-2012

My scanner is both OBDI and OBDII compatable. How do I assure the scanner is in OBDI mode with the OBDII connector?

Thanks.

ghlkal · 07-17-2012

I know the 95 is a hybrid with OBDI but an OBDII connector.

Can you do the earlier OBDI "trick" of connecting pin "12" to pin "4" (I think those are the right connectors on a 95) and turn the ignition on and have the dash display CCM and ECM parameters?
http://www.zr1.net/forum/showthread.php?t=17846

scottfab · 07-18-2012

Quote:

Originally Posted by GOFAST

My scanner is both OBDI and OBDII compatable. How do I assure the scanner is in OBDI mode with the OBDII connector?

Thanks.

If it's both you should be in.
What scanner did you get?
Does it have a manual online?

tomtom72 · 07-18-2012

I have a snap-on MT2500, it's an old one too. On it the software cartridge you use is what enables the "communication link" to happen. Sometimes I forget and leave in the OBDI stuff when I plug it into my 08 Cobalt.

GOLDCYLON · 07-18-2012

Referring to whats already been posted above. The 95 is indeed an OBDI and OBDII Hybrid. MY 96 was the first OBDII corvette. I think Andrew said that as well.

With this in mind a OBD1/OBD2 scanner should work but you will need either the correct cable, the correct cartridge or the correct mode to be set on your reader/scanner

So lets start over again here. What model scanner or Code reader are you running. Some of us use multiple models and maybe able to help with the setup. I use a Tech 1A or an Auto X-Ray 6000

GOLDCYLON · 07-18-2012

Quote:

Originally Posted by scottfab

Based on what you've posted I found what I think is the manual for it at:

http://buy1.snapon.com/products/diag...Operations.pdf

Does this look like the manual you have?

One quick point of isolation you can do is take the car to an Autozone or O'Rileys and get them to hook up one of theirs to see if the port on you car is ok. Probably not necessary but would guarantee pursuing the MT2500 unit is not wasted. Who knows maybe the port got damages when someone tried shorting some pins?

I do see some posts about updates for the MT2500 but it's not clear to me that you would need these.

Scott. Your confused. Tom has the Snap on Scanner. Not the OP. He has not identified the equipment he is running yet. Which IS part of the problem. GC

GOLDCYLON · 07-18-2012

Quote:

Originally Posted by scottfab

So you're saying the manual I found is wrong? And he would not be using the MT2500 ? Or is there a module he's missing that works together with the MT2500 or wire harness, and therefore the manual I found is correct? You must know the snap-on scanner well?

Scott reread the post. The OP GOFAST has not identified either of his two scanner or readers.

Thats my point Tom is the one with a MT2500 scanner. Your link is for Toms model and not the OPs

Still confused?

Quote:

Originally Posted by scottfab

You must know the snap-on scanner well?

As to this comment Scott why do you consistently feel it necessary to attempt to chide the membership in your posts?

No I do not know the snap on scanner well. As aready stated I know the AutoXray 6000 and the Tech 1-A well.

07-17-2012	#1
GOFAST Join Date: Dec 2011 Location: Minnesota Posts: 31	UNABLE TO SCAN ENGINE CODES I have a '95 with 9000 miles. The "Service Engine Soon" light comes on intermittantly, stays on for a few seconds, and then goes out. I have tried to capture the stored codes using a scanner but the scanner has been unable to connect/communicate with the ECM. Two different scanners have been unable to link/communicate with the host but both work fine on my other car. My '95 has a OCB2 connector. Any idea as to why the scanners can't connect with the ECM? Thanks.

07-17-2012	#2
VetteMed Join Date: Mar 2009 Location: Orlando, FL Posts: 1,828	Re: UNABLE TO SCAN ENGINE CODES 95 has an OBDII connector, but is OBDI. You can't use an OBDII scan tool to talk to the ECM. You need an OBDI scan tool with the OBDII connector. __________________ 2004 Z06/Z16 LeMans Commemorative Edition 1991 ZR-1 #302 White/Gray (sold) 1991 ZR-1 #1147 Red/Saddle (sold)

07-17-2012	#4
GOFAST Join Date: Dec 2011 Location: Minnesota Posts: 31	Re: UNABLE TO SCAN ENGINE CODES My scanner is both OBDI and OBDII compatable. How do I assure the scanner is in OBDI mode with the OBDII connector? Thanks.

07-17-2012	#5
ghlkal Join Date: Jan 2012 Location: Wisconsin Posts: 887	Re: UNABLE TO SCAN ENGINE CODES I know the 95 is a hybrid with OBDI but an OBDII connector. Can you do the earlier OBDI "trick" of connecting pin "12" to pin "4" (I think those are the right connectors on a 95) and turn the ignition on and have the dash display CCM and ECM parameters? http://www.zr1.net/forum/showthread.php?t=17846

07-18-2012	#7
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,645	Re: UNABLE TO SCAN ENGINE CODES I have a snap-on MT2500, it's an old one too. On it the software cartridge you use is what enables the "communication link" to happen. Sometimes I forget and leave in the OBDI stuff when I plug it into my 08 Cobalt. __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

07-18-2012	#8
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,155	Re: UNABLE TO SCAN ENGINE CODES Referring to whats already been posted above. The 95 is indeed an OBDI and OBDII Hybrid. MY 96 was the first OBDII corvette. I think Andrew said that as well. With this in mind a OBD1/OBD2 scanner should work but you will need either the correct cable, the correct cartridge or the correct mode to be set on your reader/scanner So lets start over again here. What model scanner or Code reader are you running. Some of us use multiple models and maybe able to help with the setup. I use a Tech 1A or an Auto X-Ray 6000 __________________ GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V Last edited by GOLDCYLON; 07-18-2012 at 10:24 AM.