swapped harness from 1.5 to obd2 car wont start help !!

[beretta777]

Ok I did the obd2 swap from a 96 Beretta donor car into my 94. Swapped everything with it so far besides the com port to tune or scan. Plugged everything in correctly. Car wont start I have spark I have fuel at the fuel rail at the test valve but spark plugs are dry. Car will run with dumping gas down the tb until it runs out. This is a race car so I have a fuel cell in the back seat with a inline high pressure pump wired to a switch. Could it be because I don't have the fuel pump plug plugged into the harness?? Never was a problem on my 94 but I am stumped. Help any ideas would be great thanks.

[speedy]

im not sure what the problem is, but may i ask you a question? why in the hell would you put obd2 on a race car???

[3X00-Modified]

Sounds like its not firing the injectors... Without a way to scan the ECU there is no way to tell what's going on.

Wire a com port to this plug with these wire colors as stated in the directions I posted.


Com port wires are as follows, going from the com port to the rectangle body harness pictured just above this.

Wire color from com plug to - Pin on Body harness
B/W - Tap to Pin D on the rectangle body harness (Engine bay side of this plug)
Purple - Tap to Pin E on the rectangle body harness
Tan - Tap to Pin F on the rectangle body harness

Then pull 12v power and ground for the com plug from anywhere.
Orange - to any 12V constant source
Black - Any Ground

[beretta777]

I swapped the harness to tune the car a guy that lives by me has a dyno in his garage and can tune it. But had to be obd2.

[3X00-Modified]

Does his OBDII suite support the 96 Beretta? Odds are unless he has DHP the answer to that is no, so you will have to swap to a 97 Monte Carlo ecu and make some other changes, especially if he has HPTuners.

[Slinky]

I hate to ask but did you check the fuses?

[beretta777]

No it didn't work on the 96 ecu but we tried swapping in a 97 Lumina ecu I had laying around and he could gain access and work with that one. Also I did check the fuses.

[Rettax3]

Sounds like injectors aren't firing, I say, stating the obvious. If it fires then dies, that is likely the anti-theft system in the PCM, you would need a Pass Key module with correct resistor or chip-key, or possibly someone still makes a square-wave imitator, I don't know. But if the injectors won't fire at all, check all grounds, all ignition power AND battery constant-hot power sources into the PCM. If you are running with a different PCM, also make sure you have the harness pinned correctly for THAT PCM, not necessarily the '96 Beretta. Also check the harness into the injectors themselves to be sure they have power. Lastly, check all the connections into the ICM, although since you have spark that is probably fine, just be sure the connector that feeds the PCM is hooked up right and has continuity on all wires -the car will not run without that despite having the CMP and Hi-Res CKP (Cam and 24x Crank Position Sensors).

Having the fuel-pump wired in separately will not matter, so long as it is actually running and producing the correct pressure. Good luck.

[3X00-Modified]

97 should not have come with passkey... but it would be wise to double check the setting in the ECU to ensure it's not enabled.

[Rettax3]

97 should not have come with passkey...

Okay. I don't know for sure about a '97 3100 PCM, but the PCM running the 3800 SC in my GTU is from a '97 Bonneville SSEi and has Pass Key II so the year is right, but that is the 'dinosaur' 3800 too... I worked with a '94 Grand Prix 3100 PCM (IIRC) that also used Pass Key... PITA to bypass that one without a programmer. And the '99 GA PCM that was running the 3.4 in my '90 turbo has anti-theft too, different from Pass Key (it became unreliable because of the anti-theft, so I swapped it out with a 3400 PCM from a Chevy Venture), but it does the same fuel-injector-kill.

If the car won't fire at all, it is probably not an anti-theft issue though.

[3X00-Modified]

It still could be anti theft. He needs to check the codes that are enabled and the passkey section of the bin. I know on a 97 venture file the passkey is fully disabled by default, anything else is up in the air because as you noted GM was all over on which cars got it.

This is a process outlined for HPTuners...

http://www.hptuners.com/forum/showthrea ... hlight=pwm

I've done this on my moms old 2000 Grand AM when it continued to screw up, except the procedure was slightly different in DHP. And I think that was labled as passkey enabled or disabled, not VATS and set to PWM, but I'm not sure. You set the system to "disabled" then have to shut off codes otherwise it will only let the car run for a second, or just crank.

[Luckymc420]

Can you just flash the PCM with something else?

[3X00-Modified]

What do you mean something else?

[beretta777]

ok guys here where I am at hooked up a scanner and scanner says no link so wont read the computer idk why. But we hooked up a light on the injectors wires and they are not pulsing or blinking. I have power to all them but no ground. Ok so I poked around the ecu plugs with a test light to see if there was power there and when I was doing this I found the one what would normally ground that injector out and the light that we put on the injector plug lit up. So this is telling me I have a ground issue correct??

[beretta777]

I also would like to add before I did the swap from the 96 harness into the 94 the 96 beretta ran with the 97 lumina ecu plugged in.