Pic request: S5 Jspec harness
06-16-11, 07:51 PM
#1
Junior Member
Thread Starter
Join Date: Jun 2011
Location: Willow Springs, MO
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
Pic request: S5 Jspec harness
Apparently people that haven't posted yet on this forum don't know anything about rx-7's so I have to post this in the wrong section.
I've done a NA to jdm turbo swap on my friend's S5 using the jdm engine harness and Rtek 1.5 chipped N374 ecu. As expected, the n374 didn't fire the rear rotor but the Rtek completely solved that issue and it ran fine afterwards.
Anyway, the jdm harness was intact except it was cut at the pressure sensor wires. I've wired it up to what I think is right, but there's four wires where it is cut, and from my understanding the n370 pressure sensor only uses 3.
I just need a photo of the pressure sensor plug on a jspec S5, so I can see the wire colors
I would greatly appreciate it if someone could post that for me. Thank you.
I've done a NA to jdm turbo swap on my friend's S5 using the jdm engine harness and Rtek 1.5 chipped N374 ecu. As expected, the n374 didn't fire the rear rotor but the Rtek completely solved that issue and it ran fine afterwards.
Anyway, the jdm harness was intact except it was cut at the pressure sensor wires. I've wired it up to what I think is right, but there's four wires where it is cut, and from my understanding the n370 pressure sensor only uses 3.
I just need a photo of the pressure sensor plug on a jspec S5, so I can see the wire colors
I would greatly appreciate it if someone could post that for me. Thank you.
06-16-11, 09:14 PM
#2
I should point out that the Rtek 1.x chips aren't intended for N374 ECUs: http://www.pocketlogger.com/index.ph...age=1&ecu=S5T2. Did you install this chip yourself? Have you called pocketlogger to see if it will even work completely right?
When doing a turbo swap, it is much easier to reuse the existing NA harness. For S5s, this is especially easy. There are details links in the FAQ and my signature.
For re-wiring the pressure sensor plug, if the existing wire colors are the same as the 3 shown in the US FSM, put them in the order shown, and put the 4th in the unused slot or leave it disconnected.
The wire colors in the US FSM are:
Br/B - ground
Br/W - power
G/Y - signal to ECU pin 2H
If the wire colors are different, ground and power will be easy to find with a multimeter. Continuity between pin 2H and the signal wire will give you that one. The 4th would be used for? Not sure. On an S4, there are 4 wires. They're the same as above, and the 4th one ties into the AFM, variable resistor & ATP sensor. The ATP sensor in integrated into the S5 ECUs, the variable resistor doesn't exist, and the AFM works differently, so it may not be needed at all. There are a lot of people using NA harnesses with N374 ECUs, and they only use 3 wires.
When doing a turbo swap, it is much easier to reuse the existing NA harness. For S5s, this is especially easy. There are details links in the FAQ and my signature.
For re-wiring the pressure sensor plug, if the existing wire colors are the same as the 3 shown in the US FSM, put them in the order shown, and put the 4th in the unused slot or leave it disconnected.
The wire colors in the US FSM are:
Br/B - ground
Br/W - power
G/Y - signal to ECU pin 2H
If the wire colors are different, ground and power will be easy to find with a multimeter. Continuity between pin 2H and the signal wire will give you that one. The 4th would be used for? Not sure. On an S4, there are 4 wires. They're the same as above, and the 4th one ties into the AFM, variable resistor & ATP sensor. The ATP sensor in integrated into the S5 ECUs, the variable resistor doesn't exist, and the AFM works differently, so it may not be needed at all. There are a lot of people using NA harnesses with N374 ECUs, and they only use 3 wires.
06-17-11, 06:45 PM
#3
Junior Member
Thread Starter
Join Date: Jun 2011
Location: Willow Springs, MO
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
Rtek does do n374 ecu's. It was installed by them, and fixed the common n374 issue. The Jspec harness was SUPER easy to use, you just have to cut the insulation off and re-wrap. Only one single wire had to be extended. Ended up looking very clean and simple. Except it is missing the windshield wiper portion, but that can be taken off the US harness. This swap was amazingly easy.
The colors do seem to be different on the jspec harness to the pressure sensor. I believe I have it hooked up right, but would like a photo to be sure. I know someone on here has a jspec harness laying around or in their car, but this probably needs to be in the second gen forum for someone to see it. The extra wire is green, it could possibly be for one of those green test plugs mazda seemed to put everywhere.
My friend and I drove to Kansas to pick up this motor that was still on the pallet from japan. The guy only wanted his running na motor and $200. IT was supposedly just a s4 t2 motor. We drove 500 miles, got there and I noticed it was actually a S5 motor and also had a hybrid turbo with a turbonetics compressor and a dual belt pulley. Some people really don't know what they have, and it worked out really great for my friend. I did all the technical work on the car, my friend did the grunt work. It runs like a beast, but runs out of fuel at -5k. I've already wired up the wideband and S-AFC. The 720cc injectors are on order, and the Rtek is about to be shipped out to be upgraded to 1.8 then it should be ridiculously fun.
The colors do seem to be different on the jspec harness to the pressure sensor. I believe I have it hooked up right, but would like a photo to be sure. I know someone on here has a jspec harness laying around or in their car, but this probably needs to be in the second gen forum for someone to see it. The extra wire is green, it could possibly be for one of those green test plugs mazda seemed to put everywhere.
My friend and I drove to Kansas to pick up this motor that was still on the pallet from japan. The guy only wanted his running na motor and $200. IT was supposedly just a s4 t2 motor. We drove 500 miles, got there and I noticed it was actually a S5 motor and also had a hybrid turbo with a turbonetics compressor and a dual belt pulley. Some people really don't know what they have, and it worked out really great for my friend. I did all the technical work on the car, my friend did the grunt work. It runs like a beast, but runs out of fuel at -5k. I've already wired up the wideband and S-AFC. The 720cc injectors are on order, and the Rtek is about to be shipped out to be upgraded to 1.8 then it should be ridiculously fun.
