Need Help EPS Light on. (No Power Stearing)

[AKUDOU]

Need Help EPS Light on. (No Power Steering)

I had my stock wheels and tires put back on the 2000 today and when I left the tire shop the traction control light came on the car quit then came back on quit again then back on. This car just doesn't like the stock tires and wheels. I am beginning to think it has a different rear ratio than stock because with the stock wheels for every mile the odometer registers 1.2 with the 18" SSR GT-1 with 265/35/18 the odometer registered perfect. Anyway back to TCS after the second shutdown everything seemed normal except now the EPS light is on and no power steering.I checked the 50 amp fuse and its ok. Any advice Here? Can't believe it, just sold my 93 never had a problem with it, swapped wheels and now this crap.Seems odd that I never had this problem until the wheel swap... http://www.nsxprime.com/forums/showthread.php?s=&threadid=16484

 

[nsxtasy]

Re: Need Help EPS Light on. (No Power Steering)

I am beginning to think it has a different rear ratio than stock because with the stock wheels for every mile the Speedo registers 1.2 with the 18" SSR GT-1 with 265/35/18 the Speedo registered perfect.

Changes in gearing don't have any effect on the speedometer or odometer. However, changes in tire size do.

The 265/35-18 tires are 2.4 percent larger than the stock 245/40-17 tires on your 2000. Thus you would expect the smaller stock tires to register 2.4 percent more miles than the 18" tires. But not 20 percent as you are claiming. There are other sources of speedometer variation, including tire wear (which can account for a difference of up to 2 percent) and actual speedometer miscalibration.

now the EPS light is on and no power steering.

I thought every 2000 NSX has power steering.

Any advice Here?

Did you look in the owner's manual and in the service manual?

 

[nsx13]

There was a recall on mine a few years back - I accidentally disabled the EPS (forgot how I did it), then found out that the units needed to be replaced. Mine is a '97, but anyway I recommend you call the dealer and set up an appointment (chances are the new EPS unit needs to be ordered).

Good luck!

 

[AKUDOU]

Re: Re: Need Help EPS Light on. (No Power Steering)

Changes in gearing don't have any effect on the speedometer or odometer. However, changes in tire size do.

The 265/35-18 tires are 2.4 percent larger than the stock 245/40-17 tires on your 2000. Thus you would expect the smaller stock tires to register 2.4 percent more miles than the 18" tires. But not 20 percent as you are claiming. There are other sources of speedometer variation, including tire wear (which can account for a difference of up to 2 percent) and actual speedometer miscalibration.



I thought every 2000 NSX has power steering. It did have power steering until the TCS and EPS light came on.TCS light is out but not until the motor quit running 3 times the first 1/4 mile. I coasted into a parking lot, restarted the motor the TCS light never came back on. The EPS light stayed on and the power steering doesn't work,actually I like it better, feels like my 93 did.



Did you look in the owner's manual and in the service manual?

 

[AKUDOU]

There was a recall on mine a few years back - I accidentally disabled the EPS (forgot how I did it), then found out that the units needed to be replaced. Mine is a '97, but anyway I recommend you call the dealer and set up an appointment (chances are the new EPS unit needs to be ordered).

Good luck!

Thanks for the reply.Car only has 5,700 mi on it, just seams odd that all this happened after the stock wheels were put on. To the dealer it is.

 

[AKUDOU]

Re: Re: Re: Need Help EPS Light on. (No Power Steering)

Changes in gearing don't have any effect on the speedometer or odometer. However, changes in tire size do.

The 265/35-18 tires are 2.4 percent larger than the stock 245/40-17 tires on your 2000. Thus you would expect the smaller stock tires to register 2.4 percent more miles than the 18" tires. But not 20 percent as you are claiming. There are other sources of speedometer variation, including tire wear (which can account for a difference of up to 2 percent) and actual speedometer miscalibration.



I thought every 2000 NSX has power steering. Nsxtacy:It did have power steering until the TCS and EPS light came on.TCS light is out but not until the motor quit running 3 times the first 1/4 mile. I coasted into a parking lot, restarted the motor the TCS light never came back on. The EPS light stayed on and the power steering doesn't work,actually I like it better, feels like my 93 did.



Did you look in the owner's manual and in the service manual?

Nsxtacy: On the way back from NSXPO (bought car the day before) I noticed by checking the mile posts that I was racking up 1.2 miles on the odometer for every actual mile driven.When I arrived home I checked the mileage and I was 200 miles over and the trip was real close to 1000 miles. The car only had 3,400 miles when I picked it up in Houston. Parked the car in November didn't drive it till March,but while I had it in the garage at home I switched the stock wheels and put them on my 93. I put the SSR on the 2000 to check out the look because I have GT-3 on order. While I was driving the 2000 I noticed that the shifts felt better not like with the stock wheels because every gear change through third I had to apply a little rpm to keep from jerking me forward. This was not the case with the 265/25/18 every shift was precise and smooth. Ok I check out the odometer now with the SSRs at the interstate mile posts and its perfect. The SSR were ok on the 93 with a factory (24.9)vs(25.4). The 2000 stock is a (24.6) but the odometer is perfect with the (25.4). What do you think?

 

[Lud]

There should be trouble codes in the computer related to these problems. Try pulling the codes and see if that gives you any idea where the problem might be. Here is info on how to retrieve the codes and a list of what they mean (requires Acrobat Reader 5.x): http://www.nsxprime.com/FAQ/DIY/codes.pdf

I'm not sure how TCS and EPS errors would be related offhand, but I've never had an EPS issue so I'm not sure what all the potential causes are.

 

[nsxtasy]

Re: Re: Re: Re: Need Help EPS Light on. (No Power Steering)

What do you think?

I think it's possible that the equipment used to measure the placement of the mile markers could have been faulty. That would be my guess as to the most likely explanation for what you experienced. The tire diameter/circumference can't have been off by a factor of 20 percent.

I also think that any jerkiness in shifting would not be due to the size or type of tires. Different tires can have different grip characteristics, and this can cause one tire to grip more than another - so if your shifts are jerky, it can have more effect on how much the car itself jerks. But if your shifts are smooth, they will be smooth regardless of what tires you are using. And differences in grip are usually due much more to the type (model) of tire used, much more so than the size.

 

[AKUDOU]

There should be trouble codes in the computer related to these problems. Try pulling the codes and see if that gives you any idea where the problem might be. Here is info on how to retrieve the codes and a list of what they mean (requires Acrobat Reader 5.x): http://www.nsxprime.com/FAQ/DIY/codes.pdf

I'm not sure how TCS and EPS errors would be related offhand, but I've never had an EPS issue so I'm not sure what all the potential causes are.

Thanks Lud Car goes to Acura in the morning. I will report the fix when i get it back.

 

[AKUDOU]

Re: Re: Re: Re: Re: Need Help EPS Light on. (No Power Steering)

I think it's possible that the equipment used to measure the placement of the mile markers could have been faulty. That would be my guess as to the most likely explanation for what you experienced. The tire diameter/circumference can't have been off by a factor of 20 percent.

I also think that any jerkiness in shifting would not be due to the size or type of tires. Different tires can have different grip characteristics, and this can cause one tire to grip more than another - so if your shifts are jerky, it can have more effect on how much the car itself jerks. But if your shifts are smooth, they will be smooth regardless of what tires you are using. And differences in grip are usually due much more to the type (model) of tire used, much more so than the size.

nsxtasy If the mile post are off then they are bad in Texas, Arkansas,Tenn,and Kentucky.I had the same thought and checked going through each state on my return trip from Ft. Worth.The tires are OEM Bridgstones. Car has 8am appointment at Acura tomorrow. I will report the fix when I get it back. Thanks

 

[nsxtasy]

Re: Re: Re: Re: Re: Re: Need Help EPS Light on. (No Power Steering)

nsxtasy If the mile post are off then they are bad in Texas, Arkansas,Tenn,and Kentucky.I had the same thought and checked going through each state on my return trip from Ft. Worth.

Then you're right, that's virtually impossible.

I have no answer then. All I can say is that the difference between two sizes of properly-inflated tires with a nominal difference of 2.4 percent is not likely to vary by 20 percent.

 

[Larry Bastanza]

I have heard about more then a few NSX's with speedo/odometer error. Do a search on Speedo .

I cannot recall off hand, but I will check in my archives tonight, I really think there is a way to calibrate the speedo/odometer.

LarryB

 

[V12NSX]

My 2000 had an intermittent EPS problem like yours shortly after I bought it. Acura put in a new unit for free. I have no idea why your speedo would be off unless it was recalibrated.

S.L.

 

[nsxtasy]

I have heard about more then a few NSX's with speedo/odometer error. Do a search on Speedo .

I cannot recall off hand, but I will check in my archives tonight, I really think there is a way to calibrate the speedo/odometer.

Yes, but if it were a simple miscalibration of the speedo/odo, why would it suddenly go away when changing wheels/tires that are allegedly the same size?

 

[AKUDOU]

Yes, but if it were a simple miscalibration of the speedo/odo, why would it suddenly go away when changing wheels/tires that are allegedly the same size?

Ken I just measured the OD of the rear 18" SSR and the rear stock wheels with a T-square and level. The difference was the 265/35/18 are 1-3/8'' taller, that's a big difference. Taking car to Acura in the morning then boarding plane to Aslamorada Fla for a little fishing and R&R.

 

[nsxtasy]

I just measured the OD of the rear 18" SSR and the rear stock wheels with a T-square and level. The difference was the 265/35/18 are 1-3/8'' taller, that's a big difference.

Yes and no.

Yes, that's bigger than the difference you would expect from the nominal sizes. When you do the math, you find that the expected outer diameter for a stock 245/40-17 tire is 24.7 inches, and for the 265/35-18 is 25.3 inches. So you expect the difference to be 0.6 inches, and instead it's 1.375 inches. So the difference is bigger than expected.

But no, that cannot, all by itself, account for a difference of 20 percent in your odometer readings. A difference of 1 3/8 inches means that the 265/35-18 tires have an outer diameter that is 5.6 percent larger than the stock tires. This would account for a difference in speedometer readings of 5.6 percent, but not 20 percent.

The mystery deepens.

Taking car to Acura in the morning then boarding plane to Aslamorada Fla for a little fishing and R&R.

Have a great time!

 

[DocL]

... boarding plane to Aslamorada Fla for a little fishing and R&R.

The best trolling is at the Tikki Bar. I've also found that Rum Runners are great bait.

Lets us know when you down here, maybe a few of us can meet up for a few hours. Islamorada is only a 1.5 hour drive for most of us.

 

[Larry Bastanza]

Ken,

I could not find it in my archives last evening, I will keep looking.

LarryB

 

[AKUDOU]

The best trolling is at the Tikki Bar. I've also found that Rum Runners are great bait.

Lets us know when you down here, maybe a few of us can meet up for a few hours. Islamorada is only a 1.5 hour drive for most of us.

Dr.Lane, Damn! Didn't get your post till today just got back. You are right on about the Tikki Bar. Stayed at the Cheeca Lodge,Shell invites a group of us down every year for some camaraderie, they always say its the last year but never is. The bar tender at the Islamorada Fish Co told me that the previous week was the bar tenders bash held at Holiday Ilse and was better than Girls Gone Wild.I am trying to get Shell to schedule the trip around that next year. Ok here's what Acura did to remedy my problem. (1)The steering pulse unit was shorted out,replaced with 39985-SLO-951 pulsar unit N/C.(2)The Speed Sensor was shorted out replaced with 79420-SLO-000 Sensor AssyN/C. Now the odometer check between MM post is off just slightly probably because tire tread is half gone. Thanks to everyone for the replies to these problems. Ken maybe this fix should go in FAQ.Dock my wife and I are planning a road trip down to Islamorada late September hope you can join us.