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If you change the engine control module on a 1994 cavalier must you change the prom and where is it?
Wiki User
∙ 14y ago
1994 was the change over year for GM. It is OBD 1.5. The previous years have a PROM chip in the ECM. There will be two small screws and when you take them out the panel comes off and allows access to the PROM. I am not 100% certain, but I think the 94 has to be programmed at the dealer. If you do not have this access panel then I'd say it's a certainty that you'll have to have that one programmed.
Wiki User
∙ 14y ago
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