Desperately Need input on dealing with the infamous code 52- "knock sensor fault"
On a 93 toyota pickup 3vze
Everything i know about this code always leads to these 4 things, typically in this order
1. Knock sensor pigtail
2. Wiring from ecu to knock pigtail
3. Knock sensor
4. Ecu

Pigtail was replaced with oem unit 10k miles ago when heads were rebuilt
I Replaced the knock sensor with napa echlin brand sensor
I then Replaced wire from ecu with a shielded coax cable and grounded out the coax shielding at the computer end only. I left the factory shielded ground in place so the wiring under the manifold is also shielded/grounded.
I then spliced in a factory new pigtail that goes to the ecu at the throttle body.
I then Replaced computer with a vin programmed reman'd unit.

Still code 52 with low power!!!

New knock sensor is putting out 7.5 millivolts while running at the pigtail, and i was getting about 14.5 millivolts at the ecu end before i swapped to a coax cable, (haven't retest with new cable)
Nothing is soldered yet for testing purpases, its all attached with spade quick disconnects for now

Im thinking the napa brand knock sensor is bad, or the abnormal grinding noise im getting from the distributor is messing with the knock sensor signal.

My next step is to likely buy a yota sensor and mount it to the lifting hook as im over wasting time on this and don't want to tear open the motor again.

 

[QUOTE=87xjmike;52409370]Desperately Need input on dealing with the infamous code 52- "knock sensor fault"
On a 93 toyota pickup 3vze
Everything i know about this code always leads to these 4 things, typically in this order
1. Knock sensor pigtail
2. Wiring from ecu to knock pigtail
3. Knock sensor
4. Ecu

Pigtail was replaced with oem unit 10k miles ago when heads were rebuilt
I Replaced the knock sensor with napa echlin brand sensor
I then Replaced wire from ecu with a shielded coax cable and grounded out the coax shielding at the computer end only. I left the factory shielded ground in place so the wiring under the manifold is also shielded/grounded.
I then spliced in a factory new pigtail that goes to the ecu at the throttle body.
I then Replaced computer with a vin programmed reman'd unit.

Still code 52 with low power!!!

New knock sensor is putting out 7.5 millivolts while running at the pigtail, and i was getting about 14.5 millivolts at the ecu end before i swapped to a coax cable, (haven't retest with new cable)
Nothing is soldered yet for testing purpases, its all attached with spade quick disconnects for now

Im thinking the napa brand knock sensor is bad, or the abnormal grinding noise im getting from the distributor is messing with the knock sensor signal.

My next step is to likely buy a yota sensor and mount it to the lifting hook as im over wasting time on this and don't want to tear open the motor again.

I know this was posted a while ago.. but I'm having the same issue. Was wondering if you ended up mounting that knock sensor on the outside engine hook and if it worked oitnfor you.?

 

I had the same trouble when I first got my 99 4Runner. Both knock sensors throwing codes. Replaced them with Napa sensors and pig-tails. Still throwing codes. Replaced the sensors with Toyota sensors, problem cleared. The sensors were installed in the default, OEM location.

Just thought I'd throw this out there.
Pat☺

 

Awesome thanks for the feedback