Hey,

i am trying to bootstrap a SBEC II from a 1993 Minivan (Chrysler Town & Country).
I have the FTDI Cable set up and use inverted logic. I use a breadboard for chaning the wires back and forth for bootstrap.

I have another 1995-Model SBEC II which i use for testing. It works fine, i bootstrapped it and got the Code from the EEPROM three times to make sure everything works.

Using exactly the same method as on the 1995 SBEC II, the 1993 SBEC II will not work properly. MPTune gives the Error "Corrupted Boot program" or something like that.

Here the logs:

Code:
-BootSerial routine-(Called from LoadBoot)Using Boot Program Modular BootLoader for MP Tune - BootMainAll
total bytes returned on switch-on were 2 at 10:24:47.8696466
return byte 1: 0
return byte 2: 0
boot download routine is started.
boot baudrate = 7812
hi speed rate = 62500
sent FF byte
total bytes returned after sending 0xff were 2
return byte 1: 0
return byte 2: FF
sending boot program. length = 256
Boot send start time 10:24:49.8852053
Boot send finish time 10:24:50.1195756
Boot reread finish time 10:24:50.2133203
done sending boot program.  bytes returned = 255
read timeout set to 1640
bytes returned were:
8E 00 FF CE 10 00 CC 01 0C A7 2B E7 2D 0F CC 60 01 A7 3C E7 3F 8D 1F 17 8D 1C DD EE 8F 8D 17 17 8D 14 E7 00 F6 10 2E 2A FB E6 00 F7 10 2F 08 4A 26 EE DE EE 6E 00 36 FC 10 2E 85 20 27 F9 32 39 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 E0 
baud:7812
Boot program returned did not equal boot program downloaded
------------------
Can't read chip because boot program is not running properly
Code:
-BootSerial routine-(Called from LoadBoot)Using Boot Program Modular BootLoader for MP Tune - BootMainAll
total bytes returned on switch-on were 1 at 10:27:32.6219176
return byte 1: 0
boot download routine is started.
boot baudrate = 7812
hi speed rate = 62500
sent FF byte
total bytes returned after sending 0xff were 1
return byte 1: FF
sending boot program. length = 256
Boot send start time 10:27:34.6347600
Boot send finish time 10:27:34.8691250
Boot reread finish time 10:27:34.9628737
done sending boot program.  bytes returned = 255
read timeout set to 1640
bytes returned were:
8E 00 FF CE 10 00 CC 01 0C A7 2B E7 2D 0F CC 60 01 A7 3C E7 3F 8D 1F 17 8D 1C DD EE 8F 8D 17 17 8D 14 E7 00 F6 10 2E 2A FB E6 00 F7 10 2F 08 4A 26 EE DE EE 6E 00 36 FC 10 2E 85 20 27 F9 32 39 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 80 
baud:7812
Boot program returned did not equal boot program downloaded
------------------
Can't read chip because boot program is not running properly 
------------------

Code:
-BootSerial routine-(Called from LoadBoot)
Using Boot Program Modular BootLoader for MP Tune - BootMainAll
total bytes returned on switch-on were 1 at 11:01:58.2929151
return byte 1: 10
boot download routine is started.
boot baudrate = 7812
hi speed rate = 62500
sent FF byte
total bytes returned after sending 0xff were 1
return byte 1: FF
sending boot program. length = 256
Boot send start time 11:02:00.3084757
Boot send finish time 11:02:00.5349675
Boot reread finish time 11:02:00.6287125
done sending boot program.  bytes returned = 255
read timeout set to 1640
bytes returned were:
FF 8E 00 FF CE 10 00 CC 01 0C A7 2B E7 2D 0F CC 60 01 A7 3C E7 3F 8D 1F 17 8D 1C DD EE 8F 8D 17 17 8D 14 E7 00 F6 10 2E 2A FB E6 00 F7 10 2F 08 4A 26 EE DE EE 6E 00 36 FC 10 2E 85 20 27 F9 32 39 00 00 00 00 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
baud:7812
Boot program returned did not equal boot program downloaded
------------------
Can't read chip because boot program is not running properly
------------------

I understand, the Serial Com seems to be messed up. I added a 1K OHM pulldown resistor on both TX and RX. Still worked fine on the 1995 SBEC, but not on the 1993 SBEC. My Battery delivers 13 Volts.

Any ideas?

Greetings from Germany