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Sorry, Super6. The engine computers on Chrysler Corp vehicles, with carbs, are 1st generation "dumb" computers. Thay do not have the ability to "talk" to "code readers", scan tools, or flash check engine lites. It wasn't untill fuel injection, that the computers could talk back.
Reviving an old post as I finally obtained some information on the matter.
Below is quoted from page 25-31 of a 1986 Factory Service Manual for RWD Dodge Trucks and Ramchargers:
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The ESA/EFC (Electronic Spark Control/Electronic Fuel Control) computer has been programmed to monitor several different component systems. This monitoring is called On-Board Diagnostics. If a problem is detected with a monitored circuit often enough to indicate an actual problem, its Fault Code is stored in the computer for eventual display on the Diagnostic Readout Tool C-4805. If the problem is repaired or ceases to exist, the computer cancels the Fault Code after 20-40 ignition key on/off cycles. The memory can also be cleared by disconnecting the computer 14-way connector for one minute and then reconnecting it.
Page 25-32 of the same manual goes on to list Fault Codes 00, 11 through 18, 21 through 33, 55, and 88.
The manual makes no reference to being able to retrieve the codes through the ignition key on-off procedure, but I am still quite certain it worked on my '87 D150.
I gained posession of the '86 FSM because I remember a former/no longer active member (Craig) stating he had looked at both an '86 and '87 FSM side by side, and said they were identical. So I finally have complete information for my truck.
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Must've been an interesting nonstandard computer unit, then, because flash codes did
not officially arrive until EFI. You didn't discard a
rare, one-of-none, super-double-intergalactic-secret factory prototype, did you?

THIS PICTURE is of the ESA/SCC computer and wiring ends from my truck. If you look closely at the connector furthest right, it has seven visible pins. It is double layered, and I assume is the 14-pin connector reffered to in the FSM. The computer also had a second connector, with I believe 10 pins.
I hope that sheds a little light on the subject.
-S/6