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DFI and ECM Discuss all aspects of DFI (Digital Fuel Injection), ECMs (Electronic Control Module), scanners, and diagnostic equipment. Fine tune your Third Gen computer system for top performance.

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Old 04-30-2013, 12:40 PM   #1
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OBD tool unable to scan for codes, paperclip only shows code 12

Ok here goes. Trying to read OBD codes with a Inova 3120b and no connection present, Also have a Laptop with USB to GM OBD cable, and Scanmaster software. Unable to interface

2.8 MFI 1985 Camaro

Diag port paper clip shows code 12
Diag port voltage a and b shows 5.05volts
Diag Port voltage a and e shows a fluctuating but kinda steady around 3.8volts

ECM seems in good working order, chip is seated and no visable damage is present

So my guess is the the ECM is bad or the memory chip on the ECM is bad.

Symptoms of car .. Rough to start when cold, have to press pedal for first 20 secs to keep a idle going, then it starts to idle ok, but still rough. Under acceration, 70mphs, sluggish and unresponsive. Having to downshift from 5th to 4th going up a looong hill..

Replaced all the sensors except the MAF, which I don't have a spare. Same conditions. Now I have been trying to diag the MAF, but Im not sure. Ran the CODE 34 MAF trouble code diagram, (even thought I can not say for sure it is a code 34) on page 6e3-45 of the GM shop manual. Start engine, Light is off. Says to check th MAF, looks ok, but since I don't have one to compare it with .. very slight blistering on the center part, where there is 15 copper wires in a line.. Tried to run a HZ test on the MAF but the connectors are sealed and I guess I would have to cut the wires themselves to gain access.

So what do you guys think, bad ECM, or bad MAF ?
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Old 04-30-2013, 02:29 PM   #2
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Re: OBD tool unable to scan for codes, paperclip only shows code 12

i needed a 10k resistor to start reading . 87
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Old 04-30-2013, 09:42 PM   #3
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Re: OBD tool unable to scan for codes, paperclip only shows code 12

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i needed a 10k resistor to start reading . 87
Thanks .. tried that tonight... no luck..

Also switched out the MAF, found a spare I had, car ran a little smoother but still throws a check engine light, Also found another computer in one of my boxes, same number 1226870 and swapped computers... Still not able to read any codes.

Funny think is with the old computer the car idled around 700-750ish, manual transmission.. I should note that the car was originally a Auto and I did a manual swap. The two wires on the gear selector that tell the engine its in gear where left unconnected.. Swapped in the second computer and the car now idles at 1800-2000ish.. Paper clip test on the second computer does not throw a a code 12 or any codes...

Ill take it for a road test tomorrow with the 2nd computer and see what happens..
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Old 05-01-2013, 06:25 AM   #4
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Re: OBD tool unable to scan for codes, paperclip only shows code 12

are you picking a com port? usually com3 for me .
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Old 05-01-2013, 08:42 AM   #5
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Re: OBD tool unable to scan for codes, paperclip only shows code 12

on the second ecm have you looked to see what prom and calpak are in that ecm ? The 1226870 was used on tpi v8 in 85 as well. if the engine light is rapidly blinking you have the incorrect prom and calpak installed. The prom will have 3 letters on it as a identifier. Win aldl will connect to this ecm but you will need to at least enter field service mode first.
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Old 05-01-2013, 11:34 AM   #6
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Re: OBD tool unable to scan for codes, paperclip only shows code 12

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on the second ecm have you looked to see what prom and calpak are in that ecm ? The 1226870 was used on tpi v8 in 85 as well. if the engine light is rapidly blinking you have the incorrect prom and calpak installed. The prom will have 3 letters on it as a identifier. Win aldl will connect to this ecm but you will need to at least enter field service mode first.
Yep I get com 3 showing up... Scanmaster trys to scan the port, at 38,000 baud ? then 112,000 baud. no luck.. Unable to interface. Although I read somewhere the ecm only communicates at 160baud

Both computers are 1226870. The calpak are both identical. 16046461 and prom numbers are both Delco FRF 9839

Althought the second seems to have a dealership service number on it.. written in pen

First ECM is below



2nd ECM is

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Old 05-01-2013, 11:41 AM   #7
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Re: OBD tool unable to scan for codes, paperclip only shows code 12

The frf is the correct prom, the 870 connects through e of the aldl at 160 baud. I'm unfamiliar with scan master, you might try to connect with winaldl.
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Old 05-01-2013, 12:15 PM   #8
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Re: OBD tool unable to scan for codes, paperclip only shows code 12

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The frf is the correct prom, the 870 connects through e of the aldl at 160 baud. I'm unfamiliar with scan master, you might try to connect with winaldl.
Thanks for your help btw Tuned proformance

Ok got winaldl installed and working.. Now to learn how to read it lol

I have no error codes right now showing up which is good, Idle is sitting at 1200 semi warm..

this is a screenshot of it with the car runnin

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Old 05-01-2013, 12:35 PM   #9
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Re: OBD tool unable to scan for codes, paperclip only shows code 12

Thats connected ?
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Old 05-01-2013, 12:38 PM   #10
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Re: OBD tool unable to scan for codes, paperclip only shows code 12

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Thats connected ?
yes and idling at 1100
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Old 05-01-2013, 12:55 PM   #11
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Re: OBD tool unable to scan for codes, paperclip only shows code 12

There is no sensor data and no reps in the screen shot.
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Old 05-01-2013, 01:15 PM   #12
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Re: OBD tool unable to scan for codes, paperclip only shows code 12

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There is no sensor data and no reps in the screen shot.
Ocassionally I get a blip in the IAC CT and EGR col.. but only say once ever 20 secs maybe.. that's about all the data it gives me so far..
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Old 05-01-2013, 01:17 PM   #13
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Re: OBD tool unable to scan for codes, paperclip only shows code 12

Try lowering the baud rate, that ecm is super slow
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Old 05-01-2013, 01:31 PM   #14
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Re: OBD tool unable to scan for codes, paperclip only shows code 12

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Try lowering the baud rate, that ecm is super slow
2400 is as slow as the program will let me go .. I have the 10k resistor setting as well ..
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Old 05-01-2013, 01:37 PM   #15
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Re: OBD tool unable to scan for codes, paperclip only shows code 12

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2400 is as slow as the program will let me go .. I have the 10k resistor setting as well ..

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Old 05-01-2013, 01:42 PM   #16
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Re: OBD tool unable to scan for codes, paperclip only shows code 12

It may just be how it is, Im not sure that ecm need a 10k resister to enable the data stream. Even if you go to a 302 ecm it will be slow. Learning how to reprogram and going to the 1227730 ecm and changing to speed density would be a big improvement or talk to six shooter.
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Old 05-01-2013, 02:09 PM   #17
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Re: OBD tool unable to scan for codes, paperclip only shows code 12

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Originally Posted by Tuned Performance View Post
It may just be how it is, Im not sure that ecm need a 10k resister to enable the data stream. Even if you go to a 302 ecm it will be slow. Learning how to reprogram and going to the 1227730 ecm and changing to speed density would be a big improvement or talk to six shooter.
will do

thanks
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Old 05-01-2013, 02:39 PM   #18
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Re: OBD tool unable to scan for codes, paperclip only shows code 12

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will do

thanks
ok lots of looking around found a site http://forums.corvetteforum.com/c4-s...-corvette.html et to set the baud at 4800 with 10k resistor installed.. Now I am getting data in all col's
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Old 05-01-2013, 02:48 PM   #19
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Re: OBD tool unable to scan for codes, paperclip only shows code 12

Nice , glad you made big progress
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Old 05-05-2013, 10:19 PM   #20
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Re: OBD tool unable to scan for codes, paperclip only shows code 12

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Nice , glad you made big progress
Ok just a quick update, now that I got the computer to read the codes, fixed the two bad sensors, EGR solenoid, and MAT. Reset the timing, (was not aware at the time last year to disconnect the EST wire). Car still ran lean, and after some more testing, came to the conclusion that the Injectors needed replacing..

Car runs like a stock V6 now, if that is any good Engine is solid as a rock 135-138PSI compression.

Thanks to Tunedperformance for the tips.. Plans are now to drive for the summer and look to do a 730 swap in the winter when I park it. Learn to tune the 730 then fab up a turbo system for it. The block is good for 400hp, (so I read somewhere) rear end well that would have to be changed out too.

730 J bodies are a dime a dozen around here, and we have a self service wrecking yard with over 2000 vehicles in stock any given day..

Heres to lots of reading over the summer
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Old 05-05-2013, 10:23 PM   #21
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Re: OBD tool unable to scan for codes, paperclip only shows code 12

pick six shooters brain he is a wealth of knowledge on tuning and mods on six bangers
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Old 05-06-2013, 10:04 AM   #22
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Re: OBD tool unable to scan for codes, paperclip only shows code 12

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pick six shooters brain he is a wealth of knowledge on tuning and mods on six bangers
yep He helped diagnose the lean condition for me.
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Old 05-06-2013, 10:04 AM
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