Wiring Help - Please

[scannon]

I'm in the process of wiring up an '04 Caterham SV with a Miata engine. I have wired in the Link ECU and am in the process of marrying the Link harness with the Caterham loom. I have a couple of basic questions.



The assembly manual wiring diagram that came with the car does not match the connectors on the car. Someone sent me a pdf of connector pinouts (see http://www.cardomain.com/ride/636168/16) and there is one connector on there (C2) that matches the large connector on the car. I need to know if the diagram shows the connector from the cable side or the connector interface side. The factory assembly manual's wiring diagram says its pinouts are from the cable side, the one with the actual connector on it doesn't give any info about that. Does anyone know which it is before I smoke some expensive parts?



Can someone tell me which relays are which under the dash on the passenger side? There are 5 or 6 of them aligned vertically. All look physically the same except the 2nd from the bottom which is larger than the others.



Thanks,



Skip

[SR27.Seth]

Nice car!

I've never heard of this Miata engine management system before, are you installing this because it gives 'tuning' control over the Miata lump? 1992, that is still a 1.6 liter OBD I, right?

I my experience with wiring diagrams, they usually show the terminal at the ECU end, as if you would back probe the connector if it were plugged in. But to be safe is there any way to test at least one of the connectors, maybe from a continuity test of the ground?

[scannon]

Seth,



The Link is a stand alone ECU that completely replaces the factory ECU. It gives control over fuel and timing in 96 zones as well as control over most other functions of the engine such as temp to turn on the fans, electonic boost control, RPM limiter etc. It also has a knock sensor that will pull timing when the knock exceeds a threshold you can set yourself.



I use this system on my turbocharged Miata and it works well. The tech support from Flyin Miata is great, you can datalog a map, email it to them and receive a revised map back usually the same day or you can tune yourself with a keypad or laptop.



The engine I am using in the Caterham is a 1.8 liter from a 2000 Miata. The 2000 is an OBDII engine but with the new kit car law in Colorado, I do not have to meet smog although my Miata with a much more modified 1.8 engine easily passes the smog test here (chassis dyno type test).



I did some tracing of the circuits and determined that the connector is shown as looking from the wire end as you suggest in your post. I have about 3 wires to go and the ECU will be completely wired as well as integrated into the Caterham wiring. Then the testing starts to see if I did it right.



Skip