ca18det wiring harness

[30psi]

The 3 relays there are for the ECU, power transistor (the silver square box) and the fuel pump.

No need for another relay

[northerner]

Originally Posted by 30psi

The 3 relays there are for the ECU, power transistor (the silver square box) and the fuel pump.

No need for another relay

OK I will maybe use the space to tidy up my relays for radiator fans.

Any idea which pin on the relay I should use for the Fuel pump wire (Black/purple on the Brown plug). I take it this will be the fuel pump trigger wire from that comes from the ECU ???????

[30psi]

I'd have to check on a wiring diagram whether the ecu earths out the relay or puts power to it, but I think all you need to do is connecting the output from the relay to the fuel pump.

[northerner]

OK bud I'll await your reply. I had a look at the butchered loom today and cut off loads of multi-connectors to make the job neater. As the start signal on the s12 (black/yellow wire) is under the AFM, I will have to run the orange wire (white plug by the ecu plug) back down the loom to join it up.
I'm also wondering why Nissan put the knock sensor wire on the alternator wiring instead like the silvia on the Engine loom??? Maybe too much interference.

[CamInHead]

the 'ET has a knock sensor ?

I is lol thicko etc

[northerner]

Originally Posted by CamInHead

the 'ET has a knock sensor ?

I is lol thicko etc

Yep it does also called the Detonation sensor. I believe the Ecu backs off the timing by 5 degrees upon the onset. Silviagod has made use of the sensor on his car

[northerner]

Originally Posted by 30psi

I'd have to check on a wiring diagram whether the ecu earths out the relay or puts power to it, but I think all you need to do is connecting the output from the relay to the fuel pump.

Having checked the S13 fuel pump relay, the black/purple wire is the Power/trigger wire that comes from the ECU. I now have to extend that from the white plug to the boot. I have now wired in several OE connectors to the larger (12v perm and switched wires and made up my three relays. It will simply be a case of plugging in the connectors when the engines in.
I do however have a couple of wires left to do :

1. Is Orange start signal wire from the White plug (by the ecu) that I have to re-route down to the Brown/grey connectors as the start signal on the S12 (8 pin under the AFM Black/yellow wire).
2. The Neutral switch. I know its the Green/Orange wire (brown plug) but I cant find the corresponding wire.

[northerner]

2. The Neutral switch. I know its the Green/Orange wire (brown plug) but I cant find the corresponding wire. [/quote]


Found it courtesy of club-s12 :

http://www.club-s12.org/forums/index...neutral+switch

The neutral switch on the CA which is green/orange goes to the neutral switch on the s12 harness which is also green/orange

[northerner]

I know from the How to thread that you add the Four diodes to the coil pack wiring. Problem is which wire on each coil pack do you T-off from ? Its apparent the one on the Left but on the left when you look at the plugs which way round ??? The picture I've taken shows no.4 which has (from L to R) thick Pink thick White and tin Black. The others have similar wires from L to R with different colours.
Anyone help me out

[30psi]

It's the one on the left when you look at the rear of the plugs. I can check on my loom if you want before you do it.