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Hot!SW20 Solid State Relay Power Steering Issues

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sussdub
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2018/07/23 21:37:41 (permalink)
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SW20 Solid State Relay Power Steering Issues

Hi All,
 
I have a 91 mr2 with 94 gen 3 3sgte running gear (engine, gearbox, ecu, wiring harness up to kick panel).
 
Ever since I bought the car with the old N/A gear, the power steering light has come up on the dash however Power Steering worked fine. After the swap it continued to work fine for a while until it eventually started working intermittently.
 
The key trick worked for a while, however eventually stopped working at all. I have checked the speed cancelling sensor on the steering wheel which seems to be fine (as per bgb diagnosis), have given the pump direct power to which it turns on, have tried 2 oem relays which both clicked, also tried replacing power steering ecus with ones known to be working, topped up fluid with genuine toyota products however I still had the same problem. When bridging terminals Tc and E1, my power steering light will continuously blink twice every second, indicating no malfunction.
 
I recently replaced my relay with a 100 amp solid state relay as recommended by some users.
Finally, this seemed to have done the trick !
First time since owning the car, no power steering CEL!
 
However, i noticed when leaving work today as I started the car and warmed it up, it was all good no CEL.
As i started to drive for a while, I noticed the CEL had come back on and low and behold, no power steering.
 
I got home, checked the SSR which seemed to be fine (LED still lit). When i turn it on and off it will work, however didn't expect to have this problem with the SSR. Frustrating to say the least, thought I had finally gotten a 100% fix.
 
Does this indicate my pump bushes are worn and perhaps is on it's way out?
 
Any help would be much appreciated.
 
Thanks & Regards,
Abs
post edited by sussdub - 2018/07/23 21:58:59
#1


7 Replies Related Threads

    Knightrous
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    Re: SW20 Solid State Relay Power Steering Issues 2018/07/23 22:27:30 (permalink)
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    When you installed the SSR, did you install a flyback diode?

    TrackDub - 89' AW11 1MZFE | SlushDub - 89' AW11 4AGZE
    #2
    sussdub
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    Re: SW20 Solid State Relay Power Steering Issues 2018/07/24 00:17:31 (permalink)
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    I did not.
    I merely replaced the original relay with the SSR.

    How would I go about installing a flyback diode?
    #3

    sussdub
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    Re: SW20 Solid State Relay Power Steering Issues 2018/07/24 00:35:30 (permalink)
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    From what I've managed to gather from a quick google search " a diode that is placed with reverse polarity from the power supply and in parallel to the relay’s inductance coil. It is used to prevent the huge voltage spikes that happen when the power supply is disconnected."

    Would i need to basically connect a flyback diode in parallel with the relay's inductance coil i.e. the small wires? If so, would you happen to know what rating diode would suffice and how I would go about making sure that it is wired parallel?

    I have studied parallel and series circuits so have a little bit of know how with ohms law calculations and what not but am still learning.

    Cheers for the help,
    Abs
    #4
    robk
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    Re: SW20 Solid State Relay Power Steering Issues 2018/07/24 09:17:13 (permalink)
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    I didn't install a flyback diode either when I changed to a SSR, because I assumed that it's already there, maybe in the motor itself.

    President of the MR2 Club of NSW. 
    There is an extensive build thread for my car here: http://www.mr2australia.com/mr2play/tm.aspx?m=18316
    #5
    Knightrous
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    Re: SW20 Solid State Relay Power Steering Issues 2018/07/25 12:12:29 (permalink)
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    The flyback diode is designed to prevent high voltage spikes generated by the load from exceeding the SSR's mosfet break down voltage (I'd save 60v), which can damage the mosfet. 

    TrackDub - 89' AW11 1MZFE | SlushDub - 89' AW11 4AGZE
    #6
    TonyMR2
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    Re: SW20 Solid State Relay Power Steering Issues 2018/07/29 18:28:20 (permalink)
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    New power steering brushes are expensive last i looked. The brushes in the pump are an easy task to tick off as trouble shooting. They are the four big black bolts around the pump. Do one at a time, remove delecately, end of the spring attached to the inside of the bolt is a metal end. Rub the metal end with some 180-240 grit sand paper on the end of your finger, gentle sanding passes on the face. The action is best described as how you would clean the surface of a distributor points (in the old days). Keep the concaved shape, just clean the brush surface and flatten any lumps. Reinstall and see if it solves it.
    #7
    Matts_SW20
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    Re: SW20 Solid State Relay Power Steering Issues 2018/08/13 12:09:42 (permalink)
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    I might look into this also. I have a SSR and last night the P/S warning light came on despite the power steering performing perfectly. Very curious indeed, might also be worth a fluid transfer. Has anyone had issues where everything has been fine but the light is on anyway? 

    MR2 Club of Australia (NSW Branch) Inc.
    Vice President and Public Officer
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