re-flash chip while still in ECM??
12-07-2006, 02:00 PM
#1
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Car: 1967 C10 Pickup
Engine: TPI 305, Megasquirt
Transmission: TH400
re-flash chip while still in ECM??
I want to build an interface that will allow me to re-flash my SST27SF512 while it is still installed in the ECM. If I run a ribbon cable from the chip to my Willem programmer, correct pin arangement of course, with Key Off on the ECM could I reflash it without physically removing it from the ECM, or will other ECM circuitry cause problems or potential damage anything??
I know there are the NVS module, and emulation and such..but I wondering if this would work. anyone tried it?
I know there are the NVS module, and emulation and such..but I wondering if this would work. anyone tried it?
12-07-2006, 03:28 PM
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Car: 1988 Monte Carlo SS
Engine: 5.7L TPI
Transmission: T5
Axle/Gears: 3.73
Bad idea, for various reasons. Here are two:
1/ the voltage applied to Vcc of the SST27SF512 is > 5.0V during the erase cycle
2/ the Vcc pin, which needs to be powered, would in effect power up the entire ECM....
1/ the voltage applied to Vcc of the SST27SF512 is > 5.0V during the erase cycle
2/ the Vcc pin, which needs to be powered, would in effect power up the entire ECM....
12-08-2006, 02:36 PM
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Car: 77 CJ7
Engine: AMC 401 w/ 454 TBI & 8746 ECU (61)
Emulator alternative
A ZIF socket makes chip swaps a breeze. I suppose you could use a ribbon cable to extend the socket outside of the ECU if necessary. Fwiw an emulator is money WELL spent.
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