PAS Relay

Re: PAS Relay (Matts_SW20)

Sun, 08 May 2016 15:53:36 GMT

Falcon
Is there some reason not to use the solid state 100 amp relay as suggested originally by Knightrous ?

No real reason, I prefer to use something that has been proven to work on a SW20 and I know Nik's car has had it running reliably since she first encountered the issue. Having said this the other one would probably work but my selection was based on personal preference.

Re: PAS Relay (Falcon)

Fri, 06 May 2016 06:22:04 GMT

Is there some reason not to use the solid state 100 amp relay as suggested originally by Knightrous ?

Re: PAS Relay (Rob)

Thu, 05 May 2016 08:54:02 GMT

mr2ben in the UK sells secondhand 1s that where I bought mine from

Re: PAS Relay (Guest)

Wed, 04 May 2016 20:28:41 GMT

89655 from memory of the image - top part - round with four parts coming out of it :)
Learning how to upload an image :) lol

Re: PAS Relay (Guest)

Wed, 04 May 2016 20:15:40 GMT

Update the Toyota schematic of the parts refers to the item as a the power steering brush.
You're responsible for your own actions and this is a mechanical summary of the service to a HE power steering not working; as in the MR2. I have done to my and other vehicles and solved the problem.
Best to refer to the BGB for detailed support. Another resource is the parts schematic of the power steering electric pump, looking for the power steering pump brush.
Summary below;
Remove key from ignition, disconnect battery.
Front trunk, locate on the left side of the battery the electric power steering pump, it has a black rubber cover. Lift the black cover and there will be four black nuts around the outer rim /side of the pump, all at 90 degrees to each other around the pump. Remove one black nut at a time (approx 17 spanner from memory). Remove the black nut Slowly and carefully, there will be a spring to the back of the nut and a small metal end. The black nut / Spring / metal end is now known as the electric power steering pump brush (that is its real name) aka what I called bushes. The metal end will have a concaved end. Take smooth sand paper (180 grit) and wipe the concave surface. Some say spray electrical contact cleaner, however I have just wiped with sandpaper, and do not like to introduce chemicals. You may find grooves in the end of the metal, try to smoothen lightly. Do not try to sand away the metal piece in changing its shape, you are only refreshing the surface. If you have ever sanded the contact points in a distributor cap, this is similar application. Wipe with a clean cloth. Put the brushes (metal part with the spring with the nut end) back in the pump.
Repeat for all four "brushes (black nuts/Spring/metal end).
Repeat the crucial, handle one at a time with care. Replacing the electric pump is at a similar cost to GOLD - ridiculously expensive for what it is - take care in the above.

Re: PAS Relay (robk)

Wed, 04 May 2016 20:01:02 GMT

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

Re: PAS Relay (Matts_SW20)

Wed, 04 May 2016 19:07:52 GMT

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

Re: PAS Relay (Guest)

Mon, 02 May 2016 18:17:38 GMT

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.

Re: PAS Relay (Matts_SW20)

Mon, 02 May 2016 18:13:32 GMT

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

Re: PAS Relay (Nik_Lee)

Thu, 06 Aug 2015 09:28:37 GMT

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.

Re: PAS Relay (Nik_Lee)

Thu, 06 Aug 2015 09:05:49 GMT

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.

Re: PAS Relay (tiff_lee)

Thu, 06 Aug 2015 02:42:38 GMT

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.

Re: PAS Relay (Guest)

Wed, 05 Aug 2015 19:23:44 GMT

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.

Re: PAS Relay (WHITCHY)

Wed, 05 Aug 2015 17:54:03 GMT

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!

PAS Relay (Nik_Lee)

Wed, 05 Aug 2015 10:21:33 GMT

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