Hey guys, I am stumped and really need some help. I purchased this car about 6 weeks ago: http://www.supramania.com/forums/showthread.php?154191-My-91-Supra , it is a 91 ma70 with a jza70 swap. The car was a factory r154 car, and so is the jza70 ecu that is in it. I bought the car with the wrong headgasket installed (a 2jz without a specific hole needed on the 1jz engine shown in the build thread). Anyhow I spent 2 weeks taking my time and disassembling the 1jzgte back down to the headgasket and spent some time cleaning various pipes and the intake manifold, and putting it all back together.
Now for the problem. I noticed that the #2 (rear) knock sensor by the starter, looked like this:
So I ordered a 2jzgte one with this part number:
The car was professionally wired when it got the 1jz swap by these guys: VIP performance in Portland OR. I checked to make sure the ECU was getting a strong connection from the knock sensor wires, and everything tested out great. I even put a new knock sensor plug on the #2 because the tab was broken off and had some remains of superglue (I assume from the previous owner). Anyhow the new one tested out great and the ECU wires look great. I have searched on every forum I could find, related to the 1jz knock sensor issue I might be having, but nothing. I'm really at a loss here.
Basically, the car starts up perfectly fine, but when I rev it to about 4k rpm, it throws the code 52, runs in limp mode, and then clears as soon as I shut the car off. To my knowledge, the code 52 represents a fault in either the knock sensor itself or the wiring to the ECU or the ECU itself.
So here's the list version of what I have done and things that checked out fine:
1.) Replaced knock sensor #2
2.) Spliced in a knock sensor plug @ #2
3.) Let the car sit several times overnight with no batt to reset the ECU
4.) The cars ECU was sent off to DM a couple years ago to get new caps soldered on (and ran fine afterwards)
5.) Checked the continuity of the wires between knock sensors and ecu
6.) removed knock sensor #1 to inspect for damage that I may have missed when the head was off (but everything was fine) and reinstalled.
Please keep in mind that I am a computer hardware/electrical engineer and know my way around engines ect. Anyone else have any ideas? Thanks
Now for the problem. I noticed that the #2 (rear) knock sensor by the starter, looked like this:
So I ordered a 2jzgte one with this part number:
The car was professionally wired when it got the 1jz swap by these guys: VIP performance in Portland OR. I checked to make sure the ECU was getting a strong connection from the knock sensor wires, and everything tested out great. I even put a new knock sensor plug on the #2 because the tab was broken off and had some remains of superglue (I assume from the previous owner). Anyhow the new one tested out great and the ECU wires look great. I have searched on every forum I could find, related to the 1jz knock sensor issue I might be having, but nothing. I'm really at a loss here.
Basically, the car starts up perfectly fine, but when I rev it to about 4k rpm, it throws the code 52, runs in limp mode, and then clears as soon as I shut the car off. To my knowledge, the code 52 represents a fault in either the knock sensor itself or the wiring to the ECU or the ECU itself.
So here's the list version of what I have done and things that checked out fine:
1.) Replaced knock sensor #2
2.) Spliced in a knock sensor plug @ #2
3.) Let the car sit several times overnight with no batt to reset the ECU
4.) The cars ECU was sent off to DM a couple years ago to get new caps soldered on (and ran fine afterwards)
5.) Checked the continuity of the wires between knock sensors and ecu
6.) removed knock sensor #1 to inspect for damage that I may have missed when the head was off (but everything was fine) and reinstalled.
Please keep in mind that I am a computer hardware/electrical engineer and know my way around engines ect. Anyone else have any ideas? Thanks
