QuestionQUESTION: Answer;
Then we will have to develop a new theory of electrical voltage that explains how there can be 12V on one end of a wire and 0V on the other end when there is little to no resistance in between!
<grin>
What I was getting at was, what of the other things that the ASD relay powers? I presume that they must connect in parallel to the wire between the ASD and the coil pack. Is it not possible that one of them is so loading the ASD that no voltage is getting to the coil pack?
Steve
ANSWER: The ASD powers the coil and the 6 injectors. Maybe one of those wires is shorted to ground? the output wire of the ASD goes through a gray-colored 12-wire connector at the rear of the battery before it splits at a splice and sends 6 wires to the injectors and one wire to the spark coil plug.
---------- FOLLOW-UP ----------
QUESTION: What about the oxygen sensor and the alternator field coil? Are these not also powered by the ASD relay, or am I confused about that. Also, doesn't the SBEC switch ground to the injectors. Could the SBEC be a possible culprit in this? Unfortunately I do not have a schematic diagram for this, so I am working some what in the dark.
Steve
AnswerThe oxygen sensor is powered by the fuel pump relay as I mentioned earlier today. The field coil, you are correct, is also powered by the ASD and it could be grounded. But you didn't mention any problem with the charging system leading up to this problem, so that is why I didn't give it a thought, though it could be responsible for the sudden loss of power for the spark coil. So consider that as a possible cause too.
I thought you had told me that you were getting 12v out of the ASD while you were cranking it, however, also earlier today ("I have tested the ASD relay, and indeed there is 12v present on terminal 87, (the front pin), when the engine is cranked"). so I can't see how you would see 12V at its output and not have it at the spark coil unless the wire to the coil is "open". The SBEC does ground the other end of the each injector coil, and so any shorted-out injector could drag down the ASD voltage, but only once every two revolutions of the crank, and then momentarily. Now it is time for you to check out these possibilities so other questioners can have a chance, Steve.
Roland
