Jump to content
SAU Community

Recommended Posts

Hi All.

Currently have a problem with my Oz delivered R32 GTR. After you have been drinving for Approx 10 min the Hicas light comes on and then the steering will slowly get heavier until there is no power assist. If you then turn the car off and restart it, It will be ok for another 10 mins and it will do the same thing. I have Changed the power steering fluid I have also had the pump off (Fun job) and tested flow rates and pressures and all seemes to be ok. I have also completed all the self tests that are in the Nissan work shop manual and are unable to get any fault codes out of it. The strange part is it only started doing it after I installed a 320kmph Nismo speedo. Haven't had a chance to swap them back yet but that is next in line.

Any help or ideas would be great. (Not much fun when you can't steer them)

Cheers

Craig.

Link to comment
https://www.sau.com.au/forums/topic/78685-hicas-light-and-heavy-steering/
Share on other sites

Craig generally the HICAS error light comes on when the steering wheel is not on straight, did you remove the wheel when you did the dash? Try a search for "HICAS +light" you will find plenty of other threads about this

You may have disturbed the vehicle speed sensor (VSS) wire to the HICAS controller - that is sourced from the dash in a R32.

The HICAS controller waits for a certain amount of time (and/or a certain set of conditions) for a VSS input, and then if none is detected the HICAS light comes on and the power steering (which the HICAS controller also controls) defaults to no/minimal assistance. Sounds like this is what you are seeing to me.

I thought that the controller throws a fault code saying that the VSS signal isn't present, but as you aren't moving in diagnostics mode then it may not as it has no way of knowing if the input is good or not.

Do a search for HICAS vehicle speed sensor, there have been a few threads just recently on this topic. The short version is test the VSS input to the HICAS controller, and if it isn't working, work your way back thru the wiring until you find the problem. If the VSS input is OK, then ignore everything I've said!

And in your case I'd definitely check the dash wiring, especially the VSS feed from the dash to the ECU, which I believe branches to the HICAS controller.

Also I believe that the HICAS controller has a tacho input as well (used for power steering control), not sure what happens if this is not present but as it is related to dash stuff that could also be a possible source of the problem.

Hey

Another possible cause includes the battery voltage. If the voltage drops below a certain level the power steering shuts off and hence hicas light . Go to batteryworld they check the battery under load for free.

The battery should be beween 13-14 volts when running no accessories

Hey

Another possible cause includes the battery voltage. If the voltage drops below a certain level the power steering shuts off and hence hicas light . Go to batteryworld they check the battery under load for free.

The battery should be beween 13-14 volts when running no  accessories

Yeap, that happened in my GST-T, turned out to be dodgy wire between the alt and batt so it was recharging properly. Power steering used to shut off and some REALLY inconvenient times (mid-way through a corner).

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Hi. This is just my curiosity because iam sure the tuner figure something out...but either way i want to ask. The "problem" is that the Nistune ECU (Stagea FW and RB25DET NEO from Stagea) sees many times the speed than the speedo does(he says the speedo show 120 km/h - correct speed and the ECU shows like 510km/h ) I told him that this car/tranny getting speed from rear diff. If iam not mistaken the RB25DET NEO "need" to see tranny speed sensor? (my tranny has the plug for it). So couple of "question" If he connects/wire the speed sensor to the tranny...are the signals gonna intervene and if...what if he disconnects the rear diff one and the speedo stops working? Or the "new" sensor from the tranny "take over" and will not going need the one from diff? As i said i know he figure/get that done...iam just curious to know what are the solutions 🙂 
    • Your IACV is set to idle too low. You need to adjust it via the screw Duncan mentioned. From memory it should be 650rpm with the valve electrics unplugged. What is it trying to idle at with the IACV plugged in?
    • Ahhh, I need the whole head unit. I definitely needed to roll back through and review your setup, ha ha! Neat setup they have going on. I just need a full double din head unit. But I want good and responsive. I might have to review what the likes of pioneer have out these days.
    • Ok so after much research and talking with knowledgeable people I've got my turbo conversion done and it's all running great other than 1 small issue.  Car has remained auto with the na auto and tcm, I've used a stagea ecu with. NIstune board and everything is great other than my gear selection on the dash. It illuminates park, reverse, neutral, 3rd and 2nd. But nothing drive or what gear your in when you pop it into tiptronic.  I'm sure there is may e 1 wire in the ecu plug I need to move to rectify this. Dose anyone here have any ideas?   Cheers guys
    • Sorry I haven't been following all the detail, so you may have tried this. Does it idle with the tiniest bit of throttle you can add? You've mentioned the IACV, does it have an AAC valve and have you adjusted it at all (ie, screw the idle adjust screw all the way in, then back it out a couple of turns until idle is stable)?
×
×
  • Create New...