Jump to content
SAU Community

Recommended Posts

I know this topic has been discussed in previous threads, but i cant find the answers i need

My car has been fine until a few days ago, after i stopped at the servo i started my car & noticed the HICAS

light was on & this caused my steering to be heavy. I tried to restart the car & the light stays on

however this is where things get wierd, if i leave the car for a overnight or while im working (approx 8 hrs)

i can start the car & the light will stay off and steering will be normal, but if i was to turn the car off & restart

the light would go on & steering would be heavy again, it seems the car likes to have a rest before it works properly :(

Will driving the car with heavy the HICAS light on & heavy streering cause any damage?

I know a lock bar would probably be the way to go? will this make my steering as heavy as it is with the HICAS light on?

Is there a simple way to fix this? at least until i find the time to fit a lock bar?

i have already tried cleening the contact on the HICAS but with no sucess...

any suggestions??? any input would be greatly appreciated :P

Link to comment
https://www.sau.com.au/forums/topic/243696-hicas-light-on-heavy-steering/
Share on other sites

see if you can do a HICAS diagnostic. it should be able to narrow it down for you. but by the sounds of it, its leaning towards being your vehical speed sensor. it tells the car that its moving and to bump up the pressure to the powersteering system, and it is also needed for HICAS to function. if you just throw a HICAS lock bar in i'd say you'll still be stuck with heavy steering. but yeah, start by doing the HICAS diagnostic and see what it says, there is a tutorial on how to do this in the tut section.

see if you can do a HICAS diagnostic. it should be able to narrow it down for you. but by the sounds of it, its leaning towards being your vehical speed sensor. it tells the car that its moving and to bump up the pressure to the powersteering system, and it is also needed for HICAS to function. if you just throw a HICAS lock bar in i'd say you'll still be stuck with heavy steering. but yeah, start by doing the HICAS diagnostic and see what it says, there is a tutorial on how to do this in the tut section.

Thanks for the quick reply, i think you might be right about it being the pressure to the power steering system, so the speed sensor could be causing the problem, do you know where the speed sensor is located?? i have tried the HICAS diagnostic & the HICAS light didnt flash, maybe i wasnt quick enough??

^^Also check the power steering fluid, Hicas using it aswell.

Fluid level is fine, but i think the hoses need replacing soon...could a slightly deteriated hose cause a pressure drop & HICAS light to come on? I would have thought if there was a leak sufficent to casuse a problem the fluid level would be dropping dramatically?

PS: the car is a Series 1 R33, it also has a Wolf 3D aftermarket computer (plug n' play)

is the speed sensor on the gearbox, speedo, connected to computer??

sorry if this seems like a silly question :P

Take it to your mechanic and get them to plug in the diagnostics computer to trace the fault.

It will pick up all the sensors and give you a reading.

Its just a matter of isolating each point till you narrow it down.

power-steering fluid is only relevant to r32gtst...

im pretty sure 32gtr use super hicas..

which comes standard in 33gtst onwards..

so its done by an KYB motor..not hydraulic!!

correct me if im wrong...

so pwr-str fluid wouldnt have anything to do wit it!

sound lik u need to do an hicas diagnostics..

hey mate ive the exact same problem that you're having. I park my car and get some food, when i come back and start my car the

HICAS lights comes on. I leave it for a long period of time like overnight etc... it goes off, and now it jsut comes and goes randomly its

super weird. Im driving a R33 non turbo, anyone knows how does the HICAS work on this one? Is it fully electronic as well or does it

work with the fluid?

cheers!

hey mate ive the exact same problem that you're having. I park my car and get some food, when i come back and start my car the

HICAS lights comes on. I leave it for a long period of time like overnight etc... it goes off, and now it jsut comes and goes randomly its

super weird. Im driving a R33 non turbo, anyone knows how does the HICAS work on this one? Is it fully electronic as well or does it

work with the fluid?

cheers!

oh good question..lol

well as far as i know..R33 have super hicas..which is the same as as 32GTR..

this runs off a electric motor...and i Nissan used KYB motors...

have a look under ur car and see if you can see these motor on the hicas unit behind the diff...

the motor should have a sticker on it..

sounds like u need to run a diagnostics..there is a way to do it..just search...

  • 4 weeks later...
Take it to your mechanic and get them to plug in the diagnostics computer to trace the fault.

It will pick up all the sensors and give you a reading.

Its just a matter of isolating each point till you narrow it down.

Ive just run plugged in the standard ECU and run a diagnostic system check

ps:diagnostic computer will not communicate with aftermarket ECU

The readout from HICAS was - 25 Engine Rev abnormal signal

Does anyone know what this means?? Would it be to do with reverse (speed sensor) on speedo/gearbox

The error code i chased up on this site for HICAS diagnostic Codes 1993-1999

and came up with: 25 Rear sub sensor input not present

would this be the smaller of the two sensors to the right of the HICAS motor

i guess the sensor or plug could be faulty??

Anyone had the same problem?? or any suggestions on what i need to do??

Thanks for everyones input! :P

oh good question..lol

well as far as i know..R33 have super hicas..which is the same as as 32GTR..

this runs off a electric motor...and i Nissan used KYB motors...

have a look under ur car and see if you can see these motor on the hicas unit behind the diff...

the motor should have a sticker on it..

sounds like u need to run a diagnostics..there is a way to do it..just search...

32gtr is hydraulic.

  • 1 month later...

I'm having the exact same problem with my R33 Gtst S1. It just starting doing it one day and it seems to happen every now and then. It seems to happen on warmer days and doesnt happen at all on cold days which is quite weird. When it does happen the HICAS usnit seems to be quite hot aswell. Has anyone found a fix for this yet? Some more info would be great!

Cheers

Sounds like your HICAS pump is on its way out... The steering gets heavier and the light comes on when the secondary pump isnt working.

Mine had the same problem for a while, just buy and fit a lock out kit and pull out the entire HICAS system (or pay someone who knows how to do it). :happy:

Sounds like your HICAS pump is on its way out... The steering gets heavier and the light comes on when the secondary pump isnt working.

Mine had the same problem for a while, just buy and fit a lock out kit and pull out the entire HICAS system (or pay someone who knows how to do it). :D

It's a 33.. they have an electronic HICAS system.

If you bothered to read the whole thread you would have known this.

But, +1 to removing HICAS, one of the best things I ever did to my car.

  • 2 months later...
  • 7 months later...

Before any more complicated answers, one question..

Have you performed a hicas diagnostic on your car?

A) Yes, and let us know the results..

B) No, go and do one, will find the how to in diy and tute section.

Thank you for your time.

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

    • And finally, the front lower mount. It was doubly weird. Firstly, the lower mount is held in with a bracket that has 3 bolts (it also acts as the steering lock stop), and then a nut on the shock lower mount itself. So, remove the 3x 14mm head bolts , then the 17mm nut that holds the shock in. From there, you can't actually remove the shock from the lower mount bolt (took me a while to work that out....) Sadly I don't have a pic of the other side, but the swaybar mounts to the same bolt that holds the shock in. You need to push that swaybar mount/bolt back so the shock can be pulled out past the lower control arm.  In this pic you can see the bolt partly pushed back, but it had to go further than that to release the shock. Once the shock is out, putting the new one in is "reverse of disassembly". Put the top of the shock through at least one hole and put a nut on loosely to hold it in place. Put the lower end in place and push the swaybar mount / shock bolt back in place, then loosely attach the other 2 top nuts. Bolt the bracket back in place with the 14mm head bolts and finally put the nut onto the lower bolt. Done....you have new suspension on your v37!
    • And now to the front.  No pics of the 3 nuts holding the front struts on, they are easy to spot. Undo 2 and leave the closest one on loosely. Underneath we have to deal with the wiring again, but this time its worse because the plug is behind the guard liner. You'll have to decide how much of the guard liner to remove, I undid the lower liner's top, inside and lower clips, but didn't pull it full off the guard. Same issue undoing the plug as at the rear, you need to firmly push the release clip from below while equally firmly gripping the plug body and pulling it out of  the socket. I used my fancy electrical disconnect pliers to get in there There is also one clip for the wiring, unlike at the rear I could not get behind it so just had to lever it up and out.....not in great condition to re-use in future.
    • Onto the rear lower shock mount. It's worth starting with a decent degrease to remove 10+ years of road grime, and perhaps also spray a penetrating oil on the shock lower nut. Don't forget to include the shock wiring and plug in the clean.... Deal with the wiring first; you need to release 2 clips where the wiring goes into the bracket (use long nose pliers behind the bracket to compress the clip so you can reuse it), and the rubber mount slides out, then release the plug.  I found it very hard to unplug, from underneath you can compress the tab with a screwdriver or similar, and gently but firmly pull the plug out of the socket (regular pliers may help but don't put too much pressure on the plastic. The lower mount is straightforward, 17mm nut and you can pull the shock out. As I wasn't putting a standard shock back in, I gave the car side wiring socket a generous gob of dialectric grease to keep crap out in the future. Putting the new shock in is straightforward, feed it into at least 1 of the bolt holes at the top and reach around to put a nut on it to hold it up. Then put on the other 2 top nuts loosely and put the shock onto the lower mounting bolt (you may need to lift the hub a little if the new shock is shorter). Tighten the lower nut and 3 upper nuts and you are done. In my case the BC Racing shocks came assembled for the fronts, but the rears needed to re-use the factory strut tops. For that you need spring compressors to take the pressure off the top nut (they are compressed enough when the spring can move between the top and bottom spring seats. Then a 17mm ring spanner to undo the nut while using an 8mm open spanner to stop the shaft turning (or, if you are really lucky you might get it off with a rattle gun).
    • You will now be able to lift the parcel shelf trim enough to get to the shock cover bolts; if you need to full remove the parcel shelf trim for some reason you also remove the escutcheons around the rear seat release and you will have to unplug the high stop light wiring from the boot. Next up is removal of the bracket; 6 nuts and a bolt Good news, you've finally got to the strut top! Remove the dust cover and the 3 shock mount nuts (perhaps leave 1 on lightly for now....) Same on the other side, but easier now you've done it all before
    • OK, so a bunch of trim needs to come off to get to the rear shock top mounts. Once the seat is out of the way, the plastic trim needs to come off. Remove 2 clips at the top then slide the trim towards the centre of the car to clear the lower clip Next you need to be able to lift the parcel shelf, which means you need to remove the mid dark trim around the door, and then the upper light trim above the parcel shelf. The mid trim has a clip in the middle to remove first, then lift the lowest trim off the top of the mid trim (unclips). At the top there is a hidden clip on the inner side to release first by pulling inwards, then the main clip releases by pulling the top towards the front of the car. The door seal comes off with the trim, just put them aside. The the lighter upper trim, this is easy to break to top clips so take it carefully. There is a hidden clip towards the bottom and another in the middle to release first by pulling inwards. Once they are out, there are 3 clips along the rear windscreen side of the panel that are hard to get under. This is what the rear of the panel looks like to assist:
×
×
  • Create New...