Computer Error Problem
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Joined: Nov 2002
Posts: 68
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From: Round Rock TX
Computer Error Problem
I took my car to a transmission shop today. While they were doing the diagnostic portion of their checklist, they hooked it up to a scan tool. It indicated a Quad Driver Fault 1 and 3. What are these faults? What do they affect?
I have been fighting an idle problem since I installed a crate motor and it has always had a mild stumble since I purchased the car. Are these faults an indication that my ECM needs to be replaced?
TIA
I have been fighting an idle problem since I installed a crate motor and it has always had a mild stumble since I purchased the car. Are these faults an indication that my ECM needs to be replaced?
TIA
Race Director
Joined: Aug 2002
Posts: 13,356
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From: tucson AZ
St. Jude Donor '04 & '05
Re: Computer Error Problem (newowner'91)
Did you reinstall all the stock parts.....including the injectors......etc......
What about the ECM??????
Just wondering......
did you reinstall all the stock items???????
Just would like to know.....
What do you think??????
tony
:smash: :smash: :grouphug:
What about the ECM??????
Just wondering......
did you reinstall all the stock items???????
Just would like to know.....
What do you think??????
tony
:smash: :smash: :grouphug:
Thread Starter
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Joined: Nov 2002
Posts: 68
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From: Round Rock TX
Re: Computer Error Problem (oldace84)
I replaced the injectors with stock replacements. I have a Fastburn 385 Crate Motor, Miniram III, 58MM Throttlebody, Ed Wright Chip,Hi flow Fuel Pump, High Flow Cat with Flowmasters. Everything else is stock including the orginal precats.
I would like to know if the computer is going bad so I can replace it.
I would like to know if the computer is going bad so I can replace it.
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
Re: Computer Error Problem (newowner'91)
From a tranny shop? I didn't think a PCM on '91 OBD 1 could spit this out. Did you get a printout of all the scan data? Generally reading is high or low with low being ok. As I recall, PCM is fault protected in that if the wiring shorts, driver is shut down until problem is fixed. Off hand, check injector wiring.
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
Re: Computer Error Problem (SunCr)
Thinking about it a little more, a fault in both drivers should mean that the ground to the injectors wasn't applied by the PCM so on a batch fire, it probably wouldn't run. I kinda think the function was disabled on the scanner and the tech didn't know what he was looking at or that custom chip has a little bit more programmed into it than stock. Post the full scan if you got it.
Thread Starter
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Joined: Nov 2002
Posts: 68
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From: Round Rock TX
Re: Computer Error Problem (SunCr)
Unfortunately, it was a hand held scanner and it did not have a print out function. This sounds like a good excuse to purchase some diagnosic software.
