1990 civic dx voltage on blk yellow to ground at distributor no voltage on wht blue wire at distributor with ignition on

 

wht/blu wire should be ground so that's good there isn't any voltage on it.
Small white and blu/yel are also grounds.

You said DX, but it seems you have a swap, right?
DPFI distributor (found on the DX) does not have a blk/yel or a wht/blu.

 

Hey 4dEF thanks for the reply,I do know that's its not the original engine, how ever on the 2 pin & 5 pin plugs at the distributor I had 12V to ground on both wires wht blu & blk yel this according to haynes manual I'm using, in addition I changed the ignition switch after changing the distributor # 1 on # 2 now

 

do you have any codes showing on the ECU?

 

Gentleman replacing the igniter solved my problem earlier in year,but this last fail I decided to change the entire distributor, there are no trouble codes also I have no idea what a A/T control unit is??? I'd like to know on mechanical side of the ignition switch is there contacts involved when switching the positions Acc I II &III

 

A/T = "Automatic Transmission control unit"