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

Joined
Nov 3, 2004
Messages
898
Location
Frankfort, Kentucky
 
 
 
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
 
Last edited:
Joined
Nov 3, 2004
Messages
898
Location
Frankfort, Kentucky
 
 
 
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.
 

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