Convert 98 to 02

[ChipsByAl]

I have some information regarding the 1998 F-car to 1999-2002 PCM harness swap. This is a document that can help significantly.
Al

http://www.chipsbyal.com/convert98a/Convert98a.doc (http://www.chipsbyal.com/convert98/Convert98a.doc)

[Doc]

Nice document Al. I didn't have time to go over everything but, how did you address the fuel gage?

[ChipsByAl]

I used the 2002 Camaro/Firebird OS 12212156 (available from http://www.tunefiledepot.com/) for the base file. I then used the fuel segment from the 2002 Express Van OS 12212156. Since the fuel tank and sender are different, I then copied the fuel system parameters, fuel gauge calibration and Convert sender to volume tables back from the Camaro/Firebird base file. I just looked and Tordne doesn't have the Express Van on his site. I will email him one.
Al

[ChipsByAl]

This is the Express Van file from Tordne's site.

http://www.tunefiledepot.com/calibrations/stock/Chevrolet/2002%20Chevrolet%20Express%20Van%20Automatic%20L31 %205.7%20Litre%20(12212156).tun

[Doc]

That is really cool. You are the man. That will really cut down on the swap time and funds to do it. I hope all the prospective 98 owners out there are paying attention to this monumental advancement-the segment swap. So, allright you know who you folks are who balked at the idea of swapping the cluster and tank/sender are...get to it! You have no reason now not to enjoy the fruits of the Custom OS's. Paul and Ross et all worked really hard to give you people this stuff for free-pay them the respect and run it and tell them how much you really enjoy it- I am so thankful,
:master:

Being the hard head that I am though I probably still would have gone the long hard way I went again just because I love re-wiring stuff and turning wrenches.

[1998ws6]

Very cool, I figured there would be a segment that would allow for the PWM fuel gauge to continue to work on the 98 cluster. You just saved me hours of work, I appreciate it.

Ryan

[roy]

Yep , Iam paying close attention.

[Garry]

Would you mind if I added this info to the Wiki @ GMTuning.info? (I'll keep the (C) in ...)

[Garry]

When you write "Red C1-60 BRN, Blue C2-19 PNK, C2-58 PPL and C2-20 ORN remain in the same locations" - does that mean they stay in the original connector, so C1-60 -> C2-60, both being red, or does it mean, C1-60 remains C1-60, but effectively moving from red to blue connector?

[Tordne]

I have a copy of the Express Van tun file here till Tordne can host it.

http://www.chipsbyal.com/convert98/L02Gra1_0000.tun

Got this and another couple of tunes put up today - finally...

Cheers,

[ChipsByAl]

Yes Garry you can add the information to the Wiki.

When you write "Red C1-60 BRN, Blue C2-19 PNK, C2-58 PPL and C2-20 ORN remain in the same locations"
This means you don't have to do anything with these circuits. See the excel file for the "new" circuit location.

[Garry]

OK, understood ... I added the pins to the table I made in the Wiki, so anybody just doing pin by pin should get it right ;)

[jnorris]

This is great news! What about the ECT gauge?

[edit]
Never mind....It will operate the same as it will still use the same sender and gauge cluster....

[jnorris]

OK, understood ... I added the pins to the table I made in the Wiki, so anybody just doing pin by pin should get it right ;)

I am sorry but I do not understand "Wiki". :redface:

How do I fine the table you are talking about?


John

[jnorris]

I used the 2002 Camaro/Firebird OS 12212156 (available from http://www.holdencrazy.com) for the base file. I then used the fuel segment from the 2002 Express Van OS 12212156. Since the fuel tank and sender are different, I then copied the fuel system parameters, fuel gauge calibration and Convert sender to volume tables back from the Camaro/Firebird base file. I just looked and Tordne doesn't have the Express Van on his site. I will email him one.
Al

The 1998 F-body fuel tank holds 15.5 and the 99+ hold 16.8 gallons. Shouldn’t you use the stock 1998 calibration data in the 2002 flash?

[Garry]

I am sorry but I do not understand "Wiki". :redface:

How do I fine the table you are talking about?

http://gmtuning.info/wiki/index.php/98PCM

[jnorris]

http://gmtuning.info/wiki/index.php/98PCM

Thanks

[ChipsByAl]

The 1998 F-body fuel tank holds 15.5 and the 99+ hold 16.8 gallons. Shouldn’t you use the stock 1998 calibration data in the 2002 flash?

Good point, jnorris. The conversions I did were close enough just like that. You can definitely fine tune the fuel gauge better than my rough in.
Al

[Brains]

Wow, this is awesome! :cheers: :master:


What is meant by "TEST FIRST!" on that one pin though?

[ChipsByAl]

Sorry if I confused anyone. That was a note to me to check that circuit. It does work with the segment swap and update of Camaro/Firebird fuel parameters. I have changed the document for all who want the corrected version.
Al

[ChipsByAl]

This is the link. The upload doesn't seem to want to work.
Al

http://www.chipsbyal.com/convert98/

[Brains]

Thanks Al, this is awesome :)

[hquick]

Hi guys,
I'm trying to calibrate my guage in my truck after installing the 0411 PCM. Do you guys know how to do that?
I have a 159L tank and can't figure out how to set it up.
I was on 1/4 tank and just filled up. I put 130L in which means there was only 29L in there...not 1/4 tank which would be closer to 40L.

[ChipsByAl]

I was on 1/4 tank and just filled up. I put 130L in which means there was only 29L in there...not 1/4 tank which would be closer to 40L.

I have some questions. You were on 1/4 tank before you added the fuel, correct? It is not currently reading 1/4 tank with a full tank, correct? So it should have read somewhere around 20% on the gauge before you added fuel. GM fuel gauges are notorious for not being accurate, but generally they err on the low side. You should have been reading almost empty before you filled up. Can you post your tun file or email it to me? Do you have a roadrunner, makes quick work of getting it dialed in?
AL

[hquick]

Thanks for the help AL.
Yeah...the guage was reading 1/4 but the tank must have only had around 29L in it as I put 130L in.

Forgot to ad....the guage was always fairly accurate before this. Seems I'm the only person around with the 159L tank.
Sorry, early morning here lol No, it doesn't read 1/4 tank with a full tank. It reads off the scale full for quite a while before moving.

[hquick]

Did you see anything in my tune o help me with my fuel tank/guage Al?

Thanks

[ChipsByAl]

This is just my opinion but I would start with checking your F0507 table with the scan tool and make sure it is accurate with the known fuel quantity in the tank. Pumping it dry when it is close to empty will show the bottom value of the sender. Once this table is pretty accurate you can use F0501 to fine tune the output of the PCM to the cluster. You will have data showing one thing in the scan tool and then make the cluster match or undercut the scan tool, ie. for a reserve. Generally GM fuel gauges stay in the full range for quite some time and then quickly go down. In other words not too linear to what is in the tank.
Al

[hquick]

Thanks Al, I may play a little with your recommendations.

[zapp168]

:master: Thank you ChipsByAl, and Flanders (from another board) for all the hard work on the pinouts! I used both pinouts and it worked real well. The fuel gauge kept messing me up, but it is getting closer.
As a note on the "skip shift light", I am not sure if it would work as it's intended purpose, but I put RED C1 WHT to RED C1 47 as per another post and the light works, I am using it as a shift light now though. THANKS AGAIN!

[ChipsByAl]

I'm glad that I could be of help. What is the problem with the fuel gauge?

[zapp168]

I'm glad that I could be of help. What is the problem with the fuel gauge?

I tried to copy the segment from the van, but that did not seem to work until I did a full reflash. It read backwards initially, so I reversed the numbers on the gauge calibration. Any other issues were a combo of a wire off in the harness (me) and trying to make it more accurate EX: changing the fuel tank size, using the 98 calibrations.

[ChipsByAl]

Hey guys, JNORRIS located an error in my Convert98a.doc for this conversion. It involves a jumper wire from one connector of the 1998 PCM to the other. This jumper can be removed. The first document had a typo on line 35. It has now been corrected on my web site. I apologize for any inconveniences it may have caused. If you have one end of this wire still in your Blue connector terminal 35 you can safely remove it or keep it from harms way.
Al

PS. I have also enclosed the new file.

[joecar]

Al, thanks for the update. :cheers: