Toyota Help

RD TRCTR · 03-09-2008, 03:07 PM

I've got a 1985 'Yota with the 22REC engine. I am currently getting the MIL (code 12) for the knock sensor. The only issue is that the engine does not have a knock sensor. I've had this truck for a while now and all of a sudden this code shows up. I did just recently replace the TPS. If any one can provide some help it'd be greatly appreciated.

4RunnerAdam · 03-09-2008, 08:04 PM

You mean the knock sensor has been removed?

It should be near the oil filter. Has a green wire going to it.

RD TRCTR · 03-10-2008, 12:11 PM

Is the truck supposed to have a knock sensor? It ran just fine with no check engine light until here recently. I guess I'm confused as to why the CEL wasn't on and then all of a sudden it came on. Thanks for the help.

4RunnerAdam · 03-10-2008, 05:40 PM

Yup, should have a knock sensor. Why it worked without one I don't know. Parts store are showing a new knock sensor for $155

I'd find a used one.

krawlin85toy · 03-10-2008, 08:54 PM

Had the same problem at 1 time,could be a knock sensor,tps,and or dist. my problem was the wire to the knock sensor has to be shielded after I replaced the end and have trouble free since. 4tears knock on wood!

RD TRCTR · 03-13-2008, 06:48 PM

I took your guys advice and finally looked for the knock sensor today. I couldn't find it. I looked all over the intake side of the engine. I then called a dealer and gave them the VIN. According to them, it should have a knock sensor and it's located on the exhaust side of the engine (?). I figured that since I had replaced the TPS, that maybe I didn't set it right. So, I followed the directions in the repair manual and online. Took the truck for a drive, CEL is back on for code 12, knock sensor. Do I need to pull the plenum to find the knock sensor? I did replace the injectors in January. I also found the connector that goes to the knock sensor and it has a decent amount of grime in it leading me to think that it has never been hooked up. The truck was built in November of '84. Thanks a lot for your advice.

03-09-2008, 03:07 PM	#1
RD TRCTR Join Date: Nov 2007 Location: Troy, OH Posts: 94	Toyota Help I've got a 1985 'Yota with the 22REC engine. I am currently getting the MIL (code 12) for the knock sensor. The only issue is that the engine does not have a knock sensor. I've had this truck for a while now and all of a sudden this code shows up. I did just recently replace the TPS. If any one can provide some help it'd be greatly appreciated.

03-10-2008, 12:11 PM	#3
RD TRCTR Join Date: Nov 2007 Location: Troy, OH Posts: 94	'Yota help Is the truck supposed to have a knock sensor? It ran just fine with no check engine light until here recently. I guess I'm confused as to why the CEL wasn't on and then all of a sudden it came on. Thanks for the help.

03-13-2008, 06:48 PM	#6
RD TRCTR Join Date: Nov 2007 Location: Troy, OH Posts: 94	'Yota Help I took your guys advice and finally looked for the knock sensor today. I couldn't find it. I looked all over the intake side of the engine. I then called a dealer and gave them the VIN. According to them, it should have a knock sensor and it's located on the exhaust side of the engine (?). I figured that since I had replaced the TPS, that maybe I didn't set it right. So, I followed the directions in the repair manual and online. Took the truck for a drive, CEL is back on for code 12, knock sensor. Do I need to pull the plenum to find the knock sensor? I did replace the injectors in January. I also found the connector that goes to the knock sensor and it has a decent amount of grime in it leading me to think that it has never been hooked up. The truck was built in November of '84. Thanks a lot for your advice.

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03-09-2008, 08:04 PM	#2
4RunnerAdam Join Date: Apr 2007 Location: near eastgate mall Posts: 171	You mean the knock sensor has been removed? It should be near the oil filter. Has a green wire going to it.

03-10-2008, 05:40 PM	#4
4RunnerAdam Join Date: Apr 2007 Location: near eastgate mall Posts: 171	Yup, should have a knock sensor. Why it worked without one I don't know. Parts store are showing a new knock sensor for $155 I'd find a used one.

03-10-2008, 08:54 PM	#5
krawlin85toy Join Date: May 2007 Location: Hamilton Posts: 265 Images: 76	Had the same problem at 1 time,could be a knock sensor,tps,and or dist. my problem was the wire to the knock sensor has to be shielded after I replaced the end and have trouble free since. 4tears knock on wood!