Guest BREH Posted March 31, 2007 Share Posted March 31, 2007 Are The BCM and ECM's The same for THE 88 89 90 & 91's ??? THANKS. Link to comment Share on other sites More sharing options...
Guest CL_Reatta Posted March 31, 2007 Share Posted March 31, 2007 I know that the 91 ECM is different because of the Tuned Port Injection, I am not sure about the other years/computers though Link to comment Share on other sites More sharing options...
padgett Posted March 31, 2007 Share Posted March 31, 2007 Oddly enough I show the same ECM part numbers for all four years. The PROM is different for each year and the 91 has the E-trans but apparently the same computer. Link to comment Share on other sites More sharing options...
manikmekanik Posted March 31, 2007 Share Posted March 31, 2007 Yes, the ECM mainboard is identical for all 4 years, the prom will change for later model, due to trans and engine upgrades.When you replace such a unit, you MUST insert the PROM (Programmable Read-Only Memory) chip which was originally in your car. Link to comment Share on other sites More sharing options...
Jim Posted March 31, 2007 Share Posted March 31, 2007 From my experience and from my GM factory parts and illustration catalog both the ECM and BCM are different in the '91s from the '88-90s.ECM------ The book shows 1228253 for all years '88-90 but also many '89s came with a 16198264. These two ECMs will interchange but as mentioned you should use your original PROM. The ECM for a '91 is 16141470 and the colors on the connectors are also different.BCM------The book shows 1227253 for 1988 and 1228786 for '89-90 but in dismantling many '90s I have found quite a few to have the 1227253s in them from the factory. Again both numbers should work but in this case you definitely have to put in your original PROM.The p/n for a '91 BCM is 16137944 and like the ECM it has different color connectors. Link to comment Share on other sites More sharing options...
padgett Posted March 31, 2007 Share Posted March 31, 2007 Thank you Jim - I had wondered whether the -253 had all of the drivers necessary for the E transmission.BTW the BCM has two PROMs not one, a 27C256 and a 28C16 and both are in black carriers that do not look anything like (are much smaller) than the blue CalPak in the ECM. Link to comment Share on other sites More sharing options...
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