im pretty sure my fan came on when i shorted A & B on my aldl on my last ratsnest harness merlot made. and i swear i read somewhere when shorting the terminals, the fan comes on to tell you your doing it right.
im pretty sure my fan came on when i shorted A & B on my aldl on my last ratsnest harness merlot made. and i swear i read somewhere when shorting the terminals, the fan comes on to tell you your doing it right.
Shorting A and B terminals together on the ALDL connector puts the ECM into diagnostic mode. On most OBD-1 cars with computer-controlled cooling fans, this turns the fan(s) on and does some other things with various outputs (as well as flashes the trouble codes thru the check engine light if the engine is not running). If your fan is not coming on when you do this, then you probably don't have something wired up correctly or there is still an electrical problem.
From what you have been describing about the problems you are having, I would have to say something isn't right in the wiring. OR at some point something wasn't right with the wiring and the ECM got fried (and maybe some other components). You may have since fixed the wiring issues, but now you might have a fried component or two in there. Hard to say and I'm just guessing based on what you've posted. Did you ever get the no-spark issue repaired?
i made some more corrections to the harness and made it match the 7730 schematic more. and now im not getting spark. im just gonna over time till it gets warm again, replace all the sensors and get a new ECM. and go over my harness again and make sure everything is correct.
nope. weather pack are like the TPS, IAC, and MAP sensor connectors. im not sure what the ECM ones are called. maybe ECM type pins or something along those lines.
EDIT: you can look for the ecm connector pin removal tool kit and it comes with so many of the correct style female pins and the pin removal tool. its hexagonal shaped. and i think it even has the weatherpack terminal removal tool too.
Originally posted by mtownfiero: so i have to let it time itself?
no, it is already timed. timing on a DIS is controlled by a timing wheel on the crankshaft. there is nothing to move/vary from engine to engine, like a cap & rotor, so, the timing can be fixed/unadjustable.
ok, warm day and had about 45 min of daylight.... i tested the wires between the 5 pin DIS connector and the ECM plugs. all checked out fine. checked the power and ground on the 2 pin, all good. i removed the crank sensor wiring to wind together in the correct fashion i heard about from joe. well see what happens....anyone else have any input? if that proves nothing, then im down to replacing the ICM. remember, no spark and the tach needle isnt moving. so its not getting something to send out.... crank sensor is going to be replaced too.
ok, i just made a corrected crank prosition sensor wire (wires twisted together) and i am still getting no spark. tach needle isnt moving during cranking either. ICM possibly?
ok, i just made a corrected crank prosition sensor wire (wires twisted together) and i am still getting no spark. tach needle isnt moving during cranking either. ICM possibly?
If your crank sensor is good and you have verified the wiring between the crank sensor and ignition module; and you have verified the ICM is getting power and ground where it needs them; then yes, it could be a bad ICM.
I'm sorry if this was covered before, but I couldn't find it.
I am making an adaptor wire interface to be able to plug in the factory Fiero wire harness with minimal modification to the Fiero. I have the Wire harness from the 7730 and the pin side of the Fiero computer ('87 GT). The I see the pin connection listed as "Pin A1 move to Pin BA11". The Fiero side pins are obvious. There are 4 banks of pins... A,B,C, and D. All of the pins are numbered. simple. The pins on the 7730 wire harness are labeled as 6 banks A,B,C,D,E, (and I presume but it is not marked) F. Which pin is "BA11"? is that the one in pin bank "A" and PIN #11? What does the "B" in front of it mean? Is that the connector (there are 3 which could correspond to B and G and Secondary wire harness)?
So in summary.... What does the "B" and the "G" for the 7730 Pin location mean?
I'm sorry if this was covered before, but I couldn't find it.
I am making an adaptor wire interface to be able to plug in the factory Fiero wire harness with minimal modification to the Fiero. I have the Wire harness from the 7730 and the pin side of the Fiero computer ('87 GT). The I see the pin connection listed as "Pin A1 move to Pin BA11". The Fiero side pins are obvious. There are 4 banks of pins... A,B,C, and D. All of the pins are numbered. simple. The pins on the 7730 wire harness are labeled as 6 banks A,B,C,D,E, (and I presume but it is not marked) F. Which pin is "BA11"? is that the one in pin bank "A" and PIN #11? What does the "B" in front of it mean? Is that the connector (there are 3 which could correspond to B and G and Secondary wire harness)?
So in summary.... What does the "B" and the "G" for the 7730 Pin location mean?
Thank you.
The "B" in front of "BA11" stands for "Black" connector. So "BA11" means "Black Connector, pin A11". And pin "GF16" means "Green (or yellow) Connector, pin F16".
The "B" in front of "BA11" stands for "Black" connector. So "BA11" means "Black Connector, pin A11". And pin "GF16" means "Green (or yellow) Connector, pin F16".
Thank you Ryan! I was not sure if you or anyone else was checking this thread any more.
One more question..... I am using a harness out of a 91 F-body just like your Pin to Pin chart says (so I figure they should be close). While trying to make this harness, I noticed that on the F-body pig tail there was no wire for (I'm trying to remember) GF6. Should I be using the Fiero pig tail (I have a spare from the junk yard) to re-pin into the F-body connectors and then solder it to the back of the female Fiero computer input? (I have a junk one of those too ) OR, should I be using the F-body pig tail as the main wires?
Thanks for the help! I'll be needing a reprogram soon if things go well.
Thank you Ryan! I was not sure if you or anyone else was checking this thread any more.
One more question..... I am using a harness out of a 91 F-body just like your Pin to Pin chart says (so I figure they should be close). While trying to make this harness, I noticed that on the F-body pig tail there was no wire for (I'm trying to remember) GF6. Should I be using the Fiero pig tail (I have a spare from the junk yard) to re-pin into the F-body connectors and then solder it to the back of the female Fiero computer input? (I have a junk one of those too ) OR, should I be using the F-body pig tail as the main wires?
Thanks for the help! I'll be needing a reprogram soon if things go well.
Nevermind.... I think I figured it out. I am going to use the Fiero wires so that I can match up colors. Should make it easier to trace later.
Thank you Ryan! I was not sure if you or anyone else was checking this thread any more.
One more question..... I am using a harness out of a 91 F-body just like your Pin to Pin chart says (so I figure they should be close). While trying to make this harness, I noticed that on the F-body pig tail there was no wire for (I'm trying to remember) GF6. Should I be using the Fiero pig tail (I have a spare from the junk yard) to re-pin into the F-body connectors and then solder it to the back of the female Fiero computer input? (I have a junk one of those too ) OR, should I be using the F-body pig tail as the main wires?
Thanks for the help! I'll be needing a reprogram soon if things go well.
You can remove pins/wires from the Fiero ECM connectors and insert them into the connectors you are using for the 7730 ECM as needed. If you have extra left over from the F-body harness/connectors, you can use those as well.
Code 54 = fuel pump voltage low. This code usually sets when the Fuel Pump relay has failed (but the engine may continue to start and run because the fuel pump in stock Fiero applications gets power via the oil pressure switch which acts as the backup circuit).
Hey Guys! Don't mean to hijack but I thaught this is where everyone I am looking for would be. I am needing to enlist the help of somone familiar with doing the wiring for a 3400(LA1)/7730 swap into a fiero. This wiring is the last hurdle in my swap and I was hoping to get this thing together this summer. Thanks.
Man what an awesome thread. Too bad there's not a similar upgrade for the 2.5L
Actually there can be. The S10 pickups used the 2.5 duke with a distributor up until 1993. These used the 1227165 / 16156647 ECMs which were of the "P4" generation (same ECM was used in 1986-89 TPI V8 cars). The only problem is these ECMs use different connectors and wire terminals vs. stock Fiero; so the conversion wouldn't just involve a simple repinning of the harness. You would need to either buy the proper terminals and crimp them on or splice in wires that had the correct terminals. I have not done this conversion yet so I cannot tell you if there are any worthwhile benefits. This conversion would only work for 1984-86 Fiero 2.5's that had the distributor. 1987-88 2.5's with DIS won't be compatible with this ECM; but you wouldn't need it anyway. The ECM used in these cars was used thru 1991 in others with the same engine.
Im basicly looking for something like winaldl but for the 7730. I want to be able to look at the values being sent to the ecm from the sensors since my motor is running slighltly rough.
Actually there can be. The S10 pickups used the 2.5 duke with a distributor up until 1993. These used the 1227165 / 16156647 ECMs which were of the "P4" generation (same ECM was used in 1986-89 TPI V8 cars). The only problem is these ECMs use different connectors and wire terminals vs. stock Fiero; so the conversion wouldn't just involve a simple repinning of the harness. You would need to either buy the proper terminals and crimp them on or splice in wires that had the correct terminals. I have not done this conversion yet so I cannot tell you if there are any worthwhile benefits. This conversion would only work for 1984-86 Fiero 2.5's that had the distributor. 1987-88 2.5's with DIS won't be compatible with this ECM; but you wouldn't need it anyway. The ECM used in these cars was used thru 1991 in others with the same engine.
-ryan
Ooh now that's interesting. Maybe I could build an adapter harness so I could swap back and forth between the original computer and the newer one, like Jncomutt made on page 5. Need to start looking for a 92 S-10 shop manual with wiring diagrams, check the ECM pinouts...
Would the stock chip in these computers run the 84 (plug it in and fire it up once the harness is adapted), or would it need a custom chip burned? The 1227165 seems to be going for about $50 on ebay...
Ooh now that's interesting. Maybe I could build an adapter harness so I could swap back and forth between the original computer and the newer one, like Jncomutt made on page 5. Need to start looking for a 92 S-10 shop manual with wiring diagrams, check the ECM pinouts...
Would the stock chip in these computers run the 84 (plug it in and fire it up once the harness is adapted), or would it need a custom chip burned? The 1227165 seems to be going for about $50 on ebay...
While I haven't looked into this too much, I would imagine a stock chip from an S10 2.5 would run the Fiero 2.5 just fine; as long as the transmission type the chip was made for (auto or manual) matched the transmission you have in the car.
still no spark started checking DIS wires. first was all the grounds for the DIS. the 2 pin power connector is good. the 5 pin, i checked ground first. pin "F". it shows its grounded when the IGN is OFF. when i turn ign to run, it shows OL on the DMM meaning its open. does this mean my ECM is toasty?
also, on the 5 pins on that DIS connector, is pin E, the REFERENCE supposed to be at 5v or what? how can i test to see that the ECM is putting the right ' stuff ' out for the BYPASS, EST and the REF?
Gwain, thank you for the EGR adaptor plate. Got it last Friday. Ryan, thank you for all your help and answered questions. I've just about got this thing ('87 GT) all wired up and ready to turn the key. The goal is to have it all done so al I have to do is plug in the PROM when Ryan is done with it Thanks again guys!
also, on the 5 pins on that DIS connector, is pin E, the REFERENCE supposed to be at 5v or what? how can i test to see that the ECM is putting the right ' stuff ' out for the BYPASS, EST and the REF?
I believe the Reference output from the ICM should toggle between 5v and ground (high/low) to signal the ECM there was a "reference pulse". However, let's not get ahead of ourselves here. The ICM should command the coils to produce a spark with a cranking engine WITHOUT any ECM connected to it. All it needs is power, ground, and a crank sensor signal. So I recommend you disconnect the ECM connection to the ICM and work to get your spark events occurring first. Then we'll worry about what the ECM is doing.
) OR, should I be using the F-body pig tail as the main wires?
started checking DIS wires. first was all the grounds for the DIS. the 2 pin power connector is good. the 5 pin, i checked ground first. pin "F". it shows its grounded when the IGN is OFF. when i turn ign to run, it shows OL on the DMM meaning its open. does this mean my ECM is toasty?
