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R32 power steering Light/heavy


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Firstly is it even the diagram I should be referring to ? 
My model year is 1990 gtst 

If yes, pin 8 in this diagram is the final variable voltage as per speed going to the solenoid? And also it goes to the consult port for the what ?

I mean that’s what it looks like, but I am not to sure if it could be going to elsewhere?

Also pin 5 says to ecu I have color matched that wire (brown with silver trace dots) it is wire to one of the connectors that engine/ecu harness connects to but the ecu side of that wire has been chopped so don’t know where that should be on the ecu or can I connect this directly to speedo wire going to pin53 on ecu ? It makes sense to me unless ecu is pulsing that signal or is that signal from speedo already pulsed ?

my only hopes are with you @GTSBoy🙃

also is there any proper wiring diagram on here that could help me 

IMG_6490.JPG

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The ECU doesn't create the speed signal. It is created at the speedo head. That signal is available to all the CUs on the bus that want it (ECU, TCU, ABS, TCS, HICAS, ATESSA).

On that diagram, I can only assume that the "High speed sensor" is the speed sensor/transmitter in the speedo head, and you can see that that wire reports to both the ECU and the HICAS CU on terminal 6 (I think it's 6 - on the RHS up near the top).

The other wire "to ECU" on T5 must be for some signal from the HICAS to the ECU for some other reason. It might be something to do with PS load idle up, or god knows what else.

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I am starting to think it could be your speedo.  I had the exact symptom as described in the flow chart I posted when my speedo cable broke, and my HICAS was untouched.  Is there another GTST local to you that you can perhaps borrow the cluster to test?  It's a fairly quick swap.  

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