Supra Code 51.... Help!!!!

[supra_89_vang]

Hi guys,

89 supra turbo

I did a code test and i got the code 51. I said to check my wires and throtle sensor and so on.... I replace the throtle sensor with a non turbo throtle sensor but not thing changed. I am not sure if it matter is a non turbo sensor. i also replace the sensor right next to the throtle sensor with a non turbo sensor too but still nothing change. Does any one know what might be wrong with my car.

also do any one know how to check is the sensor is still good? thanks

Joe

 

[johnathan1]

From what I understand, the non-turbo TPS (Throttle-Position Sensor) will not work on the Turbo, they are mounted facing the opposite direction...

What other sensor are you talking about?

Here is a link to the TSRM (Toyota Service-Repair Manual)...This will help you out a LOT!
http://www.cygnusx1.net/supra/library/TSRM/index.html

And here is how to check if the TPS is good:
http://www.cygnusx1.net/supra/library/TSRM/fi/FI_101.html

 

[jetjock]

It boggles the mind.....

 

[Joel W.]

The TPS should fit Johnathan, It just needs to be turned 180 degrees out.

Use the second link Johnathan posted to adjust your TPS as the code 51 side of the TPS rarely fails.

Run a search.
http://www.supramania.com/forums/showthread.php?t=19482&highlight=code+51

http://www.supramania.com/forums/showthread.php?t=16716&highlight=code+51

It never gets old JJ

 

[johnathan1]

Really? Hmmm, I didn't realize the NA one would fit. Cool!

 

[Joel W.]

I have read that Toyota used the same TPS in the Camery, Supra, Mr2, Cressida and the trucks so I would be very suprised if it did not fit the N/A Supra. I could be wrong, so if I am, please correct me...

 

[supra_driven]

I had this code for a few days now too. So today i went ahead and check resistance according to the factory manual and found out it was misadjusted. So i messed around with until i hit the right spot and all the specs where back to where they're supposed to be. I reset the computer and ran diag one more time. This time there were no codes. Before, code 51 would come up before i even turned the engine on.

Cliff notes: adjust the TPS according to the TSRM.

 

[Joel W.]

Code 51 is not stored in memory. There is no need to reset the ECU... Just so you know..

 

[supra_driven]

So once it's fixed, the code will no longer be there? Just asking because i pulled the efi fuse before i rechecked for any codes.

 

[Joel W.]

Yes, you are correct, It will no longer be there once fixed.

 

[supra_89_vang]

Thanks a lot for all of you guy’s help. Does any one know what the deal is when I have the engine light flashes continuously than the code 51 comes out a few seconds after wards. Some times when I recheck my codes, I get the code 31 (AFM sensor) and the code 51 together. Some times just only the code 51. And some times just the Code 31 only.

Do you think that the code 51 could be cause because I removed my AC and not because of the TPS? Also could the code 31 be because I was using a Lexus AFM upgrade instead of the MK3 AFM. What about the idel speed control (ISC) sensor, what is the difference between the idel speed control (ISC) in the non-turbo and turbo engine?

What kind of damage is need on the turbo in order to have the ECU send out the Code 34? What is the best way to check if I have a bad turbo and may be causing my engine no to work?

I think all my problems is because my top head, I think it is broken. I have some loud knocking on the valve cover as the engine warms up. My car idels at about 800 rpm when cold and than down to 500 rpm when warm. How can I check if my top head is broken?

Thanks a lot.

 

[DaSuprawolf]

aaaaaaaaaaaa compresion test?

 

[mkiiSupraMan18]

How can I check if my top head is broken?

Take the valve covers off and look and see if any place(s) look different than the others? That loud 'knocking' or however you referred to it is probably a lifter gone flat. I'd recomend running a bit of ATF in your oil. It fixed my problem.

 

[johnathan1]

lol^^ Ok, I'm going to to attempt this one...

Have you checked that your TPS is adjusted properly? I believe that the idle is increased when the A/C amplifier tells the ECU that the A/C is on, so check that...

What do you mean "causing my engine not to work"? Does it not idle? No power? What are the symptoms? Anyone reading would need A LOT more info to help you in the slightest bit...

 

[supra_89_vang]

Thanks

Joe

 

[shahee1]

Would a Code 51 keep your car from starting???

 

[JustAnotherVictim]

Would a Code 51 keep your car from starting???

I don't believe so.

 

[suprahero]

JJ..................:bowdown:


I love it when you grace us with your presence.................

 

[3p141592654]

Take the valve covers off and look and see if any place(s) look different than the others? That loud 'knocking' or however you referred to it is probably a lifter gone flat. I'd recomend running a bit of ATF in your oil. It fixed my problem.

The 7M uses buckets and shims. Nothing to go flat I'm afraid! A knock means either a valve is stuck for some reason, or massive wear in the valvetrain (most likely the cam bearings).