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There are 2 ignition 1 voltage circuits supplied to the engine control module (ECM). The first ignition circuit is
provided by the powertrain relay, through a fuse. This ignition 1 voltage circuit supplies power to all the
internal ECM circuits associated with the throttle actuator control (TAC) operation. The second ignition 1
voltage circuit is supplied by the ignition switch through a fuse, and is used to power the remaining internal
ECM circuits. If the ECM detects a voltage difference between the 2 ignition 1 voltage circuits, DTC P1682
will set.
Get a subscription to alldatadiy.com and print out the troubleshooting steps. You've already wasted more than the cost of a good manual by replacing a good switch.
If it is around 100k miles it maybe the ECM they fail a lot on those.. If you can get a scan and see if the ECM is bad let me know I maybe able to rebuild yours/replace it.
I had the exact problem with my 1993 chevy c1500. I found that the IAC was sticking so the engine would die at idle after warming up and the ignition module was pulsing the ECM intermittently after the engine warmed up so the fuel pump wasn't being turned on after the engine died....I replaced the ignition module and the IAC valve and all is good. I don't know if testing the ignition module reveals that it isn't sending pulses to the ECM.
Hey Dennis,, DON"T BECOME A PARTS REPLACER..(some people who "call themselves mechanic's" are just that!),.. .take this Dodge to a qualified professional... talk to them..
You say warm... do you mean full running temp?? .if so, you may be experiencing a vapor lock,, fuel "boils" when the engine is hot.. when it cools its no longer hot enough to cause this..(S.W.A.G.)
When the engine warms up engine management sensor warms up and the resistant builds up,signals dont reach the ECM,out all that was replaced what about the cranksensor?that is a popular failure when warm
Not a solution but i am going through the exact same nightmare and same symptoms with my 1991 mazda b2200. I've apwnt over two grand to have my rebuilt TWICE and my alternator replaced and still does the same thing just starts only to die 2 seconds or so later unless i let it warm up to its max but will still die when taking turns and stopping at lights.
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