Code 51

pandrade · 01-26-2012, 01:41 PM

I know there are a few of these threads around and i hate to cluter up the threads but i just got code 51 about 2 weeks ago. car was running fine but now the idle sits about 1,200-1,500 i cleaned the sencor whitch electrical parts cleaner and it helped for about a day but im still geting the code, i know i should replace the sencor but is there any aftermarket one that is a bit cheaper priced than one at advanced auto that will not compromise anything. my biggest concern is that since it idles higher i can let it spool down for a few minits but its still higher rpms than i would like to turn the car off at, dont want to prematurly wear the turbo bearings down

While im in there is there anyother part that afects my idel i should replace and or clean

cre · 01-26-2012, 05:34 PM

How did you clean the sensor? It's a sealed unit.

The TPS is a wear component and really should be replaced every 75K to 100K mi. The AFM, and ISCV will also affect your idle as will a vacuum leak.

Oil bearing turbos generally don't move much at all at anywhere close to idle speeds, you're not hurting anything by turning the car off from a 1,200RPM idle. I suppose one might even argue it to be beneficial as you're powering down with a significantly higher oil pressure than would be the case otherwise.

pandrade · 01-26-2012, 07:59 PM

cleaning wise i couldent do much because like you said i found out it was sealed so i made shure there wasent any debirs or corrosion on the spring,

i dont belive is a vacume leak because i checked all the hoses to see if there properly conected and in good shape, i think im gona end up having to buy a new one, its 75$ but if its a wear item i guss its just its time. now whith this replaced i should stop geting code 51 and idle correctly right?

cre · 01-26-2012, 10:50 PM

As long as it's properly calibrated and the code isn't due to the A/C circuit then yes, the code 51 should go away.

pandrade · 01-27-2012, 02:12 AM

i dident toutch any of the screws on the throtle body or asembly and it was ideling fine untill this code came up, so i shouldent need to recalibrate right?

cre · 01-27-2012, 02:14 AM

Pull it and test it with a meter. If it passes then it needs to be calibrated when reinstalled. Do note that if you press the throttle or turn on the A/C when in the diagnostic mode you'll get a code 51.

pandrade · 01-29-2012, 01:04 AM

when u say test it what am i looking for voltadge,ohms?
i usualy use a glow pen to see if its geting current but i also have a full voltmeter

cre · 01-29-2012, 04:01 AM

Easiest to use a continuity tester (a function most multimeters have) to test the IDL switch. You should have full continuity at rest and then when the interface tabs are ever so slightly rotated you should have zero continuity (resistance = infinity).

You're testing pins E2 and IDL.

EDIT:
Here's the TSRM info on testing the TPS while on the car: http://www.cygnusx1.net/Supra/Librar...spx?S=FI&P=101

Take it off the car to test the IDL switch if you're not getting any continuity when at rest with the positioning screws loosened.

pandrade · 01-29-2012, 11:31 PM

ok thanks this is a GREAT help maby even helpfull enought to go to FAQ

pandrade · 02-24-2012, 12:12 AM

just concluding this thread. i just installed the new TPS, the car runs great not, the code is gone im supprisingly geting a little more miladge which is always an extra, and a bit more responsive

01-26-2012, 01:41 PM	#1
pandrade 12psi boost Join Date: Mar 2011 Location: fort myers florida Posts: 345	Code 51 I know there are a few of these threads around and i hate to cluter up the threads but i just got code 51 about 2 weeks ago. car was running fine but now the idle sits about 1,200-1,500 i cleaned the sencor whitch electrical parts cleaner and it helped for about a day but im still geting the code, i know i should replace the sencor but is there any aftermarket one that is a bit cheaper priced than one at advanced auto that will not compromise anything. my biggest concern is that since it idles higher i can let it spool down for a few minits but its still higher rpms than i would like to turn the car off at, dont want to prematurly wear the turbo bearings down While im in there is there anyother part that afects my idel i should replace and or clean

01-26-2012, 05:34 PM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	How did you clean the sensor? It's a sealed unit. The TPS is a wear component and really should be replaced every 75K to 100K mi. The AFM, and ISCV will also affect your idle as will a vacuum leak. Oil bearing turbos generally don't move much at all at anywhere close to idle speeds, you're not hurting anything by turning the car off from a 1,200RPM idle. I suppose one might even argue it to be beneficial as you're powering down with a significantly higher oil pressure than would be the case otherwise. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

01-26-2012, 10:50 PM	#4
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	As long as it's properly calibrated and the code isn't due to the A/C circuit then yes, the code 51 should go away. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

01-27-2012, 02:14 AM	#6
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Pull it and test it with a meter. If it passes then it needs to be calibrated when reinstalled. Do note that if you press the throttle or turn on the A/C when in the diagnostic mode you'll get a code 51. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

01-29-2012, 04:01 AM	#8
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Easiest to use a continuity tester (a function most multimeters have) to test the IDL switch. You should have full continuity at rest and then when the interface tabs are ever so slightly rotated you should have zero continuity (resistance = infinity). You're testing pins E2 and IDL. EDIT: Here's the TSRM info on testing the TPS while on the car: http://www.cygnusx1.net/Supra/Librar...spx?S=FI&P=101 Take it off the car to test the IDL switch if you're not getting any continuity when at rest with the positioning screws loosened. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar ---> Last edited by cre; 01-29-2012 at 04:03 AM.

01-26-2012, 07:59 PM	#3
pandrade 12psi boost Join Date: Mar 2011 Location: fort myers florida Posts: 345	cleaning wise i couldent do much because like you said i found out it was sealed so i made shure there wasent any debirs or corrosion on the spring, i dont belive is a vacume leak because i checked all the hoses to see if there properly conected and in good shape, i think im gona end up having to buy a new one, its 75$ but if its a wear item i guss its just its time. now whith this replaced i should stop geting code 51 and idle correctly right?

01-27-2012, 02:12 AM	#5
pandrade 12psi boost Join Date: Mar 2011 Location: fort myers florida Posts: 345	i dident toutch any of the screws on the throtle body or asembly and it was ideling fine untill this code came up, so i shouldent need to recalibrate right?

01-29-2012, 01:04 AM	#7
pandrade 12psi boost Join Date: Mar 2011 Location: fort myers florida Posts: 345	when u say test it what am i looking for voltadge,ohms? i usualy use a glow pen to see if its geting current but i also have a full voltmeter

01-29-2012, 11:31 PM	#9
pandrade 12psi boost Join Date: Mar 2011 Location: fort myers florida Posts: 345	ok thanks this is a GREAT help maby even helpfull enought to go to FAQ

02-24-2012, 12:12 AM	#10
pandrade 12psi boost Join Date: Mar 2011 Location: fort myers florida Posts: 345	just concluding this thread. i just installed the new TPS, the car runs great not, the code is gone im supprisingly geting a little more miladge which is always an extra, and a bit more responsive

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
How to check diagnostic codes	suprra_girl	MKIII FAQ	10	12-27-2011 08:30 PM
TPS code 41...	Cyberguy1992	MKIII Supra	0	04-26-2011 08:14 PM
Damn code 51/31	Supra Saiyan	MKIII Supra	10	02-15-2011 10:57 AM
KS code, and no KS connector?	Scionguy	MKIII Supra	5	08-28-2008 08:15 PM
getting wierd error code and need general advice please	noredline	MKIII Supra	7	10-01-2006 05:23 AM