I bought this car and the wiring harness is garbage. There is no wiring going to the knock sensors o i have no power. Is there a way to bypass the knock sensors so I can hold off on buying a new harness for now but still get my full power?
Knock Sensor Issues
- Thread starter suprastroker88
- Start date
Nope, no way to bypass it that I know of or heard of. Just install new shielded wire to them with some new ends from toyota and do a rewire. If anything send shaeff a pm and pick up one of his re-wire kits. It comes pretty much ready to go for cheap (way less than $100). All you have to do is run the new wire harness and tap into the wires at the ecu. Super easy to do.
well there is a way :hsugh:
you ground out the knock sensor wire both of them if there both gone
but i must warn you thou you are rowing in lake with hole in your paddle
can you get back your power yuppers but is it safe well not sure
the lazy people have done it before on many cars and it works fine
all in all you just lost the shitty 80's net under you
reason why is that thing is so slow my pda has more computing power then the stock ecu
edit ooops for got a line whould i do it no
you ground out the knock sensor wire both of them if there both gone
but i must warn you thou you are rowing in lake with hole in your paddle
can you get back your power yuppers but is it safe well not sure
the lazy people have done it before on many cars and it works fine
all in all you just lost the shitty 80's net under you
reason why is that thing is so slow my pda has more computing power then the stock ecu
edit ooops for got a line whould i do it no
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Don't ground them out. Rewire them properly. Use this method, but ground ONLY the ECU side:
http://www.supras.com/06/techcenter/display.php?QID=69
It would be stupid to run without knock sensors. And I'm not entirely sure that grounding them out would even work as Nash says it does. That seems like it would simply retard your timing and enrich the fuel mixture as a bad wiring job would... Maybe (hopefully) JetJock will chime in here. If anyone knows, he does.
http://www.supras.com/06/techcenter/display.php?QID=69
It would be stupid to run without knock sensors. And I'm not entirely sure that grounding them out would even work as Nash says it does. That seems like it would simply retard your timing and enrich the fuel mixture as a bad wiring job would... Maybe (hopefully) JetJock will chime in here. If anyone knows, he does.
Thanks for all the input. Im just going to try to rewire them. I was just told by someone that there was a way to bypass the knocks, but i always come here for the truth behind it.
shaeff;1315699 said:
i hate to say it but that wright up is crazy and over kill
a simple female blade crimp is all you need the knock sensor wire is grounded farther up the harness
you Can run with out the stock plug if you wanted
Nash - you're wrong. The knock sensor is a piezoelectric element that produces a voltage to the ECU when deformed. It's essentially a type of microphone and as such needs specialized wiring.
Voltage ranges from low-high depending on the frequency. Engine knock takes place at 7 kHz, this is where the ECU retards timing. The absence of voltage generates a code 52.
Shaeff is correct - it's stupid to run without the knock sensors. Frankly I'm surprised you even suggested it. You can keep this type of suggestion out of the Tech section in the future...I mean that.
Voltage ranges from low-high depending on the frequency. Engine knock takes place at 7 kHz, this is where the ECU retards timing. The absence of voltage generates a code 52.
Shaeff is correct - it's stupid to run without the knock sensors. Frankly I'm surprised you even suggested it. You can keep this type of suggestion out of the Tech section in the future...I mean that.
jdub;1315799 said:
hey i added the shifty eye's and i for got a line :sarcasm:
all so added it was not smart to do
i have yet to have an issue using a female clip
light goes away and i get a signal
plus at the ecu it is no longer shielded thus why i figure it grounded some were els were not sure never took apart a stock harness and far as i know it's not grounded at the plug
http://www.cygnusx1.net/Supra/TechTips/engine_error_codes.aspx
52 Knock Sensor Signal
Diagnosis
* Open or short circuit in knock sensor signal.
Trouble Area
* Knock sensor circuit
* Knock sensor
:3d_frown:
52 Knock Sensor Signal
Diagnosis
* Open or short circuit in knock sensor signal.
Trouble Area
* Knock sensor circuit
* Knock sensor
:3d_frown:
Nash - the problem is what you post is very difficult to decipher...even more so when you are not being specific. It might be best at times just to STFU. This is one of those times...time for you to exit this thread.
Suggest you take my advice.
Suggest you take my advice.
http://www.supramania.com/forums/showthread.php?t=87486
Just order the kit from Shaeff and call it a day.
If it still throws a 52 get a new sensor.
Just order the kit from Shaeff and call it a day.
If it still throws a 52 get a new sensor.
I'm confused. Everyone claims this code 52 knock sensor problem is a deteriorating wiring problem.
However, I just finished a complete OEM Toyota rebuild (new short block, head, cams, everyfreakinthingIswear except cps!) including two new knock sensors and a complete new OEM Toyota engine wiring harness. I am getting the ubiqutous code 52. If this is a problem with deteriorating wiring, why is mine getting this code. This wiring harness is only four months out of the Toyota bag.
Surely there must be some other answer. New Supras didn't have this problem, or did they? My other 89 (white) was running over 300rwhp for more than 5 years w/o any code 52 problems.
I actually had this wiring harness on my white car till May, when the motor let go. I bought the burgandy one May4th, built the motor, and swapped the wiring harness from white to burgandy.
Now I get code 52?!
Please, someone, anyone, enlighten me. I understand the microphone concept and the piezoelectric signal sent from vibration induced deformation, but how does this relate to new Supras, or ones with all brand new OEM Toyota parts? Why didn't they throw code 52's from the day they rolled off the factory floor if the stock wiring was so inadequate?
Anyone dare to venture further into this problem? To me, it would appear that the much touted Schaeff (sp?) rewire solution is actually making up for some other shortfall in the system that still remains in all such rewired cars.
However, I just finished a complete OEM Toyota rebuild (new short block, head, cams, everyfreakinthingIswear except cps!) including two new knock sensors and a complete new OEM Toyota engine wiring harness. I am getting the ubiqutous code 52. If this is a problem with deteriorating wiring, why is mine getting this code. This wiring harness is only four months out of the Toyota bag.
Surely there must be some other answer. New Supras didn't have this problem, or did they? My other 89 (white) was running over 300rwhp for more than 5 years w/o any code 52 problems.
I actually had this wiring harness on my white car till May, when the motor let go. I bought the burgandy one May4th, built the motor, and swapped the wiring harness from white to burgandy.
Now I get code 52?!
Please, someone, anyone, enlighten me. I understand the microphone concept and the piezoelectric signal sent from vibration induced deformation, but how does this relate to new Supras, or ones with all brand new OEM Toyota parts? Why didn't they throw code 52's from the day they rolled off the factory floor if the stock wiring was so inadequate?
Anyone dare to venture further into this problem? To me, it would appear that the much touted Schaeff (sp?) rewire solution is actually making up for some other shortfall in the system that still remains in all such rewired cars.