Help: Test Power to DME

[Srwilliams]

I have done something dumb. I was hooking up wires to my headlights and foglights with no problem, all while starting the car to make sure I was hooking up the correct wires. I must have started the car 15 times throughout this process with absolutely no problem.

Then out of the blue the car stopped firing. I mean it keeps cranking without starting. I checked and I am not getting any spark to the coil whatsoever and the fuel pump is not coming on. I cannot hear it clicking on when the car is trying to start.

I changed the coil as well as the dme relay. Still no spark to the engine and the fuel pump is not activated. I am now trying to troubleshoot.

It is my understanding that I need to first check to see if I have power coming into the DME and then going out of the DME. Can anyone explain to me in simple terms how to do this. I have a 1987 carrera. I took the seat out of the car and I am prepared to test the power at the DME. I just do not know what pins to check or how to go about checking the power source to and from the DME

Any help would be greatly appreciated.

[LJ851]

If you have a factory alarm system, it could be acting up. The power for your DME relay goes through the alarm brain.

[Srwilliams]

LJ851:

Thanks for the reply. I ruled out the factory alarm. Years ago I disengaged the factory alarm and so it is inoperable

[DRACO A5OG]

oh man, sound like the reference sensor.

get your DVM out and check the OHMs on both speed and reference sensor

[kidrock]

Here's a very helpful thread on testing the DME unit, as well as the speed and reference sensors.

Another 84 Won't Start Quandry

good luck, and please keep us posted.

[Srwilliams]

Kidrock:

Thanks for the site. went to it and read it and it gave me the exact diagnostic check that I needed.