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Cali p28

Old 03-20-2005, 02:13 PM
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Default Cali p28

so i opened up my p28 for the first time and there was a chipp in it i brought it over to my friend steve that does my ecus and he asked someone on here what to do if we can use the ecu becuase i had a chip in it already and we trying to socket it for uberdata so we put it in and when i tryed to start up my car it didnt and i put my friend ecu intere with uberdata and it started right up what extacly needs to be taking out and can you even use the ecu please let me know and pictures or anything will help alot
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Old 03-20-2005, 02:17 PM
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Default Re: Cali p28

Is this ecu trying to be run stock? just cut the jumper at location J1 on the ecu and that will return the ecu back to stock form. I wouldn't try and run the chip that was in the ecu unless you know what was programmed onto it.
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Old 03-20-2005, 02:54 PM
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Default Re: Cali p28

You need to take the chip out too. Projekteg says that the ecu wont run right unless you remove the chip as well.
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Old 03-20-2005, 03:45 PM
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Default Re: Cali p28

Even though J1 is cut How does that make sense? by cutting J1 your eliminating that part of the circut.
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Old 03-20-2005, 05:02 PM
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Default Re: Cali p28

Originally Posted by tranceminister
Even though J1 is cut How does that make sense? by cutting J1 your eliminating that part of the circut.
I assume that J1 isnt the only connection from the processor to the external rom...J1 just tells the processor to read from the rom. If there is no chip there, the signals that get sent to that area go no where and the processor doesnt care. If there is a chip there, the signals get blocked or changed and possibly sent back to the processor which confuses it and the ecu goes limp.

this is all just a guess really....
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Old 03-20-2005, 06:21 PM
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Default Re: Cali p28

so you cant run the cali p28?
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Old 03-20-2005, 06:33 PM
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Default Re: Cali p28

Originally Posted by 5thgencivickid
so you cant run the cali p28?
Sure you can...im sure his didnt come stock this way...
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Old 03-20-2005, 09:36 PM
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Default Re: Cali p28

just desolder the chip or cut the legs and heat up the solder while pulling them out then desolder the board there. solder in zif and viola.
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Old 03-20-2005, 11:51 PM
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Default Re: Cali p28

im so confusedddd lol explain in english how i can get my ecu to work with the uberdata so dont need to get another p28?
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Old 03-21-2005, 12:41 AM
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Default Re: Cali p28

Yes, stock OBD1 ECUs can be external EEPROM from the factory. They do this for California's emissions.

It's all good. All of the work has already been done for you. Don't cut J1. Just desolder the EEPROM (28 pin), put a socket in, then put in your Uberdata chip. That is all you have to do.

Leave J1.. Desolder 28 pin EEPROM.. solder in socket.. Insert Uberdata chip.
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