Finishing LS1 swap and run into trouble

[chimaera]

Hello everyone,

I'm doing a swap of LS1 from 02 Camaro into 240Z and have run into problem with PCM not enabling fuel pump relay.
I have had the PCM reprogrammed to delete VATS, fuel presure sensor, AC and couple other items.

When I crank it does produce spark so I know that the PCM is operatinal I'm just stumped on the fuel pump, the relay does not seem to be engaging. Looking at diagram of engine wiring from 00 SS vin G makes me bit confused. Normally dark_green/white should be coming from PCM red connector pin 9 to the relay. But when I look at the wires at the PCM red connector in its place there is pink/black wire.

Have not opened up the harness yet to have it traced back, but was there special wiring for 02 SS or is there alternative PCM pinout for it.

This is my stopping point before I can crank it over and hear her run.

Hoping for some comments and sugestions, and possibly wiring diagram for 02 SS if there is a special one.


Thanks in advance for all comments.

[crainholio]

The fuel pump relay is operated differently than the fan relays...the PCM sends 12VDC to pull the relay closed. Whereas the PCM grounds the fan relays, just the opposite.

How do you have your fuel pump relay wired?

[chimaera]

Used original engine/bay harness just removed all unnecessary AC and misc stuff.

one side og relay coil goes to ground the other goes to the dark_green/white wire from PCM.

I'm confused on the color wire on the PCM connector side. according to the diagram it has pink/black wire on the fuel pump pin.

[LS1MCSS]

99-02 f-bodies had a dark green/white on C2, pin 9. That's the fuel pump wire. If yours doesn't match, are you sure it's that year harness?

[crainholio]

Originally Posted by chimaera

one side og relay coil goes to ground the other goes to the dark_green/white wire from PCM.

And where do the other three relay wires go?

[can'tfindausername]

Ohm that wire to the pin it's supposed to be in. I'm not sure why the colors would be different, but ohming it would be a quick way to determine if you have it hooked up correctly.

[chimaera]

Originally Posted by LS1MCSS

99-02 f-bodies had a dark green/white on C2, pin 9. That's the fuel pump wire. If yours doesn't match, are you sure it's that year harness?

picked up the engine from salvage yard and seen it being pulled so its definetaly 02 ss.

just need to know if the PCM is same for other years and if so then wire color will not make difference

[chimaera]

Originally Posted by crainholio

And where do the other three relay wires go?

other side of relay coil goes to groung terminal 30 on relay goes to fuse and 87a goes to pump

theoretically it should work just confused of the wirev color differences.

will have to do continuilty check from pcm to relay

[the_merv]

^^Your first sentence is confusing..you are right, it's just confusing..lol


Here is how it should go chimaera..

Red PCM Connector Pin #9 to Relay Pin #86
Ground Relay Pin #85
Battery Power to Relay Pin #30
Fuel Pump to Relay Pin #87a

Check that the Red PCM #9 goes where it needs to go, and is Green/White, and goes 12v hot when you turn on the Key.

Originally Posted by chimaera

one side og relay coil goes to ground the other goes to the dark_green/white wire from PCM.

Where does this Green/White wire go in the PCM?

Here is a link that will help you..

http://www.ls2.com/boggs/torques/2002pcm.htm

[cheif]

could be the relay is a dud, hot wire the switching side and see if it fires up the pump. If that works you know it's not wired right and since the pump is now running you might as well fire up the motor and hear how it sounds. I know that's the biggest part I'm looking forward to.

[LS1MCSS]

That should be pin 87, instead of 87A. 87A is normally closed when the relay isn't energized.

Originally Posted by the_merv

^^Your first sentence is confusing..you are right, it's just confusing..lol


Here is how it should go chimaera..

Red PCM Connector Pin #9 to Relay Pin #86
Ground Relay Pin #85
Battery Power to Relay Pin #30
Fuel Pump to Relay Pin #87a

Check that the Red PCM #9 goes where it needs to go, and is Green/White, and goes 12v hot when you turn on the Key.



Where does this Green/White wire go in the PCM?

Here is a link that will help you..

http://www.ls2.com/boggs/torques/2002pcm.htm

[chimaera]

This is how its all wired on the relay. The funny part of it is that pin 9 on C2 is pink/black

Going to garage now and ripping the harness apart to see where the pink/black dark green/white wires are going to.

Originally Posted by the_merv

^^Your first sentence is confusing..you are right, it's just confusing..lol


Here is how it should go chimaera..

Red PCM Connector Pin #9 to Relay Pin #86
Ground Relay Pin #85
Battery Power to Relay Pin #30
Fuel Pump to Relay Pin #87a

Check that the Red PCM #9 goes where it needs to go, and is Green/White, and goes 12v hot when you turn on the Key.



Where does this Green/White wire go in the PCM?

Here is a link that will help you..

http://www.ls2.com/boggs/torques/2002pcm.htm

[the_merv]

Originally Posted by LS1MCSS

That should be pin 87, instead of 87A. 87A is normally closed when the relay isn't energized.

Yea..that's right. I got confused with his 87a.

87 is the post you want that on Chimaera..that is the one that you will have power on when the Relay energizes. If you put it to 87a then the Pump will run when the key is in the off position if it's powered from the Battery.

That would be wierd..lol

[chimaera]

OK there is something funny with my harness or its not from 02 SS or it has custom pinout.

pin 9 from C2 (red) pink/blak wire goes far into the engine harness
dark green/white goes into pin 37 on C2 (blue)

I know its late, but I'm not dreaming. I think I should be looking into new harness or rewiring it to what it supposed to be.

[LS1MCSS]

Originally Posted by chimaera

OK there is something funny with my harness or its not from 02 SS or it has custom pinout.

pin 9 from C2 (red) pink/blak wire goes far into the engine harness
dark green/white goes into pin 39 on C2 which is 12v reference

I know its late, but I'm not dreaming. I think I should be looking into new harness or rewiring it to what it supposed to be.

Find the pinouts for a 98 harness and see if the colors match what you have.

[ssduane]

Originally Posted by chimaera

OK there is something funny with my harness or its not from 02 SS or it has custom pinout.

pin 9 from C2 (red) pink/blak wire goes far into the engine harness
dark green/white goes into pin 39 on C2 which is 12v reference

I know its late, but I'm not dreaming. I think I should be looking into new harness or rewiring it to what it supposed to be.

Dude, you got a 98 harness, ask me how I know. Same thing happened to me.

I got a 00 engine, a 98 PCM and 98 harness, and I was stumped why shit wouldn't work. The pink black wire is a injector wire, not a fuel pump relay wire. Don't think you hurt anything by powering stuff up either, after I got a new PCM (01) and wired the 98 harness up to it all worked good. Your just going to have to open up the harness and repin it to match the PCM.

Next question, what does your PCM look like, does it have fins all around it? If so its a 98, 99 and up have fins on one side just on the ends and a removable plate on the other side.

FYI, once you do get it all un-f&*ked, the fuel pump relay will only energize after the key is one for 3 seconds, to prime the fuel system and will reenergize once the engine is started.

[the_merv]

Here Chimaera..

http://www.ls2.com/boggs/torques/98pinpcm.htm

You are describing a 1998 Harness.. the FP Relay Wire is Blue #37.


Once you get it lined out the 1998's are easier to work with..there are better wires in the Harness for older style stuff.

If you want to, switch it around to make it a 1999-up, that will give you better PCM Tuning Capabilities.

[chimaera]

after ripping and tracing couple of those wires yesterday at 1am I gave up I was bit p*ssed off.

Printed the 98 pinout, you guys are 100% correct it is pinned for 98. Not bit funny after spending couple of weeks on this, someones' joke or messup gave me few more gray hairs

I have couple more questions then.

Besides power, EGR and some polution control what deifferences are between 98 and 02?

For now I will be happy with what I can get out of it and go for a spin but tunability of 99+ will be of benefit to me later on as I like to get some more power of of the engine.

How can I tell that the engine is from 02 SS. Are there specific marks on the block or can I tell it by serial #?

Now with the PCM. On one side of the PCM there are 2 sets of fins 2 per side. On the other side there is a cover plate with 4 screws holding it with label on it
serv.no. 12200411 DJZX
*86djzx9112753naw* 12206911
hdw no. 09386530
Not sure if there is a way to reference it if its 98 or 02 PCM
I dont know how to post pic so here are links to couple pics
http://www.nexustech.ca/240z/misc/20...13%20PCM-1.JPG
http://www.nexustech.ca/240z/misc/20...13%20PCM-2.JPG

I thought I had DUD for PCM so I have another one comming in. Would like to have confirmation on the PCM vintage. I'll see if I can locate 02 engine harness insalvage yards but if I cant find it I'm going to re-pin the PCM connectors as the_merv and ssduane sugested. Just hope that sensors and everything else will be compatible.

thanks guys for the help so far.

[ssduane]

well its not a 98 PCM, thats for sure, 98s will have fins all aorund it, so you got lucky, the VIN is the number in astericks, 10th digit 2 is 02, so looks like you got lucky with a 02 PCM, I'm not too sure on engine ID, but you did say you saw it beiing pulled.

[ssduane]

98 PCM http://cgi.ebay.com/ebaymotors/1998-...=p4506.c0.m245