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About EEPROM what recommed?

4 messages,  Last post on Jul 17, 2009 at 6:25 PM

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#1 of 4 About EEPROM what recommed? by victorh61 Jul 11, 2009 (5:32 am)
I have a geo metro 3 cilynders1995, can l change my eeprom for another one with same serial code or no matter if It belongs to another geo metro 3 cilynders with a different serial code? B regards Victor Replies to this message: zaken1 (Jul 14, 2009 10:19 pm) victorh61 (Jul 15, 2009 7:07 pm) zaken1 (Jul 17, 2009 6:25 pm)
#2 of 4 Re: About EEPROM what recommed? [victorh61] by zaken1 Jul 14, 2009 (10:19 pm)
Replying to: victorh61 (Jul 11, 2009 5:32 am) I guess this depends on what you mean by "eeprom." The actual eprom chip is a part which plugs into a circuit board in the engine control computer. But what most people would mean by that term is the whole computer assembly. The computer assemblies are made in several different models; some of which were used on California emission spec cars; others used on federal emission spec cars; some were used on manual transmission vehicles; and others were used on automatic transmission vehicles. There was also a computer used on the XFI model; which was only made through 1994. This model was calibrated for maximum fuel economy. And the computer in the 1988 to 1991 base model Metro and the 1988 to 1990 LSI did not have electronic spark timing; so it would not be compatible with the later cars ignition systems.   So if you want to find a computer which can be used to replace your 1995 model; it would have to be from a 3 cylinder car, with the same type of transmission as yours. It would be an even better match if it was also made for the same type of emission spec (either federal or California, or Canadian) I would also recommend not using a computer from a convertible in a sedan; or vice versa. Beyond that, most of the other differences would not be important.   The same would apply if you just wanted to change the eprom chip; but I believe this chip is not removable; like it is in some larger American vehicles. Replies to this message: victorh61 (Jul 15, 2009 7:07 pm) zaken1 (Jul 17, 2009 6:25 pm)
#3 of 4 Re: About EEPROM what recommed? [zaken1] by victorh61 Jul 15, 2009 (7:07 pm)
Replying to: zaken1 (Jul 14, 2009 10:19 pm) Hi zaken 1 Thank you for info..what eeprom means is engine control computer,and what I understand,according to what you said is that I can change my engine control computer keeping in mind the same characteristics: 3 cylinder, transmission and type of emission spec. Am I rigth? Again thanks for your help. Replies to this message: zaken1 (Jul 17, 2009 6:25 pm)
#4 of 4 Re: About EEPROM what recommed? [victorh61] by zaken1 Jul 17, 2009 (6:25 pm)
Replying to: victorh61 (Jul 15, 2009 7:07 pm) Yes, what you said is right; except for one thing. The name e-prom does not mean the engine contol computer. It is the name of one small part which is located inside that computer. The computer is called the EEC, for electronic engine control. EEPROM means electronic engine programmable unit. The eprom is the part that contains the instructions to tell the rest of the computer how to process the information it receives from all the vehicle's sensors. This part is also known as the "chip." It is the only part in the computer that can be programmed.

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