What part of ecm controls keep alive memory
1988 Dodge Dakota
are you sure this is the car? 1988?
this car had 5 different engine options and ECU. to match them.
the PCM (or old ECU) has 1 pin, that is called memory.
this pin is hot at all time, battery not dead, or disconnected.
its not like todays car, which have complex learn modes, this is 88 year , the first years of EFI (usa cars)
why not ask the question from a symptom perspective or state the concern.
This memory stores the DTC errors, and short and long term fuel trim.
nothing complex here. just basics.
now ill answer from inside the ECU.
the chip that does this is CMOS, NV RAM.
it is a memory chip. (off the shelf) and is held at 12vdc key off by a single external pin.
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see 2.5L see pin A41 , that is the memory pin. a red wire.
if not 2.5L then please say what you have (under dah, hood)
and what is wrong.? "symptoms"
on Jun 07, 2014