Very strange things going on with my car???

[S2KPUDDYDAD]

Sorry for the long post but, to give all info on the issue it was necessary, please read:think:

I can usually figure out things pretty much on my own but, I have one that is got me a bit perplexed.

It started a few weeks ago when I was driving on the highway going around 60 MPH with my A/C on. The cockpit started feeling a bit warm so I cranked up the A/C some more…..did not help, the A/C was blowing warm air. Then I look down at my dash and my EPS is lit up…..then no more Speedo “0” and then a Engine light.
I pulled over, and the car was running a bit rough, so I shut it down. I waited for a few minutes and
restarted the car, car ran ok but, the EPS and CEL are still lit but, the speedo is working again. I shut it down again and this time I pull the ECU fuse and reset the ECU. I start the car again and the CEL is gone, the EPS light goes out, speedo is working, all is good but, I have no A/C, it is blowing warm air.

I drove the car home with no A/C on. I did put it on briefly a few times and it would blow cold air for a little bit of time then blow warm. I shut it off for the rest of the drive and everything was fine. I hooked up a code scanner and no code to be found. I check the A/C and it is working again???? Then not working.

I have driven the car many time since this happened but, never used the A/C. The car has ran flawlessly but, today I drove the car and ran the A/C to see what would happen….The A/C was working fine and I drove the car a few miles then….. The BS starts…..No A/C warm air, then the speedo goes to 0, then the EPS lights up, then a CEL

I drive the car to my friends (a mechanic) put the car on a scanner and only one code comes up for a Speed sensor.

I have a Modify speed device in the car for my diff gears, checked it and everything looked to be fine. The unit has been in the car going on two years and has worked fine.
I have a VAFCII in the car for about 3 plus years and has never been an issue.

My guess is it is A/C related because, I have no issue with the car when not running the A/C. When I put the A/C on is when there is a problem.

I am going to look the repair manual over tomorrow:freak2:

[speedracer]

I had an AC problem, the air blew warm sometimes then. Bam, AC compressor goes south, and contaminates the whole system. Had to replace everything, In my case it was under warrenty. Check the compressor!

[S2KPUDDYDAD]

I had an AC problem, the air blew warm sometimes then. Bam, AC compressor goes south, and contaminates the whole system. Had to replace everything, In my case it was under warrenty. Check the compressor!

I am going to be doing that for sure:thumbup:

[repiv]

I'm having a hard time believing that the A/C situation is related to the rest. This may be a coincidence. However, confirm that nothing to do with the A/C is intersecting the power or ground circuit of the YJ or speed sensor circuit. Check the charge in your A/C system. It may or may not be the compressor. It could also possibly be the compressor pulley. It is clutched. Check the wiring harness going to the compressor. How's your belt tension?
The speed sensor signal not getting to the ECU can cause the kinds of things you have witnessed (aside from the A/C thing). Last year, I had a similar thing happen with my car. My Yellow Box started to act up and I got one of Modifry's YJs. Same problems continued. No stable speedo, no stable cruise control, CEL. I pulled my hair out trying to figure out what the heck was going on. Finally, I decided to run the YJ ground wire from the cockpit to the engine bay, where I found a solid ground bolt on the engine. Things have been working perfectly since. It turns out that the ground I was using for both the YB and the YJ had degraded over the years and the device was no longer grounded well. Thus, the ECU was not getting a proper signal. The signal ranged from sporadic to non-existent. I concluded that these speed compensators are very dependent upon a really good ground.
Oddly, during the same season, "Gomarlins3" was also having weird problems with his YJ. I'm not sure what he did to resolve his situation but Modifry kept track of our PMs. Oh, there was yet another YJ user on the east side of the States having problems. He too, was in contact with Modifry and myself about it. I have not heard from him for over a year, so can't tell you if that was resolved.

[S2KPUDDYDAD]

Thank you sooooo much, you are the man I was hoping you had been through this in a none morbid way:laugh:
I will reground the YJ right away. I was thinking too, that the speed sensor and EPS were a hand in hand issue. The A/C issue makes more sense to be it’s own problem. We (my friend “Dave the mechanic“) first thought the clutch on the A/C was the bad guy in my having no A/C because, it was not engaging when signaled. The A/C fan would kick in but, the clutch would not. We checked the relay and it is in good working order and power is going to the relay. I will put a set of gauges on the A/C and I will look at the belt and pulley too.


Again thank you for the FYI on the Modify YJ Electrical issues drive me crazy.

I will keep you guys informed on what I find to maybe help someone else in the future. I probably wont get a chance to mess with the car till the weekend, Stand by:)

[My_yella_s2k]

also, on other models, if the A/C is low on freon, the pressure switch will cancel out the motion to start the clutch..
like Dave said, and your doing this coming weekend, the A/C maybe a slight bit to low...
:shrug:

[S2KPUDDYDAD]

also, on other models, if the A/C is low on freon, the pressure switch will cancel out the motion to start the clutch..
like Dave said, and your doing this coming weekend, the A/C maybe a slight bit to low...
:shrug:

I am going to go through the entire A/C and cooling systems:thumbup:

Thank you:)

[repiv]

Yes, the EPS is somewhat governed by road speed. In fact, the manual indicates that if you have 3000 rpm or more or more than 3 minutes, with no road speed (ie, "0" on the speedo), the EPS light will come on.
Good luck.

[S2KPUDDYDAD]

Yes, the EPS is somewhat governed by road speed. In fact, the manual indicates that if you have 3000 rpm or more or more than 3 minutes, with no road speed (ie, "0" on the speedo), the EPS light will come on.
Good luck.

Ya, and the steering gets heavy too;) .............:laugh:

[Stratocaster]

It could be related. the speed sensor is very low voltage, so it the compressor was heading south, and drawing a bit more voltage, that could cause a small drop in the system. That drop may be enough to stop the yellow jacket from getting what it needed, or lower the voltage to the speed sensor. When you add in the resistance of the connection for the yellow jacket between the ECU and sensor, that may be just enough to cause the ECU not to see the speed sensor wave form. That inturn would cause the EPS light and Speedo to 0.

[S2KPUDDYDAD]

It could be related. the speed sensor is very low voltage, so it the compressor was heading south, and drawing a bit more voltage, that could cause a small drop in the system. That drop may be enough to stop the yellow jacket from getting what it needed, or lower the voltage to the speed sensor. When you add in the resistance of the connection for the yellow jacket between the ECU and sensor, that may be just enough to cause the ECU not to see the speed sensor wave form. That inturn would cause the EPS light and Speedo to 0.

Thank you for your input on this as well:thumbup: I am going to reground the YJ like Dave said.
I have another compressor on stand by if it is poo:)

[Yellows2k]

I just found this thread by searching on google Im having the same exact problem you are iit was working fine for 2 years and it started doing weird stuff this year. I kinda just let it go. It is annoying when you are on the freeway and all of a sudden your ps goes to full power because it reads a 0. I also got the speed sensor error from the computer too when i went to autozone. I will check the ground on my YJ today from these other post . Today something weird happend on the freeway too its like the gas pedal wasnt responding even in neuteral i wonder if this has anything to do with the YJ problem.

[repiv]

It is annoying when you are on the freeway and all of a sudden your ps goes to full power because it reads a 0.

Today something weird happend on the freeway too its like the gas pedal wasnt responding even in neuteral i wonder if this has anything to do with the YJ problem.

What is "ps"?

Can you elaborate on what exactly happens when your gas pedal doesn't "respond"?

[yinlun]

Assuming power steering. It goes from a tightened setting while freeway driving to a parking lot setting when it reads your speed is 0.

[repiv]

Assuming power steering. It goes from a tightened setting while freeway driving to a parking lot setting when it reads your speed is 0.
But how would he know he's getting full boost? At highway speeds, you are not moving the steering wheel much, so the difference between zero boost and full boost would be quite difficult to tell. Because of the limited movement of the steering wheel at highway speeds, I'm curious what exactly it is that is annoying. While moving, even in a sweeping curve, unless you slow down considerably, moving the steering wheel even with zero boost is extremely easy.
One sure way to test this would be to see what the cruise control does as it's linked to the speed sensor. Furthermore, at highspeeds sustained for more than 3 minutes without a speed signal, the EPS goes to zero boost anyway and the EPS light would come on, thereby making it impossible to tell from a tactile point of view.

[yinlun]

But if you're on a freeway and you go from 0 boost at 70mph to full boost at 70mph, the steering wheel would be much easier to turn, maybe to the point where he's entering too much input and probably feeling extremely artificial.

I think you're thinking about getting no boost on the freeway, instead his EPS is reading zero and is giving it full boost to the PS.

I know it's possible to tell, cause I've driven a car where the power steering was going. The difference between the unit operating and not operating while on turns was quite noticable.

I'm not sure on the EPS though...or. I might simply have interpretted the "PS" for power steering.

[JustinC]

Yes, he is talking about power steering. I am not 100% about the S2000 but I know on the old preludes that had electric power steering, they would shut the power steering assist off at 20mph. I am assuming if you had power steering enabled at highway speeds the same amount of force to turn the wheel would cause you to move the wheel more than you anticipated.

[JustinC]

Another thing everyone may check is that the wire supplying voltage to the modifry unit is not intermittent. You can do so by turning the key on and then tapping the connection point to see if vibrations are causing the connection to fail momentarily.

[mrscbw]

IM also having this problem gas pedals cuts out..then i have to goto neutral and rev then go back to gear and its back to normal...Vtec doesnt work..Odometor doesnt clock and speedo is at 0..My yellowbox is not powered fuse is blown..I think its a short..I did a eps test adn the eps wire has an open circuit there has got to be a shor tsomewhere..As soon as i fugre the short ill replace the fuse and hopefully everything would be fixed..

[mrscbw]

I just found this thread by searching on google Im having the same exact problem you are iit was working fine for 2 years and it started doing weird stuff this year. I kinda just let it go. It is annoying when you are on the freeway and all of a sudden your ps goes to full power because it reads a 0. I also got the speed sensor error from the computer too when i went to autozone. I will check the ground on my YJ today from these other post . Today something weird happend on the freeway too its like the gas pedal wasnt responding even in neuteral i wonder if this has anything to do with the YJ problem.

Does your stereo work? Is your yellowbox powered?

[zk1]

Total newbie, pardon my ignorance, but what does CEL refer to in this thread? :nervous:

[Justin6264]

Check Engine Light

[Sz28r]

any updates on the cause?? thanks

[zk1]

OK, thanks.:duh:

[repiv]

Also Known As (aka) .............. MIL (malfunction Indicator Light).

[C G]

Unrelated but interesting to me. My sister has repeatedly had her AC stop working along with all guages in her bone stock Subbie Outback. In her case at least it's related to a module in the radio. Sounds nuts to me but they have replaced it twice to correct the problem.

In this case I would bet on the grounding problem Dave mentioned.

[mrscbw]

Reviving a thread because i finally solved the problem. What was happening was I had a phone charger plugged into my car. And I have no idea but the connection tip was broken and was loose inside the power socket. When it would vibrate and touch both the + and the - it would cause a short to my ACC fuse, which led to all the other problems. Removed parts inside the socket never had a problem since.

Weird incident but maybe somebody just might run into the same. (Don't buy cheap chargers) j/k

[bimdub]

Unrelated but interesting to me. My sister has repeatedly had her AC stop working along with all guages in her bone stock Subbie Outback. In her case at least it's related to a module in the radio. Sounds nuts to me but they have replaced it twice to correct the problem.

In this case I would bet on the grounding problem Dave mentioned.


yeah the Clock circuit in our Impreza caused the Airbags to have intermittent problems.....talk about integrated electronics

[tmrracer209]

i just got my s2k about a month ago and while i run my defroster the a/c turns on and i cant turn it off is this normal? also i didnt get an owners manual and was wondering how to set the cruise control?

[repiv]

i just got my s2k about a month ago and while i run my defroster the a/c turns on and i cant turn it off is this normal? also i didnt get an owners manual and was wondering how to set the cruise control?

Yes, this is normal. To defrost the windshield, you also at times, need to de-humidify and that's one of the functions of the A/C. There is a way to defeat this on some or all years of S2000s. I can't remember how but it's a series of button pushes.

Here's the owner's manual: http://bugguide.net/images/cache/TZKR3ZSR0H3LOLQZAL3LNLZZ9LZZULSRULQRUL7ZKHGRBLFL2L JL1LIZAL5ROLIZDLERKHKZPLHZPLZZDZ4RDLGR.jpg

Happy reading.