CODE-12 on the 1JZ:(

[87soup]

12 RPM Signal


Diagnosis

* No "NE" or "G" signal to ECU within 2 seconds after engine has been cranked.

Trouble Area

* Distributor, or CPS, circuit
* Distributor or CPS
* Starter signal circuit
* ECU
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Now the car cranks for days, but it will not fire... Were can i find this "NE" or "G" signal????

Thanks SM

 

[Guyana00]

NE comes from the crank sensor.
G wires come from the cam position sensors.

 

[87soup]

So i thnk i may have found the crank sensor.. Is it behind the tensioner for the timing belt?

and for the cam sensors... Is it the two plugs next to the fuel rail???

Anyone got pics???
or any info where to start on this problem?

 

[JonoTurbo]

You're right about the cam sensors.

As for the crank sensor, it plugs into the bottom of the motor just above the oil pan and in the alternator area. It might be behind the timing tensioner as you describe, but it's the only sensor which plugs into the block near the alt.

I would check the crank sensor first, as the engine will usually run with a bad cam sensor, just really poorly.