From the top, I'm a very experienced (read old) automotive mechanic and design engineer. I've a stock Honda powertrian in an old Ford. My one remaining fault code is this P1411. Has anyone come across it? Thanks either way.

As background, my installation does not have an air pump, and is a UK spec car. I've bought the original airpump relay, and have installed it (temporarily) running the rad fan (as the nearest inductive load - I do not have the airpump). The UK cars do not have the current sensor. Now today, my fan comes on for about about 30 seconds on cold start, but so my my MIL light (about 5 seconds after cold start). I can work around by resetting the ECu and restarting from hot, but it's irritating me.

Thanks again.

 

I'm not sure what P1411 is as that's a non-USDM CEL (we have P0411 but it's not the same).

Do you have the "Air Pump Fuse Box" hooked up? It has a 7.5A fuse for a green wire that the ECU uses to monitor the air pump's operation.
I do not have access to a non-USDM S2000, so I'm not sure what criteria the ECU uses to monitor the system (voltage? current? bounds?) but this is likely the culprit of your CEL.

See the below diagram for an electrical schematic. I apologize for the poor image quality but it's the best I have.



Hope this helps.

Cheers,
Caleb

 

Has anyone got anymore drawings they can post up of the UK wiring relating the the air pump?

I'm getting 5v across the motor/air pump connections and I want to know why.......I think the Vcc runs through the air pump wiring to ensure the air pump is in circuit, then returns to A31. I think page 11-A-14 might be the one I'm after!

I have the US manual but there are some differences relating to the pump.

Anything to do with the fuel and emissions system. Also a drawing of all engine sensor wiring would be great, including the VCC +5v.