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Old 11-11-2004, 08:35 PM
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94 grand am computer

I have a 94 grand am and i think i fried the computer putting in a remote starter. Is there a way to verify this, or perhaps there is a fuse or fuse link I'm over looking. Thanks

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Old 11-11-2004, 08:42 PM
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Does the check engine light flash code 12 when a - b in the dlc is grounded? If not could be a bad computer.
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Old 11-11-2004, 08:56 PM
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how do I do this, ground a and b and watch the light ??

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Old 11-11-2004, 08:58 PM
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Ground a to b and watch the check engine light for flashing. A code 12 will be a flash, pause followed by two quick flashes.
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Old 11-11-2004, 09:27 PM
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I cannot really see what is what, there are three active pins, on the right side, one on top, two on the bottom. I tried the two on the bottom, didnt get no responce. should the key be on when I ground them or should I turn the key on after I ground them ?

Thanks again

I was checking to see if I had the right start wire (12 volts when in the start position), and I had the wires going to the computer by mistake. I had a multimeter hooked up to it, the yellow wire going to the computer, and the neg side of the meter to the battery. Don't understand how I could have fried the computer like this, i mean i understand static discharge, but I figure I was grounded.

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Old 11-13-2004, 09:08 PM
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Yes, key on ground A - B and look for the service engine light to flash.
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Old 11-13-2004, 11:03 PM
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I get nothing at all from doing this. Here's what happend. I was checking a wire for voltage, on the ignition moduale harness, and plugged it back in and the car would not start back up. I checked the pins to make shure they were not broken or bent. I replaced the computer, that did nothing, it starts with starting fluid, then dies out. I need to check the injectors, but I don't know where the main electrical connector is. The fuel pump comes on, but I havent found a check valve for the fuel rail, so I havent verified the pressure yet. I'm assuming that if, I can verify that the computer is sending a pulse to the injectors, and I have fuel pressure, then someone must of put a hex on me.




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Allen
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Old 11-14-2004, 09:54 AM
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Quote:
Originally posted by cleanalby
... it starts with starting fluid, then dies out...
This sounds familiar don't you think, Advance Design?

Allen, when you installed your remote start, did you bypass the VATS (Vehicle Anti Theft System)? Without starting fluid, does the car start and run for a second or so and then die?
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Old 11-14-2004, 10:31 AM
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I've been thinking this could be alarm related, no I haven't.

Thanks again
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Old 11-14-2004, 11:39 AM
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So your VATS hasn't been messed with? If I read you right, the only things you've done is disconnect the harness at the column, test for voltage and then reconnect th harness, right?

Just to clarify - will your car start and run for 1 second on it's own without starting fluid?

Advance Design helped me a LOT with a VATS and crank sensor problem on a transplanted 3800. From what I understand about the VATS, the key is inserted and the resistance in the pellet is read by the VATS module. I assume that connection is part of the column harness you unplugged. The VATS sends a signal to the ECM and the ECM will run the engine.

From my experience with VATS problems, the ECM will give a priming shot of fuel as the engine is cranked over. The ignition module handles all the spark based on signals from the crank sensor and will fire the engine with that initial fuel supply. If there is no VATS signal , the ECM will not pick up on firing the injectors after that initial fuel shot is burned so the engine will die. That's where I was stuck for a long time. http://gmtuners.com/ can remove the VATS from your PROM for a great price.

Hope that helps.
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Old 11-14-2004, 12:18 PM
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It doesn't start at all without starting fluid. Is there a way to check the fuel pressure without disconnecting the fuel rail
. Would you know where the connection is to check the fuel injectors pulse ??

Thanks
Allen
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Old 11-14-2004, 12:36 PM
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Stinkin_V8 -

Yep, sounds familiar and glad the Fiero is up and running. We were a good team on that issue. Concerned that this ECM will not flash a code 12 and suprised it would start on starting fluid.

Cleanalby -

Is this a 3.8L?

How did you check the wire you described for voltage? Did you probe the terminal with a voltmeter lead? If so the terminal could be over stretched and not making contact with the module pin. The pressure port on the fuel rail would be near the pressure regulator. You must use a proper fuel pressure gauge to check pressure. Don't want any injuries nor thermal events. If you are not sure please seek professional help.
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Old 11-14-2004, 12:44 PM
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Here is some pics of the car. Again it does not start at all with out starting fluid, when I get home I'll send ya the engine info.

Thanks


http://brionanet.com/humility/allen/..._grand_am.html

ps, I know that the pic labeled this is under the ign mod is the oil sending unit.
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Old 11-14-2004, 12:50 PM
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That looks to be a Quad 4 which I am pretty rusty on.
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Old 11-14-2004, 01:43 PM
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OK, thanks anyway.
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