if you have a 89 240sx and doing a swap please read.

Post by **bias** » Tue Mar 13, 2007 2:07 pm

I may have looked over it, but I searched and everyone says to do the CA swap like the SR swap. Ok, did that but something just wasn't right. I pulled the code on my ECU and it was "34" (knock sensor) I got all stressed out and started looking for prices on knock sensors. $99 to $200. Stressed out big time. Posted to see if I could get someone to tell me a cheaper way out. Then I began to question the swap And wondered if I even hooked up a knock sensor, I remembered cutting and soldering but not in detail. Come to find out the Ka24e didn't have a knock sensor? Well this is my first swap and I tell you it's nothing like doing it yourself. I have learned so much about these cars in the last few months some good and some bad but I know it for myself. For anyone doing the swap or almost finished make sure you wire the knock sensor into the ecu. Some people will tell you it's just like the Sr swap but thats only if your car came with a KA24de.

Post by **Masterdebater** » Tue Mar 13, 2007 2:13 pm

im running without the knock sensor currently cuz i cant find one either loltoo much work for me right now ive got no money.

Post by **ca18datsun510** » Tue Mar 13, 2007 2:27 pm

the wire is in the ca harness. you just have to hook it up.

its by the gray and brown plugs behind the battery. you dont need any of the ka harness to do it.

Post by **r34 gtr** » Tue Mar 13, 2007 4:56 pm

word. ive been running my knock sensor since day one (5yrs). just found the wire where cadatsun said, right next to the battery. i dont know about you guys, but when i got to the wiring part i just had both the ka and ca diagrams on the table next to each other. by the way, mine's an 89.

Post by **Masterdebater** » Tue Mar 13, 2007 6:56 pm

im sure i have it too tho lol..where does it connect to on the block? the green plug?

Post by **float_6969** » Tue Mar 13, 2007 7:30 pm

It connects to the block on the green, single wire plug. It runs through the lower harness and into the chassis harness. This is where there may be a problem. IIRC (and it's been a while, so I could be wrong) the 89/90 S13's not only lacked the knock sensor and the wiring in the lower harness, but also lacked the wire in the chassis harness. This means you would need to run the wire from your CA18DET lower harness to the ECU, or if you're using the KA24E lower harness, you'll have to find a plug for the knock sensor, or soldier a wire straight to the sensor.

I don't have access to a KA24E FSM, so somebody correct me if I'm wrong....

Post by **ca18datsun510** » Wed Mar 14, 2007 12:27 am

you dont need to run it to the ecu.

i dont know who started this aweful rumor, but did anyone bother to check the wire the wire that allready comes out of the ecu? it runs from pind 21 or 23, into the engine bay on the ca harness. you have to connect it from the ca lower harness to the ca upper harness.

i dont remember which plug its in, either the gray or brown behind the battery.

has nothing to do with the original ka harness.

Post by **float_6969** » Wed Mar 14, 2007 2:48 am

You're right, and when I did mine (mine is a 90') I just jumped it from the lower harness to the engine harness.

Post by **bias** » Thu Mar 15, 2007 2:36 am

I didn't figure it out until it was all hooked up. I have so many empty plugs? Just went to the ecu. I will prob rewire it when I get the time. I can't believe how much a difference it made. I Love this engine!

Post by **Masterdebater** » Mon Mar 19, 2007 5:30 am

well what color is the wire coming from the knock snesor?

Post by **bias** » Mon Mar 19, 2007 6:07 am

Did you get the lower harness with your engine? If you did just trace the wire from the knock sensor into the harness it should be gray(shielded wire) One white for the signal and one black for the ground. They should both be together in the gray shielded wire.

Post by **Masterdebater** » Tue Mar 20, 2007 5:04 am

im using the lower harness off my ka...****.looks like i have no knock sensor

Post by **bias** » Wed Mar 21, 2007 7:18 am

Go straight to the ECU. It will be worth it. If you have shielded wire left over from your Ka harness use that. The car is running on lower octane when the ECU is pulling code 34. Hook up the knock sensor. It should be white for signal and black for ground try and match the wire from your knock sensor to extra wire in the KA harness

Post by **Masterdebater** » Wed Mar 21, 2007 3:08 pm

i dont get it tho cuz i dont even have the plug. i have the sensor in my block...but no connector ya know? maybe a pic of what it looks like since i cant find one anywhere on the internet.. im sure it will boost alot better when i have the knock sensor...

Post by **ca18datsun510** » Wed Mar 21, 2007 5:03 pm

bias wrote:Go straight to the ECU. It will be worth it. If you have shielded wire left over from your Ka harness use that. The car is running on lower octane when the ECU is pulling code 34. Hook up the knock sensor. It should be white for signal and black for ground try and match the wire from your knock sensor to extra wire in the KA harness

dude, you dont get it. you know the wire where it comes out of the ecu plug? where you are tapping into? the wire you cut, it already goes into the engine bay as part of the upper engine harness.

you can splice it right in the engine bay and not have to find a long *** piece of wire and run it through the fire wall and all that nonsense.

Post by **ca18datsun510** » Wed Mar 21, 2007 5:05 pm

Masterdebater wrote:i dont get it tho cuz i dont even have the plug. i have the sensor in my block...but no connector ya know? maybe a pic of what it looks like since i cant find one anywhere on the internet.. im sure it will boost alot better when i have the knock sensor...

you can make one. go to the parts store. get a round female connector. crimp a wire in it. put it on the knock sensor. run the wire over to the battery area, and find the wire that already runs to the ecu, and connect it. i forgot which plug its in, either the gray or brown behind the battery.

if i get motivation and time, one of these days im gonna make a ca specific wiring faq type thing.

Post by **bias** » Thu Mar 22, 2007 12:38 am

float_6969 wrote:It connects to the block on the green, single wire plug. It runs through the lower harness and into the chassis harness. This is where there may be a problem. IIRC (and it's been a while, so I could be wrong) the 89/90 S13's not only lacked the knock sensor and the wiring in the lower harness, but also lacked the wire in the chassis harness. This means you would need to run the wire from your CA18DET lower harness to the ECU, or if you're using the KA24E lower harness, you'll have to find a plug for the knock sensor, or soldier a wire straight to the sensor.

I don't have access to a KA24E FSM, so somebody correct me if I'm wrong....

Hook it up like this. I plan on doing it but it was faster and I didn't know about this before. I suggested going straight to the ECU cause it was easy and I did it, and it works. It's up to you. Just keep in mind we are all telling you to wire it up. If you have to jump on climp to the top of a mountain and swim through the ocean to find the mermaid "Just Hook It Up"!lol

Post by **Masterdebater** » Thu Mar 22, 2007 4:45 am

no the thing u dont get, i didnt clip shyt. i bough the motor without the knock sensor in the harness. therefore i dont know which wire to run it to. im not supposed to know which wire exactly to tap into just off the top of my head. now if u can answer m question and just tell/show me which wire it is like i asked, cuz i get what ur saying completely. but yea the round connector thing makes sense. now if anyone knows which wir it is to splice into in the brown or grey plug id like to know. in the meantime ill look for info on which one it is and find a plug to tap into that will work on the knock snesor. thanks for the info datsun at least it was an answer of some sort

Post by **ca240sxcoupe** » Thu Mar 22, 2007 5:06 am

so if my engine came with the sensor in the block and im still using the ka24e lower harness just run the wires coming off of it to the ecu and i shouldnt have to worry about it>?

Post by **bias** » Thu Mar 22, 2007 11:12 am

No you shouldn't. Doing it the other way would be a cleaner way to do it if you know exactly what wire to use. I'm going to take pics to try and get this all understood. Ok I took pictures of the empty plugs I have hear the battery. Which one is the knock sensor wire? [IMG][/IMG]

Modified by bias at 4:42 PM 3/22/2007
Modified by bias at 4:43 PM 3/22/2007

Post by **ca18datsun510** » Thu Mar 22, 2007 3:49 pm

float chime in hear, is it pin 21 or 23? i cant recall.

once float says what pin it is. get out your multi meter and trace the wire. ohm it out. put one end in the ecu plug for the coresponding pin, and then probe the other plugs till you find it.

im sorry guys i dont have a stock harness available to me right now or id tell you which wire it is.

if you dont have a multi meter, you should.

Post by **ca18datsun510** » Thu Mar 22, 2007 3:51 pm

bias

you know the 2 connectors behind the battery you had to do the wiring on for fuel pump etc? the brown and the gray? in one of those plugs there is a shielded wire. if you take pics of the plugs that will help.

Post by **burntricer** » Mon Mar 26, 2007 5:18 am

can i ask a question about this wiring?

when i did my 2.2 to 3.1 swap in my cavalier i just plugged the harness into the ECU, and ran the ECU in the car...im assuming you cant do that in the KA to CA swap?

can someone post pics of where im gunna be cutting/soldering?

or is it something like this

Post by **bias** » Mon Mar 26, 2007 3:23 pm

What year are you doing your swap on? The swap is identical to the sr swap with the exception of the knock sensor wire (240's with Ka24e sohc) Check out the stickies and you should get most of your answers. If you have anymore just post them.

if you have a 89 240sx and doing a swap please read.

if you have a 89 240sx and doing a swap please read.

Re: if you have a 89 240sx and doing a swap please read. (bias)

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