Speedometer drops to zero, Check Engine, and TCS lights come on.

[SennaPerfected]

Hello...

Soon after I started driving, the car began to bog as if it had water in the tank. I have never used any gas other than super, and 99.9% of the time it's Sunoco Ultra 93. Even after the car had warmed up, in addition to the bogging, the following events took place:

• Speedometer needle began to bounce between the actual speed down to zero (65 to zero), then bounced in-between my actual speed (jumped from zero up to 40 and back to zero, even though I was still going 65), and finally stopped jumping and sat at zero. The RPM needle was not affected.

• Check Engine Light came on

• TCS light came on

If I'm correct, the NSX speedometer is not cable-driven, but rather electronic, correct? I can see perhaps a bad batch of gas contributing to the bogging, but what could have caused the speedometer needle, check engine, and TCS lights to come on? Your assistance is greatly appreciated. Ciao... Miléd

 

[Ojas]

My guess would be the speed sensor. Perhaps the "bogging" was not due to gas, but was the result of the TCS kicking in due to incorrect reading from the speed sensor.

http://www.nsxprime.com/forums/showthread.php?t=19596
http://www.nsxprime.com/forums/showthread.php?t=35615
http://www.nsxprime.com/forums/showthread.php?t=35370

Hope this helps!

 

[hlweyl]

I'd agree with Ojas, probably nothing to do with gas or any major engine malfunction. Just a speed sensor.

 

[SennaPerfected]

My guess would be the speed sensor. Perhaps the "bogging" was not due to gas, but was the result of the TCS kicking in due to incorrect reading from the speed sensor.

http://www.nsxprime.com/forums/showthread.php?t=19596
http://www.nsxprime.com/forums/showthread.php?t=35615
http://www.nsxprime.com/forums/showthread.php?t=35370

Hope this helps!

Hello Ojas, hlweyl... Thanks so much for the prompt responses and for linking me to where others have already and previously reported the same exact symptoms. I am relieved to know it is nothing major, and should this happen again (probably will), I will have the speed sensor replaced. I'm very grateful to you fellas and NSX Prime! Ciao... Miléd

 

[gheba_nsx]

Ciao Miled!

I solved my problem cleaning the sensor... thanks Matteni for the help!

Try it, it is the first time that cleaning (I used contact cleaner) really worked to fix something: I expected the need to buy the sensor but gladly I tried this first!

 

[SennaPerfected]

Ciao Miled!

I solved my problem cleaning the sensor... thanks Matteni for the help!

Try it, it is the first time that cleaning (I used contact cleaner) really worked to fix something: I expected the need to buy the sensor but gladly I tried this first!

Ciao Giuseppe! Come siete?

I always get great help here and glad to hear the symptoms were a result of the speed sensor. I will take your advice and spray some cleaner but, where exactly is the speed sensor located? Does anyone have a picture of it? Grazie mio amico!

 

[gheba_nsx]

It is located quite low in the right part of the engine bay (when looking at it from the driver side of teh car), on top of teh transmission case.

Check on the Service Manual (online somewhere here on prime) for more details, unfortunately I have no pictures...


Good luck!


PS: sto bene, grazie. E tu?

 

[Zishan]

I had the EXACT same problem, but it was my Main Relay part EZ 1010. Do a search, my engine would bog/drop to zero for a split second and my TCS light and sometimes check engine light would show....

Regards,
- Z

ps - I picked up the part from Dave Day at www.asian-auto-parts.com for about $50 bucks!

EDIT: Actually, I maybe wrong. It might be the RPM's there were dropping. So in this case, it might not be the Main Relay. Sorry, this old age is getting to me!

 

[gheba_nsx]

On my old silver I had the main relay problem but in my case no tacho needle jumps happened...

I had the issues you described too with a bad main relay:

"engine would bog/drop to zero for a split second and my TCS light and sometimes check engine light would show"

but no tacho issues. On the current black NSX I had the tacho issue and it was the sensor.

 

[BlKeViL]

Ciao Miled!

I solved my problem cleaning the sensor... thanks Matteni for the help!

Try it, it is the first time that cleaning (I used contact cleaner) really worked to fix something: I expected the need to buy the sensor but gladly I tried this first!

Gheba_nsx,
Where is the sensor located ? and what main relay are you talking about and location ?

 

[SennaPerfected]

It is located quite low in the right part of the engine bay (when looking at it from the driver side of teh car), on top of teh transmission case.

Check on the Service Manual (online somewhere here on prime) for more details, unfortunately I have no pictures...


Good luck!


PS: sto bene, grazie. E tu?

Ciao Giuseppe! Thanks for explaining where the location is. I will check it out. Sto molto bene, grazie!!!