Stock Chip Serial # for Bosch ECU 0 261 200 473?
04-27-2010, 11:52 PM
#1
Rennlist Member
Thread Starter
Stock Chip Serial # for Bosch ECU 0 261 200 473?
What Stock Chip Serial # Range should I be looking for? Bosch
ECU 0 261 200 473 (94' C2)
Thanks,
JF
ECU 0 261 200 473 (94' C2)
Thanks,
JF
04-28-2010, 12:29 AM
#2
Addict
Rennlist Member
Rennlist Member
Joseph,
Kinda' cutting it close. Race is only a few weeks away.
Good question. Some of the chips are interchangeable but the majority are not. It also looks like you can use a couple of different stock chips with your particular ECU. You may want to post your search here--lots of folks have switched to an aftermarket item. You can also use a Steve Wong or other aftermarket chip since you're running Prepared H, right?
Kinda' cutting it close. Race is only a few weeks away.
Good question. Some of the chips are interchangeable but the majority are not. It also looks like you can use a couple of different stock chips with your particular ECU. You may want to post your search here--lots of folks have switched to an aftermarket item. You can also use a Steve Wong or other aftermarket chip since you're running Prepared H, right?
04-28-2010, 03:22 AM
#3
Rennlist Member
Thread Starter
Joey:
Thanks, that's the info I was looking for, this is for my 94' Cab that I'm returning to stock from an Autothority MAF. Is the "Chksum" relevant? If so where can I find it for my ecu?
I have a Steve Weiner-Rennsport Systems 100 octane race gas chip for the race car.
JF
Thanks, that's the info I was looking for, this is for my 94' Cab that I'm returning to stock from an Autothority MAF. Is the "Chksum" relevant? If so where can I find it for my ecu?
I have a Steve Weiner-Rennsport Systems 100 octane race gas chip for the race car.
JF
04-28-2010, 09:00 AM
#4
Addict
Rennlist Member
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Ah yes, you have two 964's. Sounds like you've got the race car covered. Have you raced the 964, yet? Last time I saw you at Gingerman, I think you were still campaigning a water-cooled example.
As for the "Chksum," I'm not sure what that is and whether it makes a difference. Anyone?
As for the "Chksum," I'm not sure what that is and whether it makes a difference. Anyone?
04-28-2010, 01:06 PM
#5
RL Technical Advisor
The Checksum is only relevant to a person making a chip and you cannot find it without an EPROM burner.
Its a way for us to ensure that the chip will start the car,...
Its a way for us to ensure that the chip will start the car,...
04-28-2010, 04:31 PM
#6
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In computer programming generally, a checksum is one simple means of ensuring that the data was probably not garbled during the chip making process or later. A simple checksum is literally the sum of all the data bytes. You add them up and ignore overflow, just let it wrap around. If that number matches one that was stored during programming, then the odds are pretty high that nothing changed. We could checksum this paragraph of text by adding up all the letters' ASCII value (each letter has a numeric value), and if it matches, then Rennlist did not lose data on its server, nor in transmission over the internet.
04-28-2010, 08:38 PM
#7
Technical Guru
Rennlist Member
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Code:
; Calculate EPROM Checksum 0x0000 - 0x7EFE
MEM_EXT:40AF
MEM_EXT:40AF CALCULATE_CHECKSUM:
MEM_EXT:40AF mov P2, #0xF4 ; '('
MEM_EXT:40B2 movx A, @R0 ; F400
MEM_EXT:40B3 xrl A, #1001111b
MEM_EXT:40B5 mov RAM_20, A
MEM_EXT:40B7 jb SWITCH_DEBUG, @@5 ; RAM_20.3
MEM_EXT:40B7
MEM_EXT:40BA mov P2, #0x7E ; '~'
MEM_EXT:40BD mov R0, ERROR_SYSTEM ; 7EB8
MEM_EXT:40BF movx A, @R0
MEM_EXT:40C0 jb ACC.7, @@5
MEM_EXT:40C0
MEM_EXT:40C3 mov R3, #0
MEM_EXT:40C5 mov R2, #0x7F ; ''
MEM_EXT:40C7 mov DPTR, #0 ; Calculate Checksum
MEM_EXT:40CA clr A
MEM_EXT:40CB mov R0, A
MEM_EXT:40CC mov R1, A
MEM_EXT:40CD
MEM_EXT:40CD @@1:
MEM_EXT:40CD
MEM_EXT:40CD clr A
MEM_EXT:40CE movc A, @A+DPTR
MEM_EXT:40CF add A, R0
MEM_EXT:40D0 mov R0, A
MEM_EXT:40D1 jnc @@2
MEM_EXT:40D1
MEM_EXT:40D3 inc R1
MEM_EXT:40D4
MEM_EXT:40D4 @@2:
MEM_EXT:40D4 inc DPTR
MEM_EXT:40D5 jb TCON.1, @@5
MEM_EXT:40D5
MEM_EXT:40D8 mov A, DPH
MEM_EXT:40DA cjne A, RAM_2, @@1
MEM_EXT:40DA
MEM_EXT:40DD mov RAM_6F, #0x46 ; 'F'
MEM_EXT:40E0 mov A, DPL
MEM_EXT:40E2 cjne A, RAM_3, @@1
MEM_EXT:40E2
MEM_EXT:40E5 clr A
MEM_EXT:40E6 movc A, @A+DPTR
MEM_EXT:40E7 clr C
MEM_EXT:40E8 subb A, R1
MEM_EXT:40E9 jnz @@3
MEM_EXT:40E9
MEM_EXT:40EB inc DPTR
MEM_EXT:40EC movc A, @A+DPTR
MEM_EXT:40ED clr C
MEM_EXT:40EE subb A, R0
MEM_EXT:40EF jnz @@3
MEM_EXT:40EF
MEM_EXT:40F1 clr PSW.5
MEM_EXT:40F3 sjmp @@4
MEM_EXT:40F3
MEM_EXT:40F5 ; ---------------------------------------------------------------------------
MEM_EXT:40F5
MEM_EXT:40F5 @@3:
MEM_EXT:40F5
MEM_EXT:40F5 setb PSW.5
MEM_EXT:40F7
MEM_EXT:40F7 @@4:
MEM_EXT:40F7 mov R0, ERROR_SYSTEM
MEM_EXT:40F9 movx A, @R0 ; 7EB8
MEM_EXT:40FA setb ACC.7
MEM_EXT:40FC movx @R0, A
MEM_EXT:40FD mov DPTR, #RAM_EXT_6266
MEM_EXT:4100 mov A, #63
MEM_EXT:4102 mov RAM_RPM_VALUE, A
MEM_EXT:4104 movc A, @A+DPTR ; 62A5 = Fault Code 41 Control unit faulty
MEM_EXT:4105 mov B, A
MEM_EXT:4107 mov R2, #4
MEM_EXT:4109 clr A
MEM_EXT:410A mov R6, A
MEM_EXT:410B mov R7, A
MEM_EXT:410C mov C, PSW.5
MEM_EXT:410E lcall STORE_FAULT_CODE
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04-28-2010, 09:43 PM
#8
Nordschleife Master
Code:
; Calculate EPROM Checksum 0x0000 - 0x7EFE
MEM_EXT:40AF
MEM_EXT:40AF CALCULATE_CHECKSUM:
MEM_EXT:40AF mov P2, #0xF4 ; '('
MEM_EXT:40B2 movx A, @R0 ; F400
MEM_EXT:40B3 xrl A, #1001111b
MEM_EXT:40B5 mov RAM_20, A
MEM_EXT:40B7 jb SWITCH_DEBUG, @@5 ; RAM_20.3
MEM_EXT:40B7
MEM_EXT:40BA mov P2, #0x7E ; '~'
MEM_EXT:40BD mov R0, ERROR_SYSTEM ; 7EB8
MEM_EXT:40BF movx A, @R0
MEM_EXT:40C0 jb ACC.7, @@5
MEM_EXT:40C0
MEM_EXT:40C3 mov R3, #0
MEM_EXT:40C5 mov R2, #0x7F ; ''
MEM_EXT:40C7 mov DPTR, #0 ; Calculate Checksum
MEM_EXT:40CA clr A
MEM_EXT:40CB mov R0, A
MEM_EXT:40CC mov R1, A
MEM_EXT:40CD
MEM_EXT:40CD @@1:
MEM_EXT:40CD
MEM_EXT:40CD clr A
MEM_EXT:40CE movc A, @A+DPTR
MEM_EXT:40CF add A, R0
MEM_EXT:40D0 mov R0, A
MEM_EXT:40D1 jnc @@2
MEM_EXT:40D1
MEM_EXT:40D3 inc R1
MEM_EXT:40D4
MEM_EXT:40D4 @@2:
MEM_EXT:40D4 inc DPTR
MEM_EXT:40D5 jb TCON.1, @@5
MEM_EXT:40D5
MEM_EXT:40D8 mov A, DPH
MEM_EXT:40DA cjne A, RAM_2, @@1
MEM_EXT:40DA
MEM_EXT:40DD mov RAM_6F, #0x46 ; 'F'
MEM_EXT:40E0 mov A, DPL
MEM_EXT:40E2 cjne A, RAM_3, @@1
MEM_EXT:40E2
MEM_EXT:40E5 clr A
MEM_EXT:40E6 movc A, @A+DPTR
MEM_EXT:40E7 clr C
MEM_EXT:40E8 subb A, R1
MEM_EXT:40E9 jnz @@3
MEM_EXT:40E9
MEM_EXT:40EB inc DPTR
MEM_EXT:40EC movc A, @A+DPTR
MEM_EXT:40ED clr C
MEM_EXT:40EE subb A, R0
MEM_EXT:40EF jnz @@3
MEM_EXT:40EF
MEM_EXT:40F1 clr PSW.5
MEM_EXT:40F3 sjmp @@4
MEM_EXT:40F3
MEM_EXT:40F5 ; ---------------------------------------------------------------------------
MEM_EXT:40F5
MEM_EXT:40F5 @@3:
MEM_EXT:40F5
MEM_EXT:40F5 setb PSW.5
MEM_EXT:40F7
MEM_EXT:40F7 @@4:
MEM_EXT:40F7 mov R0, ERROR_SYSTEM
MEM_EXT:40F9 movx A, @R0 ; 7EB8
MEM_EXT:40FA setb ACC.7
MEM_EXT:40FC movx @R0, A
MEM_EXT:40FD mov DPTR, #RAM_EXT_6266
MEM_EXT:4100 mov A, #63
MEM_EXT:4102 mov RAM_RPM_VALUE, A
MEM_EXT:4104 movc A, @A+DPTR ; 62A5 = Fault Code 41 Control unit faulty
MEM_EXT:4105 mov B, A
MEM_EXT:4107 mov R2, #4
MEM_EXT:4109 clr A
MEM_EXT:410A mov R6, A
MEM_EXT:410B mov R7, A
MEM_EXT:410C mov C, PSW.5
MEM_EXT:410E lcall STORE_FAULT_CODE
04-29-2010, 12:01 AM
#9
"Its a way for us to ensure that the chip will start the car,"
Actually, the engine will start with an incorrect checksum, but will produce
a fault code in the DME:
movc A, @A+DPTR ; 62A5 = Fault Code 41 Control unit faulty
and then;
lcall STORE_FAULT_CODE
Actually, the engine will start with an incorrect checksum, but will produce
a fault code in the DME:
movc A, @A+DPTR ; 62A5 = Fault Code 41 Control unit faulty
and then;
lcall STORE_FAULT_CODE
