GA 97 3.1 is this EGR or CAT problem? GENISYS SPX OTC SCANNER WAS USED

[Aki334]

GA 97 3.1 is this EGR or CAT problem? GENISYS SPX OTC SCANNER WAS USED

I did use different EGR just to test it but I got the same results.
If someone is familiar with this scanner – I need some help
What is wrong with this picture?

STEADY ST CRUS CAT EFF TEST B1
Maximum limit 1135
Measured value 52195
Minimum limit ------
Result Failed
ECU 10

EGR CRUISE TEST
Maximum limit 0
Measured value 65491
Result Failed

EGR DECEL TEST
Maximum limit 2
Measured value 65534
Result Failed

[xeroinfinity]

Sounds like the EGR ports are clogged and giving you a bad reading on the Cat.
Check the wiring around the EGR too .

And I was told the GENISYS syst was supposed to be user friendly,
and easy for anyone to use

[Operator10]

I also used an OTC Genisys Scanner and got the same EGR values: 65491.
Have you fixed your problem? I just installed a new EGR valve and got that values. You may email me if you like at: [email protected]. Thank you, Tommy.

[Aki334]

Tommy I was not able to find solution to this problem. Maybe we have bad cat

[Operator10]

Originally Posted by Aki334

Tommy I was not able to find solution to this problem. Maybe we have bad cat

I installed a new catalytic converter and got the same reading. It's not the cat, it's something else. Thanks for the info, Tommy.

[xeroinfinity]

Originally Posted by xeroinfinity

Sounds like the EGR ports are clogged and giving you a bad reading on the Cat.
Check the wiring around the EGR too .

"I'd start by checking all the wires on the EGR."
Was the engine warm when these tests were ran?

I'd consider trading in that GENISYS scan tool
Does the GENISYS tool even have an exhaust probe?

[Operator10]

Originally Posted by xeroinfinity

"I'd start by checking all the wires on the EGR."
Was the engine warm when these tests were ran?

I'd consider trading in that GENISYS scan tool
Does the GENISYS tool even have an exhaust probe?

I have checked the wiring going to the EGR valve. It checked out OK. No, the Genisys scanner does not have an exhaust probe. I'll keep looking, sooner or later I'll find out what is causing the egr to fail the test. I'll keep you informed. Thanks for your support, Tommy.

[xeroinfinity]

But did you clean the pipe that the EGR sets on ?

If it has any blockage it can throw off the readings.

Whats the readings on the oxygen sen ?

[Operator10]

Originally Posted by xeroinfinity

But did you clean the pipe that the EGR sets on ?

If it has any blockage it can throw off the readings.

Whats the readings on the oxygen sen ?

Yes, I cleaned both pipes really good. I am getting low readings with the 02 sensors. This is also the second set that I purchased. The first set I had purchased had low resistance and voltage readings after using them for about 6 months. So, my thought is something is shorting them out. I checked all the wiring several times and it checked out OK. So now, my thought is, the PCM must be shorted out which is causing these problems. Anyway, I purchased another brand new set of 02 sensors and I'm still getting low voltage readings. This is the last readings I took with my OTC Genisys scanner.
H02S Bank 1 sensor 1v - 0 mv
H02S Bank 2 sensor 1v - 447 mv
H02S Bank 1 sensor 3v - 9mv
I'm currently troubleshooting the PCM. I'm not absolutely positive, but I really feel the PCM is shorted out and causing these problems. I have ordered a new PCM. After I install it, I'll let you know how things turn out. Thank you for your support, Tommy.

[Aki334]

It will be easy with the new pcm if you have that GM PCM programing software on your OTC Genysis. And it is strange that we have exact same reading hmm do not know what to say for that one. What about the other readings that I mentioned above are they close to same? Tell us what engine you have year etc. I can unplug my b1 O2 and measure resistance with engine off and on at the O2 connector that goes to pcm so we can compare the readings that will probably work if you have 96-97-98 3.1l I think and that will probably tell you if you have bad pcm I am not very sure but we can try.
Try also finding wiring diagram for your pcm connectors and see where your b1o2 and b2o2 wires connect to your pcm, unplug your pcm connectors and measure resistances for each wire should be very close to 0 ohms, also clean all your grounds on a car.

[Operator10]

Originally Posted by Aki334

It will be easy with the new pcm if you have that GM PCM programing software on your OTC Genysis. And it is strange that we have exact same reading hmm do not know what to say for that one. What about the other readings that I mentioned above are they close to same? Tell us what engine you have year etc. I can unplug my b1 O2 and measure resistance with engine off and on at the O2 connector that goes to pcm so we can compare the readings that will probably work if you have 96-97-98 3.1l I think and that will probably tell you if you have bad pcm I am not very sure but we can try.
Try also finding wiring diagram for your pcm connectors and see where your b1o2 and b2o2 wires connect to your pcm, unplug your pcm connectors and measure resistances for each wire should be very close to 0 ohms, also clean all your grounds on a car.

The engine is from a 98 Camaro. It is a 3.8 V-6 with a 4L60E transmission. I did unplug the PCM wire connectors and the sensor wire connectors and took continuity readings to make sure that the wires went to the right pins. They checked out OK. With the PCM connectors hooked up and the sensor connectors disconnected, I took voltage readings between the C and D terminals. The voltage was 12.14 for two of the wires and 12.13 for the other. The ohms readings between the C and D terminals of the sensors were 5.3ohms for one of them, 5.4 ohms for another and 5.7 ohms for the 3rd. I can't see the problem being with the 02 sensors. I'm almost certain it is in the PCM. If you have not checked out the website where my project is posted, you can do so by clicking on this link:
http://ptcruiserworld.tenmagazines.c...ry.ten?id=3504 I have well over 130 pictures with documentation under each picture. Be sure to click on each picture to make them larger. There you will see all of the problems that I have encountered from the start of the project up till now. There have been alot, and I have fixed each problem one by one. However, this one remains to be the most difficult. I don't think the Genisys is capable of programming the PCM, at least not the model that I have. Really not sure, I'm just starting to learn how to use it. It will be able to do a Case Learn procedure that I must get done. Are you familiar with that procedure? As far as the other readings for the EGR, I need to look for my notes on that. I'll get back to you with those readings. Thank you, Tommy.

[Aki334]

people say a picture is worth 1000 words, your 130+ pictures is a library of words - I saw your pictures and hard work (very nice) there is probably nothing that I can tell you what to try Tommy. You have time, space, will experience and $$$ to try what every you wish all I can say is good luck in finding this solution for us I gave up, but at least I know that I do not need new cat . If you have that color screen otc scanner you can upgrade it so it can test emissions too. http://www.clubgp.com/cgi-asp/mods.asp?modid=48 maybe this can help you for case learn procedure. I never did it but is does not look too hard. If you see any changes in values after new PCM please let me know. [email protected]

[Operator10]

Originally Posted by Aki334

people say a picture is worth 1000 words, your 130+ pictures is a library of words - I saw your pictures and hard work (very nice) there is probably nothing that I can tell you what to try Tommy. You have time, space, will experience and $$$ to try what every you wish all I can say is good luck in finding this solution for us I gave up, but at least I know that I do not need new cat . If you have that color screen otc scanner you can upgrade it so it can test emissions too. http://www.clubgp.com/cgi-asp/mods.asp?modid=48 maybe this can help you for case learn procedure. I never did it but is does not look too hard. If you see any changes in values after new PCM please let me know. [email protected]

Yes, the scanner that I have is the OT3454R06 2006 Genysis Refurb with Smart Cable Asian/Domestic. It can do alot. It is able to test the emission system as well. Just learning how to use it is the hard part. I just now had the engine running with the scanner hooked up. All the evap systems passed the test. It's just the EGR that is not passing for some reason. I really need to double check the wiring from the EGR to where ever it goes to, to see if there is a short. Again, I have a gut feeling that the problems I'm having with the EGR and 02 sensor systems are because of the PCM. I had a company fabricate my engine harness for my application. So far, since I started up the engine for the first time, I have found 3 electrical systems with wires crossed. I have made the necessary corrections, however, I believe because of these crossed wires, various systems inside the PCM have probably shorted out. I have checked and rechecked all of the wire on the harness several times. Infact with the PCM wire connectors disconnect as well as the 02 sensor wire connectors, I just now checked the resistance for each of the wires that run from the PCM to the sensors. Nothing, no resistance reading at all. Thanks for the info on the Case Learn. Before I can do that procedure, I need to clear the P0300 code that is setting. I also got the EGR readings you were interested in. Here there are:

EGR Cruiser Test
Maximum limit 1
Measured value 65491
Minimum limit ---
Result Failed
ECU ID 10

EGR DECEL TEST
Maximum limit 1
Measured value 65491
Minimum limit ---
Result Failed
ECU ID 10

Hope this helps. I'll keep you posted of my progress. Thank you all for your support. I really appreciate your help, Tommy.

[Aki334]

I have the same problem Tommy with the pending code p0300. I see misfires on #3 and #4 cylinder. I am sure we have the exact same problem. But one quick question if there is problem with the EGR circuit why don't we have DTC set?, if there is problem with the same circuit how come I can do a test on EGR through PCM and order opening and closing the EGR pintle you can try this on your scanner under special tests. So far the closest I got to stop my misfires was disconnecting MAF sensor that is according to original GM service manual. Manual said if you disconnect MAF and misfires stop replace MAF I did disconnect it and misfires were gonne but when I put in the new MAF the same thing happened. This tells me we have some unmetered air comming in somewhere. Did you do vacuum gauge reading on your intakemanifold? This problem I had for a long time and I was never able to fix it. Hopefully once you get that new pcm I will know if I need to do the same thing. I was thinking to replace all my injectors because of the p0300 but I will wait for this now (I assume you have clean injectors). Back to EGR did you try takaing off the EGR and plugging those EGR openings on manifold with aluminum foil just to see if misfires stop. I am also thinking that this could be problem with one of the valves onot opening or closing properly or bad MAP reading.

[xeroinfinity]

Cheap o2 sensors dont last ling, you get what you pay for.
btw Bosch O2's are crap!

Originally Posted by Aki334

So far the closest I got to stop my misfires was disconnecting MAF sensor that is according to original GM service manual. Manual said if you disconnect MAF and misfires stop replace MAF I did disconnect it and misfires were gonne but when I put in the new MAF the same thing happened.

I've never seen that in any of my GM tech manuals.
The car should die when the MAF is disconected.

I think your guys problem, is the scan tool
Or you both have a Bad PCM/ECU, this shouldnt be that much of a mystery to solve....

Maybe you two should test the circuits with a volt/ohm meter, not that GENISYS scann tool.