Originally Posted by JLeighs

Hi,

Well, where do I start, I have recently bought the car it had the check engine light on. So, following the recommended actions, bought an ODBII reader and yes, a P0410 error, I did all the initial testing and even bought a vacuum pump to test the pipework. I diagnosed it down the RCM (Secondary air pump as it worked when you put 12v across it but never powered up when starting the car).

So I bought a second hand RCM which I was told had had the re-solder done, upon checking, sure enough it had. So, with much hope I unplugged the old RCM, plugged in with the new... Oh dear, no crank and a couple of other spurious things happened, as I tried to crank the car over, the rear wing came up followed by a couple of seconds later, the cooling fan came on... Hmm even worse mess.

After poking round with a meter, I was able to deduce that the fault with my original RCM was due to the fact that someone had tired to do the re-solder on the three pins and managed to introduce a short between the middle and the outer pins, so, having cut the join, it looks like I have potentially fixed the original error as the secondary air pump now turns on as it should do for the first 30 seconds. Hurrah!!

Now, why am I letting you all this... Ideally I would like to get the faulty RCM fixed and in to my spares bag. So, where should I start looking, any assistance would be greatly appreciated. When turning the key to position III (I think, dash lights on, just before start) none of the relays set, having operated the now fixed RCM, it looks like the middle 3 relays should initially click over, so I think it is something like a common earth or component, could someone please point me in a direction to look.

I am happy to send the unit to our forum guru @tighed1, only I am in the UK and worried it may get lost in the courier system between here and there.

Any assistance would be greatly appreciated.

Many thanks.