Power steering Control unit

Post by **silver2k2** » Sun Jun 03, 2007 10:24 am

I am trying to fix my power steering. It is really heavy. The fluid is brand new, the pump is new as well. I flushed the system when I did the pump.

I have ran through the diagnostic procedure in the FSM and it looks like I need to replace my Power Steering control unit. Mike (Goody94q45) has been nice enough to give me the part, however we dont know what it looks like

Is this the correct part below?

Post by **ScottJackson** » Sun Jun 03, 2007 12:51 pm

I do believe so. It was a while ago that I was in there, but that looks VERY familiar. So, I'm 95% sure that's it... behind the radio and to the left (driver side).

Post by **goody90q45** » Sun Jun 03, 2007 2:25 pm

Jared- I've parted out 2 Q's- a 91 base and a 94t, so I should have two of them in my collection and I've got none. Could this be something that's only on the active models?

Scott- Was the one you recall seeing on your active Q?

Post by **silver2k2** » Sun Jun 03, 2007 2:30 pm

Yes it to the left about even with the stereo.

I dont think its only on the active, thats wierd you should have two if thats the right part. Maybe somone else will know

Post by **elwesso** » Sun Jun 03, 2007 2:42 pm

I have never heard of one of those things going out, honestly I think when you put the new one in, you are going to be in the same place you are now. I think theres maybe a 10% chance that this will work. I could be wrong, but I bet its something else. Theres a pressure switch on the pump that may not be functioning properly

What diagnostic procedures did you do to come to this conclusion?

Post by **silver2k2** » Sun Jun 03, 2007 4:34 pm

I dont have a tailout out.I checked the pressure solenoid on the rack and jumped it it clickedq45tech said this is something that they commonly pull out of Junk Qs to replace.

I am not sure what else it could be symptoms are"

Heavy power steering, it is working but boost is lowit just stopped working one day in a parking lot, it doesnt come and go or change with temperature it just stopped and never came back.

Not sure what else it could be

Post by **elwesso** » Sun Jun 03, 2007 4:50 pm

no theres actually a pressure SWITCH on the pump or osmething, not the solenoid....

are you just speculating that your control unit is bad, or do you have any supporting evidence?

IM not trying ot nit-pick because you will eventually fix the problem by throwing parts at it however it proves to not be the most efficient way.

Post by **silver2k2** » Sun Jun 03, 2007 4:59 pm

I just swapped out my active pump for std pump so I know its not that

The solenoid on the rack clicks like the FSM says so that should rule that out

Post by **elwesso** » Sun Jun 03, 2007 5:22 pm

Basically all the controller does is act as a variable resistor basically like the fuel pump controller...

It is common for members/owners to give up and start buying parts and hoping the problem goes away. That doesnt work with me, so im gonna try and figure out what the problem is before I start trying to fix it.

Moving along, you can use DIAGNOSTIC PROCEDURE 1 in the ST section in the FSM as a starting point.

For your convenience, when they refer to "diagnostic connector" theyre talking about the gray consult connector. most of this stuff can be tested pretty easy with a VOM.

If you can do the first test in diagnostic procedure and prove to me that its in fail safe, then I'll believe the connector is bad...

In case you dont want to look at the FSM, let me outline the first test.

Get out your VOM (you have one, right? If not, drive to walmart and pick up one), and probe on the consult connector PIN 7 and body ground... Pin 7 is the 4th one from the left on the top row, Red/Yellow wire... While your testing press the brake pedal. For starters just check at 0MPH, and that will determine if its working right or in fail-safe right off the bat...

More voltage=more assist.

At 0MPH you should have 4.4-6.6 voltsAt 62MPH you should have 1.8-2.8 volts

Next youd want to check the voltage at the solenoid.... it should be the same.

Do that and report back.

Post by **elwesso** » Sun Jun 03, 2007 5:23 pm

BTW if youve already done this please excuse me, i am trying to get your car fixed and not insult your intelligence.

Post by **silver2k2** » Sun Jun 03, 2007 5:38 pm

Thanks Wes I will try that and report back. I had the dash all torn apart so I was just going to try replacing it. Now that I have back together my next step was to do just as you describe. Thanks again for the assistance

Post by **ScottJackson** » Sun Jun 03, 2007 8:23 pm

Yes, when I was digging into mine, it was the active Q.

Post by **silver2k2** » Mon Jun 04, 2007 3:37 pm

I tested it and got 0 Volts with the brake depressed (Test C) and 0 volts with the parking brake depressed (Test A). Both lead to a faulter power steering control unit.

Now the question is am I looking at the right box if so is in different on the active because mike has parted out two Qs and doesnt have one

Post by **elwesso** » Mon Jun 04, 2007 3:51 pm

ok good... Thanks for testing that.

Click to enlarge. It shoudl be pretty easy to identify because its right next to the AC amplifier which is a long black box with 2 connectors on it. Its basiclaly right between the cruise control box which is a small silver box with a relay lookin thing on the top and the AC amp.

Post by **silver2k2** » Mon Jun 04, 2007 4:11 pm

Its to the left (if sitting in the car) of the AC amp bolted on with a 45* bracket to the ACSD as I believe my picture shows. I just want to confirm with somone who has replaced one

Post by **goody90q45** » Mon Jun 04, 2007 4:31 pm

silver2k2 wrote:Its to the left (if sitting in the car) of the AC amp bolted on with a 45* bracket to the ACSD as I believe my picture shows.

Were you able to look at the face of the unit (or pull it) and does it say PS control?

Post by **silver2k2** » Mon Jun 04, 2007 5:12 pm

No I didnt I tried to look at the back and there was nothing there, I didnt pull it the other bold looked like a real bear to get to.

Post by **goody90q45** » Mon Jun 04, 2007 6:03 pm

silver2k2 wrote:No I didnt I tried to look at the back and there was nothing there, I didnt pull it the other bolt looked like a real bear to get to.

Working under the dash is full of perils. Many, many sharp edges and amps/sensors/relays hidden in the dark depths. I took a beating on this part out and have the scars to prove it. Most of the carnage came from under the dash. (Finished the part out today. To the Infiniti salvage yard on Friday.)

Post by **silver2k2** » Tue Jun 05, 2007 7:53 am

Yeah its sharp under there, to tell the truth I really wish the diagnostic pointed to something else. No I just need to make sure I am replacing the right part. Q45tech should know I havent seen him around lately, he was the one that said they commonly pull this off of junked Qs before they go to be made into new korean cars

Post by **Q45tech** » Tue Jun 05, 2007 8:43 am

We always buy prejunker Q the electronic modules alone add up to the purchase price..............even if engine, tranny, driveshaft, diff, rack, and interiors are worthless.

The springs for active conversions, ABS, compressors, alternators, PS pump for conversions, big fuses, relays, MAF, IAC, are icy on the cake.

If you purchased all the new parts to build a Q it would cost way over $80,000 now................even used $10,000 at a junkyard one piece at a time.

Sometimes it takes 4 -$500 Q plus a load of new parts to make a good one.

Post by **silver2k2** » Tue Jun 05, 2007 8:48 am

It sounds like you have see the power steering control unit many times. Is the part in the picture the power steering contriol unit?

Post by **elwesso** » Tue Jun 05, 2007 2:48 pm

Goody if thats the worst the Q has torn you up you havent worked on the Q yet...

Post by **Q45tech** » Tue Jun 05, 2007 3:58 pm

I could create a table with the number of surgical stitches required for each under dash module.

You can always tell a Q tech by his hands and arms. No PopEyes need apply.

Post by **DrewQ45** » Wed Jun 06, 2007 12:34 am

goody94q45 wrote:
Working under the dash is full of perils. Many, many sharp edges and amps/sensors/relays hidden in the dark depths. I took a beating on this part out and have the scars to prove it. Most of the carnage came from under the dash. (Finished the part out today. To the Infiniti salvage yard on Friday.)

Damn Goody! Looks like you had an encounter with a pissed-off feline.

Post by **silver2k2** » Sat Jun 09, 2007 6:09 pm

Update:

The control unit pictured is the power steering control unit, I swapped mine out today and now it works

Post by **3Q Jay** » Sat Jun 09, 2007 6:13 pm

good deal.

Post by **goody90q45** » Sat Jun 09, 2007 6:35 pm

Was the control unit only on the active?

Post by **silver2k2** » Sat Jun 09, 2007 6:40 pm

They said it was off of base, I didnt see them pull it but I know they dont have any actives

Post by **woodcoach** » Wed Jul 02, 2008 4:10 am

Hello,I'm having trouble finding a PSCU for my 96 Q45 anywhere near me here in MPLS.Can you guys help?I'll gladly pay to keep the old beast running for my daughter, just need the dang part.I was told by a Q45 Tech that was the part I needed, but letting a dealer sell you the part and install it is why they're sometimes called "stealership".

Please help me out.Thanks,JW (woodcoach)

Post by **maxnix** » Wed Jul 02, 2008 4:52 am

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Power steering Control unit

Power steering Control unit

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