scenario:
one morning i start my bird (warmup) and car just dies. tried starting again and no luck, crank wont catch at all.

troubleshooting facts so far:

**2 problems**
1) tested wires underneath rear seats and only getting .025 volts when ignition on. looked at schematics and supposed to be getting 12v drive from ECM (the ECM?!?!?,awww man. dont tell me that...)

2) bypassed 4 wire relay and and jumped outer wires to complete circuit (what the relay is basically supposed to do when ingition on) and gettin 12v now, but pump no turn on (damn, pumps gone.)

so basically step #2 i was able to determine that the pump is out of commission. but step #1 is where i am stuck. could it be the ECM? is this a known issue? maybe something else?

any suggestions are appreciated...

thanks in advance! -john


------------------
'86WS7
Ram Air...
*EiyseWhite*

 

John,

Between the ECM and the fuel pump is a relay. It's most likely the problem, not the ECM.

As for the wiring under the rear seat, you might be better off checking the wiring near the fuel pump itself, so you can also check the ground continuity.

------------------
Later,
Vader
------------------
Justice and Freedom will Prevail

 

It's a little like this:



------------------
Later,
Vader
------------------
Justice and Freedom will Prevail

 

thanks VADER!!!, im gonna work on it this weekend. hopefully i'll get it up, but i'm a bit more confident now with you schematic.

thanks dude...!

------------------
'86WS7
Ram Air...
*EiyseWhite*

 

You could try running a wire straight from the battery to the connection in the back, and run a ground wire too and see if it kicks on if all else fails. Could be a wiring problem and it's an easy check before dropping the tank.