i have searched and used the s14 sr to s14 wiring diagram, zerothread?id=219319, i can't get the ecu relay to come on i wont think it will ground, so it makes my fuel pump and no spark if any one that can help it would be nice. please pm me o i have a s14 sr WC ecu and i have a 95 s14 that once was an auto, if you could send me pictures of your s14 sr20det dash plug it would help me out alot, thank you

are you sure that your powers and grounds are right for the relays ???

Make sure that the Red wire is wired up to Pin 9 of the dash plug. Then make sure you have continuity from Pin 1 of the relay base to Pin 15 of the ECU. That's the ground complete for the ECCS relay to complete the selenoid circuit. The ECU grounds that circuit out when you turn the ignition switch on.

However, I have a feeling the problem lies in the Black/Red wire. On the KA harness, it goes to Pin 1, but on the SR harness it goes to Pin 48. Page 814 of the S14 SR service manual has the pinout for the dash plug. The foldout section of the '95 S14 KA manual has the same pinout for the KA plug.

In the thread you linked, I can already see quite a few incorrect pinouts listed. He listed Pin 11 being the spot for the fuel pump signal (Black/Pink wire), but it's actually Pin 27 of the KA plug. It has to be wrong because he listed Pin 27 as the spot for the wiper int signal, and someone had an issue with the wipers coming on when he truned the key to "on" which would energize that wire.

thank you for the reply, i dont think im getting power to the ecu? idk if you would mind sorta guiding me through the wiring? but if not what are the ecu power wires and were do they hook up to?

thank you

Red should be a constant 12v power source. It's a backup power line that keeps the ECU powered so its memory isn't erased.

Black/White is a power supply wire coming from the ECCS relay.

Black/Red is the ignition switched power. It should come directly from the ignition key switch.

Red/Black is a ground complete for the ECCS Relay. The ECU grounds it when the car is turned on, and it in turns activates the ECCS relay to power the Black/White wire.

I didn't want to post this up yet, because it's very incomplete, but It should help you since the one you were looking at is very wrong.

You will need to download both the '95 240SX FSM and the S14 SR FSM. Both have the pinout diagrams (I listed the pages in my previous post). The format of my notes goes like this: Pin#/Wire Color/Function. And in case you didn't know, a standalong L stands for Blue.

S14 SR20DET Dash plug1 PU Wiper Amp INT VR out2 L/Y Wiper Amp INT SW Out34 Y Auto A/C Unit Thermal Transmitter5 Y/G Speed Signal from cluster67 8 G/B Data Link SCI RX In9 10 B Data Link Ground11 12 G/OR Neutral Position Switch (M/T only)13 G/Y ABS Actuator Selenoid Valve Relay14 L/R Combo Meter Warning Lamp15 G/W Data Link SCI CLK16 G/B Turn Signal LH17 G/Y Triple Pressure Switch18 G Data Link SCI TX Out19 G/R Data Link Check20 OR/L Cooling fan Relay 121 L/R EGR and Canister control22 LHD B/P, RHD B/Y Fuel Pump Relay selenoid complete23 B Ground Boost Pressure Sensor24 LG/R AVCC Boost Pressure Sensor25 R Power to Therm Control Amp26 L/G Cooling Fan Relay 227 OR/B LHD Wastgate Valve Control Selenoid circuit complete to ECU28 OR Data link from Combo Meter malfunction light29 BR Power to O2 Sensor for heated element/ RHD Power to Wastegate Valve Control / Powerto VTC Selenoid30 OR/L ECU Start Signal31 B/Y IACV ACC Power32 R ECU Backup power and ECCS Relay power3334 BR 35 B/W CAS Power36 B/W CAS Power (Possibly W/B if from EU)37 L/R Relayed Power to IACV FICD selenoid and to A/C Compressor38 W TPRES Boost Pressure Sensor39 W TPRES Boost Pressure Sensor40 B/R Ignition Power to Ignition Coil Relay Gated Side (BR on EFI Harness side) p291 Has pin 40 as a R/L for RHD models in conjunction with power to fuel injectors. LHD shows as B/R41 BR OFF and INT Wiper SW in42 LG/R Wiper Low43 LG/B Wiper High44 LG Wiper Power45 P Wiper Amp WasH SW out46 47 L/R Auto only Rear Defogger48 B/R Ignition Switched ECU Power (Possibly BR according to FSM PDF page 240)

NOTES: Power Steering Oil Pressure Switch stays on the EFI harness as a Pu/WA/T Neutral Sensor is relayed through the ATCU. It is sent to the ECU along a R/G wire to the same ECU pin of 44

1995 240SX Dash Plug1 B/R Main Ignition Power2 B Ground3 L/R Rear Defog4 P Wiper Amp Wash SW5 LG Power Supply Wiper Motor6 LG/B Wiper Motor High Ground Complete7 LG/R Wiper Motor Low Ground Complete8 BR Wiper Amp Off & Int SW9 R Backup Power and ECCS Relay power10 BR Power to IACV AAC Valve/EGR Canister1112 R Data Link13 Y Data Link14 G Data Link15 G/W Data Link16 Y/G Vehicle Speed Sensor17 OR/L Cooling Fan Relay 118 L/B M63 side; Y/R F3 Side Tachometer signal19 L/Y Wiper Amp INT SW20 Y Water Temperature Guage21 L/W IACV / Ambient Temperature Switch22 OR Malfunction Indicator23 L/W ASCD Actuatuor Power24 L ASCD Air Valve2526 B/Y IACV27 B/P Fuel Pump Relay28 293031 PU/W Power Steering Oil Pressure Switch32 Y/B A/C Thermo Control Amp33 Y/L 5th Position Switch34 OR Start Signal353637 Or/L Recirc Relay38 G/B ABS Data Link Connector39 G/OR TPS (Auto WOT)40 G/OR Neutral (Manual model) (A/T model has R/G wire going to ATCU)41 L/G Cooling Fan Relay 242 PU Wiper Amp INT VR (SE)43 B/P IACV / Triple Pressure Switch44 L/R IACV FICD Selenoid Valve45 OR/B IACV / Triple Pressure Switch46 OR/L A/C Thermo Control Amp47 G/Y ASCD Release Valve48 L/B ASCD Vacuum Motor

ok thanks for the post but for the fuel pump relay the black and pink on the but the sr harness dose not have a black pink wire for the fuel pump? thank you for your help.

would the stock alarm cause any problems?

If you read my notes, you would have noticed it says "22 LHD B/P, RHD B/Y Fuel Pump Relay selenoid complete" My notes were made as I read through the servcie manual, so they're not refined, and I have all possibilities listed in the manual. But if you read from that, it's a Black/Yellow. You should be able to find it coming from Pin 18 of the ECU.

I really suggest you go download the FSM. You need to learn to be self-sufficient on these matters, and that's easier if you have the factory wiring diagrams to reference to.

thank you for your help, i just had to make my own grounds for the eccs relay and fuelpump relay and it worked like a charm thanks for the wiring help, but if anyone needs help pm me and ill be glad to help yal thanks

hey man im having the EXACT same problems in my swap...hit me on AIM when you get a chance: Jake0686

nice info..

I don't know how old this thread is but Im going to need this in a week. Im swapping a zenkie sr20 to a kouki s14.

To efinirx7: you will need FSM for your car because Zenki and Kouki 240sx's F3 plug is wired a little different. Also if you're planning to boost more than 9-10psi upgrade the clutch on your SR.

^ Thanks for the info. I found a kouki fsm the other day. I also have a exedy stage 2 clutch from my KA but I don't think the pressure plate will work only the disk, right?

EfiniRX7 wrote:^ Thanks for the info. I found a kouki fsm the other day. I also have a exedy stage 2 clutch from my KA but I don't think the pressure plate will work only the disk, right?

Hey! Were in the same boat.

Drop me an email PLEASE. I have a feeling I will look at the wiring and soil myself. Because I am NO good at tracing problems electrically. And never had to re pin a plug in my life. I should be getting the motor within the week also.

P.S. email is [email protected]

I just wanted to let you guys know that I was trying to use this info to help me wire up my SDS on my 1995 S14 chassis (actual date of manufacture is oct. of 1994) and it doesn't exactly match up with what is listed here.

All of Bart's colors and descriptions are right, but apparently the wires are moved around to different pins on the early '95's.

On a mine, pin's 1-8 are the same as are pins 33-48, with the only exception being that pin 2 doesn't have a ground on it.

What Bart has listed as pins 9-24 are actually pins 17-32 on mine. Also, the pins that Bart has listed as pins 25-32 are actually 9-16.

Once again, I think this is for the early 1995 model year ONLY!

Hopes this help out somebody else.

I just finished wiring mine up. The weird thing is on my SR dash plug I am missing 40. The wire dose not exist on my plug. Another weird thing is my 46 was located at 44 or something. I only have a B/R with a L/R spliced onto it, where you should also have another wire(think it's BR) spliced into the B/R. I only have one wire connected to the B/R, the other pin dose not exist in my plug. I will get my engine in this weekend, and see if my wiring is correct.

OK, I figured out what's up with the pin numbers.

If you go through every diagram in the FSM for the dash plug and write down the color, pin number, and description, you get the list that Bart put together. Something is wrong with the FSM though, because, at least on my car, those colors don't actually end up at the pins that are numbered out for that plug in the foldout.

Regardless, it's not hard to figure out what goes where and all of the color/description combo's are correct.

It wouldn't be the first time something like that happened. I know there is a typo in the FSM for the CA18DET for testing the ignitors that I'm almost positive is wrong.

Sorry for hijacking the thread, but I have alot of non thread worthy questions. I have a question that is kinda strange. My engine has the stud, bolt combo for holding the valve cover down(zenkie engine). The vin tag from the car my engine is from says it's a 98 engine. The ecu and wiring harness also says my engine is a 98. Why dose the engine say it's a zenkie, but wiring, ecu, and vintag say it's a kouki?

im having trobles with the black and pink wire, its not sending power to the fuel pump relay so my fuel is not working does that mean my ecu has a problem?