knock sensor replacement

supraheelfan · 03-23-2011, 04:09 PM

Anybody have any tips on replacing a knock sensor? Any other routine check ups recommended when replacing knock sensor?

Travis89Turbo · 03-23-2011, 09:47 PM

Yes. Chances are your knock sensor themselves are not bad. Most likely the wiring to the ecu from the knock sensor its a real common problem and pretty easy to do.

Here is a good link
http://www.supras.com/06/techcenter/display.php?QID=69

supraheelfan · 03-23-2011, 10:00 PM

ok thanks. In cygnus what section do I pull up to see the layout of the knock sensor?

Travis89Turbo · 03-23-2011, 10:13 PM

Not sure. But both are under the intake manifold. The front one is easy to get to just behind the alter. And above the ground bolt. The back one not so much you have to pull the starter to get the plug off. Or to replace the sensor.

toyotaguy4x4 · 03-23-2011, 10:21 PM

Does anyone know the pin numbers going into the ecu for the knock sensors. My car is setting a 52 code and i have no power going to the sensors. Oh and how much voltage does the knock sensors have going to them.

Sonyps307 · 03-23-2011, 10:50 PM

You have to find the KS wire coming from the ECU harness. There are three ECU harnesses connected to the ECU, the one that has the KS wire is the harness in the middle, it's the only two transparent wires there on the middle harness. Even if it's not on the middle ECU harness, you should be able to find because it's the only two transparent wires out of all those three harness wires (for all MK3yrs). DO NOT cut the two wires at the harness, cut it at the furthest point away from the ECU harness (where the harness electrical tape ends and where you start to see the color wires for the first time). You should have about 5 to 6 inches of KS wire on the ECU harness after you cut at where the electrical tape ends.

toyotaguy4x4 · 03-24-2011, 02:00 AM

Ok I found the 2 wires at the ecu. I havent had much time to work with it but I have checked power at the ks connector on the engine with my power probe. Its not showing any voltage but instead it is showing a ground this is the part I have been trying to understand

Sonyps307 · 03-24-2011, 02:16 AM

That is because the wire that is for the ks is like a coax cable the main wire inside with a bigger ground outside wire casing so the wire doesn't get interference and the outer wire is grounded some where to the body. So to do the rewire you need small coax cable and solder the wire inside to the connetor and the outer casing wire to a ring lug then ground it. Took me and hour to remover the alt, solder and run the wire but I have a 7mge and it only has one KS.

toyotaguy4x4 · 03-24-2011, 04:46 PM

Thanks, im checking up on everything today. One question the toyota dealer here said that the part number to the ks connector fits a 4runner.Is this correct before i order the 2 connectors

Sonyps307 · 03-24-2011, 10:19 PM

Yea I think they have to same knock sensor and the same problem with the wire braking.

03-23-2011, 04:09 PM	#1
supraheelfan 3" Exhaust Join Date: Feb 2011 Location: Wilmington, NC Posts: 178	knock sensor replacement Anybody have any tips on replacing a knock sensor? Any other routine check ups recommended when replacing knock sensor?

03-23-2011, 09:47 PM	#2
Travis89Turbo 12psi boost Join Date: Jul 2010 Location: Utah Posts: 332	Yes. Chances are your knock sensor themselves are not bad. Most likely the wiring to the ecu from the knock sensor its a real common problem and pretty easy to do. Here is a good link http://www.supras.com/06/techcenter/display.php?QID=69 __________________ 1995 Toyota Supra SE 71k miles. Master power T70 stock 2jzge 1989 Toyota Supra. 1jzgte swap 5 speed of course.. Driftmotion 60-1 single turbo kit. Cxracing FMIC. 2jz 550cc injectors... soon to come..... EMS Stinger. BC 264 cams 680cc injectors Spec stage 4 clutch and A LOT of boost!------SOLD 1999 Ford F350 diesel 2004 Jaguar XJR Supercharged If it hasnt broke you haven pushed it hard enough!!

03-23-2011, 10:13 PM	#4
Travis89Turbo 12psi boost Join Date: Jul 2010 Location: Utah Posts: 332	Not sure. But both are under the intake manifold. The front one is easy to get to just behind the alter. And above the ground bolt. The back one not so much you have to pull the starter to get the plug off. Or to replace the sensor. __________________ 1995 Toyota Supra SE 71k miles. Master power T70 stock 2jzge 1989 Toyota Supra. 1jzgte swap 5 speed of course.. Driftmotion 60-1 single turbo kit. Cxracing FMIC. 2jz 550cc injectors... soon to come..... EMS Stinger. BC 264 cams 680cc injectors Spec stage 4 clutch and A LOT of boost!------SOLD 1999 Ford F350 diesel 2004 Jaguar XJR Supercharged If it hasnt broke you haven pushed it hard enough!!

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03-23-2011, 10:00 PM	#3
supraheelfan 3" Exhaust Join Date: Feb 2011 Location: Wilmington, NC Posts: 178	ok thanks. In cygnus what section do I pull up to see the layout of the knock sensor?

03-23-2011, 10:21 PM	#5
toyotaguy4x4 Stock Join Date: Jan 2011 Location: clinton north carolina Posts: 12	Does anyone know the pin numbers going into the ecu for the knock sensors. My car is setting a 52 code and i have no power going to the sensors. Oh and how much voltage does the knock sensors have going to them.

03-23-2011, 10:50 PM	#6
Sonyps307 Lexus & 550's Join Date: May 2010 Location: Baltimore Posts: 526	You have to find the KS wire coming from the ECU harness. There are three ECU harnesses connected to the ECU, the one that has the KS wire is the harness in the middle, it's the only two transparent wires there on the middle harness. Even if it's not on the middle ECU harness, you should be able to find because it's the only two transparent wires out of all those three harness wires (for all MK3yrs). DO NOT cut the two wires at the harness, cut it at the furthest point away from the ECU harness (where the harness electrical tape ends and where you start to see the color wires for the first time). You should have about 5 to 6 inches of KS wire on the ECU harness after you cut at where the electrical tape ends.

03-24-2011, 02:00 AM	#7
toyotaguy4x4 Stock Join Date: Jan 2011 Location: clinton north carolina Posts: 12	Ok I found the 2 wires at the ecu. I havent had much time to work with it but I have checked power at the ks connector on the engine with my power probe. Its not showing any voltage but instead it is showing a ground this is the part I have been trying to understand

03-24-2011, 02:16 AM	#8
Sonyps307 Lexus & 550's Join Date: May 2010 Location: Baltimore Posts: 526	That is because the wire that is for the ks is like a coax cable the main wire inside with a bigger ground outside wire casing so the wire doesn't get interference and the outer wire is grounded some where to the body. So to do the rewire you need small coax cable and solder the wire inside to the connetor and the outer casing wire to a ring lug then ground it. Took me and hour to remover the alt, solder and run the wire but I have a 7mge and it only has one KS.

03-24-2011, 04:46 PM	#9
toyotaguy4x4 Stock Join Date: Jan 2011 Location: clinton north carolina Posts: 12	Thanks, im checking up on everything today. One question the toyota dealer here said that the part number to the ks connector fits a 4runner.Is this correct before i order the 2 connectors

03-24-2011, 10:19 PM	#10
Sonyps307 Lexus & 550's Join Date: May 2010 Location: Baltimore Posts: 526	Yea I think they have to same knock sensor and the same problem with the wire braking.