ECCS and do I need to swap harness??

[Strato_54]

Hello, im planning on doing some pretty custom work to my rig in the next few months - year and am still at the beginning stages of what Im planning. However, what is ECCS? Ive figured out its to do with the ECU and how it controls engine components. but is this some fancy separate thing or is this another case of Nissan trying to be different with their wording? (MAP, nah, Absolute sensor!) Basically i'm swapping ECU and am wondering if I need to run the ECCS wires to something other than the ECU to make my harness work. It looks like a basic 10-14V output but Im not sure what it controls other than a relay labeled self shut off in the service manual. I also need to figure out how im going to run the SCB valve wire, so if I repin my harness just use the now unused ECCS for my SCB? This is a small problem compared to what's ahead but Its what prevents me from having a running engine at the least. 

 

Should I A) figure out what it is and make it work or B ) swap harness with the ECU I using and just make it work with the rest of the car. Or Z) just throw an MS3pro and call it a day?

[Slartibartfast]

ECCS is not a separate component, it's just what Nissan called the whole engine control system (computer, injectors, sensors, the lot). The "ECCS control module" is just the ECM. There's an ECCS relay, controlled by the ECM, which sends power to the injectors, the cam position sensor, the MAF, and one of the evap valves. That diagram's on EC-11 of the '97 manual. I don't know what model/year your donor is, but the '02 Xterra diagram looks quite similar, except that they renamed the ECCS relay as an ECM relay, and it doesn't control the injectors anymore.

 

IMO the deciding factor is gonna be how much stupid stuff like that Nissan changed between the two computers. Compare the pinouts in the service manuals. Hopefully they're close enough that you can get away with a little repinning. Maybe steal a few pins from the donor connector to get that boost solenoid hooked up. I remember My1Path doing something similar to put an M30 ECU in his WD21, but I don't think I've heard of anyone doing it on an R50, so you may be the first pig through this chute.

 

If they're stupid different, or the connector itself is different, or you're planning to hot rod the engine past the donor's original power, then the Megasquirt might be the way to go.

 

11 hours ago, Strato_54 said:

(MAP, nah, Absolute sensor!)

 

My personal favorite is Automatic Speed Control Device, aka cruise control. 

[Strato_54]

Well I just got back from pick n pull and have an 02 xterra ecu and the plug. I just cut it out of the vehicle but have enough I can probably just solder to the SCB wire. The charger and everything was already gone out of the car so no SCB valve  I also didn't get a whole donor car just the vg33er long block on market place like 300+km away. Shout out GFSS auto shop the kids did great pulling that engine lol. 

 

The wiring does seem to be similar it's just the over all plug layout that changed. Based on the ECU pin out sheets on both the 97 and 02 xterra they share the same sensors and the voltages seem to all be the same too so I should have no issues with that. The crank and accessories however.... I think i'm going to see if I can swap my pulleys to be able to run my factory PS, Alt and AC but with the ER pulleys. not sure if it will work yet just an idea but if I had to run the ER accessories oh well. 

 

Definitely going to be one of the only people with a boosted Pathfinder, let alone an SC swap. I've only seen old posts of people talking about it but never actually followed through. I have the parts, I just need the time and the rest of the know how! Im also still waiting on the Cam shop to finish my VG30 cams so with those and a charger, it should make some pretty good jam and I'm very excited!

Edited Sunday at 03:25 AM by Strato_54

[Strato_54]

Also, any Ideas on how I can cover the hole I will have to drill in my hood and not make it look stupid? I might try and give my hood the same bump the xterra has but im not sure yet. still got a way to go before I get there though