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Join Date: Apr 2008
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P0325 Knock Sensor Circuit 1 Malfunction
Ok, I hate creating threads, but this damn knock sensor issue has been troubling me to no end and I'm out of ideas.
Long story short, after the new engine was put in, CEL was on with knock sensor circuit 1 malfunction. Replaced knock sensor, no change. Replaced connector, no change. Replaced knock sensor again with another one, no change. Replaced ECU with a used ebay one, no change.
Brought it to a family "friends" garage, (not too friendly anymore) and $800 later (replaced connector with new one from toyota, replaced knock sensor with new one from toyota, "replaced" wire with a "new" one, but it didn't look like it) and still has CEL on. That was last summer.
Then when I pulled the engine, I re-did the wiring myself with a new wire, soldered, shielded, covered in tape, shielded with that plastic looming stuff, taped again, more looming, more tape, more tape and more tape.
Still...CEL is on...Hooked it up to an oscilloscope today and the knock sensor checked out fine, so that works.
1) there's no way I'm getting to that wire again, it's too buried in there.
2) What's left to check? I'm out of ideas. My dad and mechanic say get another ECU, but I wanted opinions before I spent money on that.
The ECU, wiring and knock sensor are the only things in this circuit...so what else can I check? I need this fixed so I can pass inspection as I was due last month...