mellow65 Posted March 20, 2009 Share Posted March 20, 2009 has anyone taken on the challenge of repining the ej18 ecu plugs to work with the ej22 ecu. yes i know i can put a ej22 right under the ej18 manifold and motor down the road. but i'm looking to get that knock sensor that the ej22 ecu offers that the ej18 does not. i figure there has to be pretty much the same amount wires between the 2. i know the ej18 has a couple things the ej22 doesn't, egr, some other air bypass solenoid. but has anyone tackled this idea. or am i just going to need to strip everything down and lay in an ej22 harness to get it right. Quote Link to comment Share on other sites More sharing options...
Legacy777 Posted March 23, 2009 Share Posted March 23, 2009 I had thought there may be some things the EJ22 has that the EJ18 doesn't. That's where you're going to run into your biggest issue. As long as the ECU pins are the same, and can be swapped between connectors, it should work in theory. Quote Link to comment Share on other sites More sharing options...
mellow65 Posted March 23, 2009 Author Share Posted March 23, 2009 from what i have found it's really the other way around. the ej18 has more crap then the ej22. and even if i sit down with a pin out of both ecus they seem to call the same thing something different. so it's just a pain to sort out. but it's just probably going to take me sitting down with the car and a ohms meeter and tracing wires. i was just hoping i could find someone that took this on once before. Quote Link to comment Share on other sites More sharing options...
johnceggleston Posted March 23, 2009 Share Posted March 23, 2009 are the plug configurations the same? could you just swap in an ej22 ecu with the engine? at some point the impreza came with a 22 or 18, i can't imagine the wiring was very different. Quote Link to comment Share on other sites More sharing options...
Legacy777 Posted March 24, 2009 Share Posted March 24, 2009 Plug configuration is not the same. Quote Link to comment Share on other sites More sharing options...
mellow65 Posted March 24, 2009 Author Share Posted March 24, 2009 are the plug configurations the same? could you just swap in an ej22 ecu with the engine? at some point the impreza came with a 22 or 18, i can't imagine the wiring was very different. the impreza didn't get a ej22 until they swapped over to obd2. in the 95 impreza the ej22 was obd2 a full year before it was required. aparently the obd2 plugs are the same, but the obd1 stuff is way different. Quote Link to comment Share on other sites More sharing options...
s'ko Posted March 24, 2009 Share Posted March 24, 2009 (edited) just printed out diagrams for a 93 EJ18 and a 93 EJ22. EJ18 has 3 plugs to ECU, a 26 pin, a 22 pin and a 16 pin EJ22 has 4 plugs to ECU, a 26 pin, a 22 pin, a 16 pin and a 12 pin. just by looking at the 26 pin plugs, you are going to have to rewire ALOT. EJ18 pin 1 & 2 goes to bypass air control sol. 3 tach 4 VSS 5 data link/cruise control 6 data link/cruise control 7 A/C relay box 8 fuel pump relay 9 a/c system 10 fuel pump relay power 11 a/c system 12 inhibitor switch 13 main relay/air flow meter 14 & 15 ground 16 neutral switch 17 test mode, neutral switch 18 main relay 19 read memory 20 test mode, check connector 21 no wire 22 check engine light 23 a/c diode 24 ficd solenoid valve 25 ground 26 power fuse #14 EJ22 pin 1 & 2 idle air sol valve 3 & 4 no wire 5 diode 6 cpc solenoid 7 & 8 no wire 9 & 10 igniter 11 fuel injector 3 12 fuel injector 2 13 fuel injector 1 14 ground 15 ground/igniter ground 16 no wire 17 main fan relay 18 select monitor 19 check engine 20 & 21 no wire 22 a/c cut relay 23 fuel pump relay 24 & 25 grounds 26 injector 4 looks like a lot more trouble than it's worth. BW Edited March 24, 2009 by s'ko Quote Link to comment Share on other sites More sharing options...
mellow65 Posted March 24, 2009 Author Share Posted March 24, 2009 just printed out diagrams for a 93 EJ18 and a 93 EJ22. EJ18 has 3 plugs to ECU' date=' a 26 pin, a 22 pin and a 16 pin EJ22 has 4 plugs to ECU, a 26 pin, a 22 pin, a 16 pin and a 12 pin. just by looking at the 26 pin plugs, you are going to have to rewire ALOT. EJ18 pin 1 & 2 goes to bypass air control sol. 3 tach 4 VSS 5 data link/cruise control 6 data link/cruise control 7 A/C relay box 8 fuel pump relay 9 a/c system 10 fuel pump relay power 11 a/c system 12 inhibitor switch 13 main relay/air flow meter 14 & 15 ground 16 neutral switch 17 test mode, neutral switch 18 main relay 19 read memory 20 test mode, check connector 21 no wire 22 check engine light 23 a/c diode 24 ficd solenoid valve 25 ground 26 power fuse #14 EJ22 pin 1 & 2 idle air sol valve 3 & 4 no wire 5 diode 6 cpc solenoid 7 & 8 no wire 9 & 10 igniter 11 fuel injector 3 12 fuel injector 2 13 fuel injector 1 14 ground 15 ground/igniter ground 16 no wire 17 main fan relay 18 select monitor 19 check engine 20 & 21 no wire 22 a/c cut relay 23 fuel pump relay 24 & 25 grounds 26 injector 4 looks like a lot more trouble than it's worth. BW[/quote'] yeah looks like that. well i guess if it ever comes down to it, i'll just be laying a ej22 harness in there and making it work. at least i have done 3 of those and all 3 are still running. i have always wondered how much the ej22 ecu cares that some crap isn't there. i know it runs fine with a bunch of stuff missing, but i'm wondering if it's running to its full potential. Quote Link to comment Share on other sites More sharing options...
s'ko Posted March 24, 2009 Share Posted March 24, 2009 yeah looks like that. well i guess if it ever comes down to it, i'll just be laying a ej22 harness in there and making it work. at least i have done 3 of those and all 3 are still running. i have always wondered how much the ej22 ecu cares that some crap isn't there. i know it runs fine with a bunch of stuff missing, but i'm wondering if it's running to its full potential. on my EJ18 BRAT I didn't hook up these wires 5 data link/cruise control 6 data link/cruise control 7 A/C relay box 9 a/c system 11 a/c system 12 inhibitor switch 16 neutral switch 17 test mode, neutral switch 23 a/c diode On the EJ22T I didn't hook up these wires. 17 main fan relay 18 select monitor 22 a/c cut relay again dealing with the 26 pin plug both ran fine. Quote Link to comment Share on other sites More sharing options...
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