Since there isn't a Scan and Tune section in C6, I'll throw this out here.

2005 C6 with E-40 ECM

I want to connect a wideband 02 that will stay in the car permanently and be used for tuning with HP Tuners.

I am looking for an unused pinout on the ECM that reads 0-5v. I am aware of the A/C high pressure, but it has to be switched back and forth. My 2000 C-5 is done this way and, in my opinion, it is the best way to tune. Just plug into the OBD II port and go.

There is an EGR Position parameter that can be scanned in the Table Display which, of course, always shows no voltage. If it was not available it would show <unsupported parameter>, correct? In the custom parameters, there are two EGR Position, [PID.2810] and [PID.2811]. So, all of the necessary information is there, except which pinout on the ECM is the EGR Position.

The pinout was easy to find out on the 2000 model, since the Camaro used the same engine and PCM, and had EGR. The E-40 ECM is also used in the following vehicles:

-Buick Rainier
-Chevrolet SSR
-Chevrolet Trailblazer
-GMC Envoy
-Isuzu Ascender
-Pontiac GTO
-Saab 9-7x ARC

I checked the pinouts on all these vehicles, except for the Saab (I don't have access to the Saab pinouts), and found no EGR. Does anyone know which pinout that HP Tuner is getting this reading from or how I can find out? I really don't think it is safe to start putting a small voltage on the unused ECM pinouts until I see voltage on the Table Display.

 

Erm, there is a Scan and Tune section in C6... It is right here:

http://forums.corvetteforum.com/forumdisplay.php?f=124


Plus, HP Tuners has the option to datalog wideband O2s as inputed directly into it, so I'mnt sure what you are trying to accomplish?

 

Only if you have the PRO version. Also if you are using the EGR input, make sure the EGR is enabled in the tune.

 

Well, how about that. If you use the red bar towards the top of the page with the drop down lists, it doesn't show up. Thanks.



With this setup I can leave the controller and gauge in permanently and log with my HP Tuners by just connecting to the OBD II port. No extra wires, no extra connections. I have my 2000 model connected this way.

 

The EGR enable is under General for the C5, but there isn't an EGR enable in the C6 tune. I am still able to put it in the Table Display and get a reading (0.00).

If there wasn't an actual pinout for this wouldn't I get <unsupported parameter> instead of an actual reading?

 

A friend told me to get the PRO version. Glad I did. I makes it SO easy to log. In fact, at one time I had both my wideband hooked up and a sound level meter. Made for a neat log.

 

Here's your answer if you can't get EGR to work (saw a few folks who tried, didn't seem they succeeded) - the AC pressure switch will work:

http://forums.corvetteforum.com/show....php?t=1705471

Just did it myself. Be sure and read my posts for a couple of clarifications on the top posts to make it work.

I used a dual in one out rocker switch to control what input the computer gets - either the ac switch or the wideband. You can't use your ac while tuning, if pressure gets too high it will bleed off r134 and you'll have to get it refilled.

 

I'm aware of the A/C high pressure, I actually wrote that sticky with 95BlueBomber (see post #5). I'm really trying to get some feedback on whether I'm thinking right.

Here is a breakdown:

-I can enter EGR Position in Table Display and get a reading of 0.00

-If I am getting a reading, then this pinout should exist or I would get the <unsupported parameter>, correct?

-In the Custom Parameters the EGR Position is listed as [PID.2810] and [PID.2811]

This is all the necessary information needed to create a custom PID for reading the wideband through HP Tuners, except for the ECM pinout. I realize there are other ways of doing this, but I want to be able to just connect to the OBD II port and start logging, no wires, no switches, etc. I'm just the kind of person that, if it can be done, I will figure out a way to do it, so all feedback is welcome.

 

I think you are correct since you are getting the 0.00 reading. Before I figured out to track the ac pressure in the table I was getting the unsupported parameter message when trying to log afr.

I didn't realize you were one of the guys on that thread. That thread helped me and several of my buddies, so thanks!

 

It would be great if we could not mess with the A/C. The thread seas to have faded away; but was thinking someone may have figured it out.

 

 

Anyone able to get a wideband going through the EGR input?..





D

 

There is no EGR pin on the E40 PCM and I would venture to say it does not exist on the later model PCMs either.