Chrysler Repair: 92 caravan, no spark, fuel pump relay, spark coil

Question
Hi Roland,

I told you wrong earlier, It was dark when I was putting jumpers on the relay, and I was jumpering the wrong one. I was putting the jumper on the fuel pump relay, hence the reason the fuel pump was coming on. When I noticed it today, I jumpered the ASD relay and the fuel pump did NOT come one. So then I jumpered the fuel pump relay as well, and the van will crank but not start still. With the ASD relay jumpered, I am getting volatage to the grn/orange wire on the PCM, to the B+ pin on the coil connector, and to the wires going to the injectors. I then got the voltmeter out and checked the voltage at the coil connector, and I'm getting over 12v on all 4 wires going to the coil. What controls this voltage? The PCM?

Answer
Hi Russell,
If I understand you correctly, you are getting 12V on all four wires at the spark coil. When you crank it, if the sensors and PCM were good, you would see the voltage on the other three wires at the plug to the coil drop to 0 once for every full revolution of the crank (you would want to do this test just the way you tested the sensors). If that doesn't happen and it appears that the sensors are pulsing, and you have no codes, then I believe the problem would point to the PCM. If it gets the pulses from the sensors then it aught to pulse those primary coil wires once per revolution. The no codes also suggests that the PCM is bad. No guarantees, of course.
Roland