rlith
03-09-05, 09:19 PM
Well, as the time draws near for my 5.7 vortec swap, I'm accumulating more and more information...My biggest concern has been the ecm and electrical system for the motor. So I've been haunting my local dealerships for various manuals to copy and printouts from their TTII system.... I found out some very interesting things...
95's with ODBII (ecm under the hood) ECM's/harness' have the EXACT same pin outs, circuit id's and colors as the 96/97 ECM's/harness'. The only real variance is on that harness for the injector connector (obvious) and the MAF vs MAP sensor...(and a couple of other accessory connectors) But even with those connectors, the same voltages, resistance values, circuit id's and colors are EXACTLY the same... This includes the pin outs at the firewall.
I decided to go a little bit farther and grab a couple of ecms, 1 from a 95 and 1 from a 97... After tearing them apart all chips, circuit boards etc are EXACTLY the same... Which means that all the tech 2 system is doing is wiping the eprom and inserting different values for the pulsing systems for the injectors and a few other things...
What does this mean? It means you could easily take a 96-current vortec motor with a 96/97 ECM and harness and drop it straight into your 95. (Obviously you would need the proper accessories for the motor, I.E. Ac pump, alt, sensors, etc) I've looked at the schematics of the harness's and as I said, the circuit id's, colors, and resistance variables are all the same...heh...I wish I knew this when my original motor blew!
I should also note that the k1500 harness is basically the same as the others except for additional wires for the 5.7 injector system.
95's with ODBII (ecm under the hood) ECM's/harness' have the EXACT same pin outs, circuit id's and colors as the 96/97 ECM's/harness'. The only real variance is on that harness for the injector connector (obvious) and the MAF vs MAP sensor...(and a couple of other accessory connectors) But even with those connectors, the same voltages, resistance values, circuit id's and colors are EXACTLY the same... This includes the pin outs at the firewall.
I decided to go a little bit farther and grab a couple of ecms, 1 from a 95 and 1 from a 97... After tearing them apart all chips, circuit boards etc are EXACTLY the same... Which means that all the tech 2 system is doing is wiping the eprom and inserting different values for the pulsing systems for the injectors and a few other things...
What does this mean? It means you could easily take a 96-current vortec motor with a 96/97 ECM and harness and drop it straight into your 95. (Obviously you would need the proper accessories for the motor, I.E. Ac pump, alt, sensors, etc) I've looked at the schematics of the harness's and as I said, the circuit id's, colors, and resistance variables are all the same...heh...I wish I knew this when my original motor blew!
I should also note that the k1500 harness is basically the same as the others except for additional wires for the 5.7 injector system.