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1G 1990 knock sensor circuit failure

Ryan4dc

Proven Member
163
0
Jul 16, 2010
Longview, Washington
Check engine light states I got a knock sensor failure. Replaced it with another knock sensor but this time it's only plugged in and resting on the fender. Same code. I believe it's a wiring issue and not a sensor issue. Will it cause a problem if I rewire the sensor directly to the ecu? Ie run a new set of wires to the knock sensor? Pulled on the wires on the harness side and bare wire was pulled from the taped section.
 

wrencher

Proven Member
362
40
Nov 20, 2005
Chicago, Illinois
Check engine light states I got a knock sensor failure. Replaced it with another knock sensor but this time it's only plugged in and resting on the fender. Same code.

The knock sensor needs the ground from being threaded in the block.
That might be an issue right there just plugging in the new one & not grounding it by installing.
 

Ryan4dc

Proven Member
163
0
Jul 16, 2010
Longview, Washington
Will have to try to install then. :hmm: alternator in the way. Will attempt a jumper wire with alligator clips to act as a ground temporary and rescan.
 

bastarddsm

Proven Member
5,418
1,252
Aug 26, 2003
Mendota, Illinois
I'm 96% sure it has to be in the engine. If it doesn't hear anything it assumes a fault..
 
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