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L28ET crank position sensor

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Turns out the CAS was bad however my main problem was I wired the COP's and the injectors wrong.

I am embarrassed to say.

MS wires are labeled A, B, C, D, E, F and screwed up and wires them to #1, 2, 3 ,4 ,5 ,6 instead of firing order.

Engine runs good now..


I still have CAM Fault red light on tunerstidio. Can't find a good answer for that. I also have another wiring problem that I just found. I pulled the fuse that powers MS and the engine still fires up. I'll report back.

Edited by davek

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I know it's been a while on this post but I am having some issues installing my megasquirt gold box on my 1988 300ZX.


The main issue is with the crank angle sensor. So does the green wire from the crank angle sensor go to Cam+ or Crank+ on the gold box? Does the white wire from the CAS go to crank+?

BTW I'm using the DIY trigger wheel. 


I am running 6 individual coils and full sequential. I currently have the green wire going to cam+ and the white wire going to crank+ but I am getting strange signals on the composite logger. I attached a picture of what I'm getting.



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Thanks for the info. 

So on the original stock ecu the G/W wire is the outer 1° crank signal and the G/B is the inner 120° cam signal but when using the modified DIY cas trigger wheel for sequential fuel and COP ignition it's reversed. So the G/W wire goes to the cam+ wire and the G/B wire goes to the crank+ wire into the goldbox ms3. 


Also on the short distributor side 4-wire harness in my 300zx the

G = G/W

W= G/B

R= +12V

B= neg sensor ground



Edited by rick88ss

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