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Where Is The Power Steering Ecu?

GTRNUR

By GTRNUR,
in General Maintenance

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GTRNUR Grand Master

GTRNUR

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Posted (edited)

I'm having hicas/power steering issues and want to measure the signals going to the power steering ecu to trace the problem. I know the hicas ecu is on the under side of the rear speaker panel.

Where is the one that controls the valving etc for the variable rate steering in the front of an R32 GTR?

The problem is that the steering is light when started, and even when driven up to 80-100k's, but after 15-20 seconds it goes firm and doesn't return to light again till after the car is stopped and re-started.

I know its a wiring issue, its just a case of which wires... I have the gtr service manual but it doesn't detail the colours of the wires to check for power steering and hicas. So if i am going to use the service manual at all i have to meter signals directly off the ECU's.

Any help would be appreciated.

Cheers,

Ian

Edited by GTST4Newbie
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vidospace Mentor

vidospace

Posted
Posted

I have the same issue. I am ditching hicas for a lock bar. Check the threads on HICAS bars and you will be convinced. I got a lock bar on this forum for $120 including postage. They are going on Ebay for a similar amount.

Bar will save you such headaches, is reversable, gives more predicatable cornering, and saves between 25 and 30kg of weight!

colgf Enthusiast

colgf

Posted
Posted

The Power Steering variable speed signals come from the main ECU of the vehicle- located behind driver side kick panel. These signals are modified to the Hicas (if fitted) via the Hicas ECU under rear parcel shelf. There is no separate ECU alone for the Power Steering. Another thing controled by the Main vehicle ECU is the timer for the rear window demister ( which often stuffs up ) the only cure is to replace the Main ECU of the vehicle. My advice is lock out your Hicas (nothing but trouble) by removing the plug from the Hicas ECU & fitting a HICAS bar to the rear wheels. Have you cleared the fault memory from the Main ECU lately!!!!! (Disconnect battery for about 30 secs then reconnect) Should clear any fault codes & may fix your problem...

GTRNUR Grand Master

GTRNUR

Posted
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Posted

There has got to be more to it, becase my power steering worked fine with the variable rates etc WITH the factory ecu located in the BIN!

I will try unplugging the hicas ECU, it is probably that alone thats causing the rate to go heavy all the time.

Anyone know much about the variable rate systems? It seems to feel like 2 rates only, and that plus wheel castor and road speed provide the "variable" feel as is shown in the service manual in the power steering section.

Any thoughts?

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