Code 12, Knock sensor signal or RPM signal. (1 Viewer)

[kybishop]

I pulled this code this morning on my 94 FZJ 80. It is for the knock control sensor signal or RPM signal.

Any guidance on what I need to look at here? I assume it has a knock control sensor somewhere? Could not find a dedicated thread on this one.

What is the RPM signal about? Are these related I assume being the same code number? If not I guess you just guess which it may be? I pulled codes because I have a low idle but my tach appears to be registering RPM's accurately.

Thanks.

KB

 

[kybishop]

Has anyone replaced the knock sensors on a 1FZ? Apparently it has two on the left side of the block. One in the front 1/3 of the engine and another in the rear 1/3. Wondering if anyone has the FSM that shows the knock control sensors and has the torque specs to tighten them to.

Thanks.