So I have had a couple of occasions now when my power steering has not engaged after starting the car due to the PAS relay starting to play up I have so far been able to correct it by cycling the key to brake up the contact corrosion in the relay but this to me is not a fix.
I contacted Toyota about purchasing a new relay and they told me the part number for the relay had been updated but has now been discontinued, this had me thinking maybe it would be possible to wire in a conventional relay as long as I was able to find a relay of the correct amp range. 
I have had a look in BGB and found a wiring schematic which it looks to use a NO relay but I have not found what amp relay I would need, Has anyone else here looked into this and by any chance know what amp relay is used in this circuit or has anyone else found a relay from another vehicle that could be used.
 
Cheers

I swear I've read a more detailed replacement guide on MR2OC before but I can't find it?
 
Check this post out - http://www.mr2.com/forums/threads/97017-1994-MR2-power-steering-problems/page2 
 
Someone has replaced it with a standard 4 pin relay, it also mentions towards the end the factory relay is 80A.
 
Have fun!

I might have a spare relay, as I bought a relay and power steering ecu.  
 
I had a similar issue with power steering sometimes working.  The fix ended up being; removing the brushes and giving them a quick rub with sandpaper.  Also check your speed signal.

Open the relay up and inspect the contacts, try and remove excessive pitting with sandpaper/emery cloth.
 
I haven't seen the relay before and no doubt it isn't intended to be 'opened up' but that's never stopped me before when repairing bespoke relays.

I might have a look and see if I can disassemble the relay and clean up the contacts, I was of the assumption that they were a sealed unit. 
Otherwise I will have a look into other options.

WHITCHY
I swear I've read a more detailed replacement guide on MR2OC before but I can't find it?
 
Check this post out - http://www.mr2.com/forums/threads/97017-1994-MR2-power-steering-problems/page2 
 
Someone has replaced it with a standard 4 pin relay, it also mentions towards the end the factory relay is 80A.
 
Have fun!

Hey Whitchy
 
I had actually read that post when my power steering first played up that's how I got onto cycling the key initially I missed the fact that it was an 80amp relay though so thanks for that.
 
I found this that may be an option for a replacement as it is designed for high current draw,
https://www.elite-electronics.com.au/In-Car_Entertainment/Accessories/Capacitors/Stinger_SGP38_80_Amp_Battery_Isolator_and_Relay
 
I think it would be a better option than just using a regular 80amp relay due to the current the steering pump would draw.

Have purchased that relay that Nik_Lee suggested, will install it shortly. 

Give the four power steering bushes a very light sand (few wipes like cleaning it) whilst you have it disconected from power/battery.  My power steering wouldnt come on previously (intermittently), replaced the relay and ecu - ended up being the bushes needed a slight clean / sand.

Can you take a picture of said bushes? When you say power steering bushes nothing specific comes to mind.

I assume he's referring to the bushes in the PS motor?