Chrysler Repair: 98 chrysler sebring 2.0: stalls, chrysler sebring, voltage pulses

Question
Hi kevin I have a good one for you Im a mercedes tech trying to help my brother fix his car the car will start cold and run for 30secs-1min then stall it cranks and wont start. After We put it on the scanner no codes, we got no cam and no crank signal during cranking, replaced both no change, replaced coil no change, tested wiring on cam signal line 0.0 ohm, jumped asd relay after car sat awile, ran then stalled, same thing, fuel pressure is good, there is no spark. I am having him unplug o2s next to see if its a closed loop thing, sometimes unpluging the ecm will get it to start for a min then stall again but its not reliable enough to justify replacing the ecm. the car has receintly had a head, water pump and timing belt replaced but ran great for 2 weeks prior to this problem so it may be unrelated another tech friend of ours assembled it and has since rechecked and I trust his work so im treating this as a new problem. do you think this could be the computer? if so is there a way to be sure before we replace it? thank in advance for any insight you may have

Answer
Hi Jason,
No spark with no codes (and having replaced the coil and sensors) is unusual. Have you tried to verify that both sensors are indeed producing a signal when you test for voltage pulses when turning the engine over by hand (5V to 0.3V,and doing this immediately after it stalled)? If both are producing signal, and you have a new coil, and you tested the coil driver wire and looked for signal on it, then one has to wonder about the ecm or perhaps power not getting to the ecm (particularly the lack of any codes makes me wonder about the ecm). Can you clarify which Sebring this is as I don't recall the 2.0 being used with that nameplate.
Sorry for the delay in a response to your question but I just found it in the 'pool' to which Kevin had referred today.
Roland
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