so we've been messing with a 1996 chrysler concorde 3.5L, for about a week now, and we have a no start, no spark. It cranks. We have signal, power and ground at crank and cam sensor. We have power to our coils, but no signal to coil. We've tested continuity in wires, looked for loose grounds. We've tried everything time and time again. It cranks fine, and you can hear fuel pump turn on, and there's pressure in the fuel lines. since we had signal, and fuel pump, we didn't think it was auto shut down.

We tried to just throw in a crank sensor last night for ****s because we're at our wits end, and whats better than throwing parts at it?
...no luck.

so we thought it had to be the ignition module in the PCM, we got one from the junk yard, and its not working either? Do you have to unhoook the battery and clear the codes or anyting with the PCM??

the flash diagnostics only gave us a low battery code.

What could we have missed? any other ideas? Thanks in advance.

 

oops, never mind.

 

oops, nevermind on the reply.


the question still stands.

 

How is the timing belt (broken maybe)?

The ASD has more than one contact set, you could swap in a relay.

The ASD will energise, and then de-energize if it dosn't get a CAM possition signal (the crank sensor comes in latter).

Try this, put a test light on the B+ contact of the coil pack (should be a dark green with orange strip wire), be CAREFUL not to spread the contacts as this can cause the very problem you are having!! Turn the key to the on pos.and leave it there. The test light should flash once. If it didn't flash, the ASD relay didn't energize. There are thigs to check if it flases once also. Let me know what happens.

 

new belt, we just did head gaskets.

we've pretty much done everyting else you've said. swapped relays, checked batteyr power, checked coil wires, checked all signals at cam and crank. serioulsy, we've done everything we were supposed to. Even checked AllData.

thats why we're so stuck.

 

hey it sounds like it could be a computer problem.. did u check the pressure of fuel with a gauge? i think u said u did but yes it sounds more of a computer problem

 

we don't have a fuel pressure guage, but we've squirted it out of the schrader valve a few times, so its definately there.

plus, we've got cam sensor signal, and we've got no spark at the coils.

 

So what was the outcome of the test? Depending on the answer lies the answer to a no spark issue.

 

we had already tested signal at the coil driver wires. We have a constant voltage at all of them. so its pretty much got to be the ignition control module not pulsing. so PCM.

 

Did you ever try a test light? OK, if not, a constant voltage could be a blinking light at a fast pulse. Try the light. If it stays on, it sound like a short circuit. With the key in the on position (not start or running/turning over) the light shoul only flash once. Is this not the case?

3 possible outcomes:
1. light stays on (or pulese on constantly)
2. Light blinks
3. Light never flashes

Note: This can be applied to a multimeter, but is much simpiler to see as a light.