I have found various references to the wiring requirements of the AP1 crank sensor but cannot find anything definitive here.

I am working through the wiring for a Link Monsoon and have found at least three conflicting pin instructions on the interweb.
I have a plug wired to the sensor on the engine (hasn't been near an S2000 for some time) with male pins and black, blue and white wires (to the sensor).

I have seen reference to using two of them as sensor grounds (odd), one being redundant so just need two wires (odd) and reference to live, ground and signal to ECU which makes sense to me but is that 12V or 5V live and in what order?

Thanks in advance.

 

I just had a look at my spare sensor, I remember it was kind of odd when I removed it.
The sensor only use blue and white wires, black wire is used as shielding which stops a few inches from the sensor.

 

Thanks Flanders, apologies for the delay in acknowledging your help. Work keeps getting in the way. You don't happen to recall the blue and white wire routing after the terminal at the front of the engine to the ECU do you - one to the ECU signal and one to ECU as ground / earth presumably but which is which?

 

Think white is signal wire,but best to confirm.

 

Yes white wire is ground

 

Brilliant, many thanks for the wiring diag - where can I get an S2000 AP1 engine wire diag from? So they use a different ground colour for each sensor - white, black and red - makes so much sense I don't know why I am confused. I assume the dotted line is shielding as its seems to be associated with the trigger / +ve lead but the cam ones route to a different labelled place / terminal than the crank - I assume these are engine ground (not ECU ground) hence why some references have referred to the crank having two grounds.

 

oh ok,was thinking back to my wideband install ..i knew Flanders would know

 

I think I have my LINK Monsoon G4X ECU pinout table correctly (optimist) identified now with crank, cam, temps (oil, air, fuel and water), injectors, coils, lambda, tps, tacho, fuel pump relay, and some dash lights. Of the 34 pins (Plug A) I have 7 unassigned.

When this eventually gets hooked up to the real engine I will publish the pin assignments (assuming it runs and doesn't fry stuff).

 

Diagram was from 2000-2008 service manual, you can find it and many other useful documents here.
https://s2000.club/