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94-95 OBD1 Accord EX

attached pic is a 94 P0A-A51
PCB is IPT 02D010B0-1502

The data below has been copied over from the P13 page as a place holder. Only a few of the locations are actually known at this time.

Added/Hijacked by @Spudz76 : Attached a verified dump of "F4" version ROM. It does not appear the 66911 has any internal ROM? I have used dasm662 and/or doc's 66k disasm (not sure which produces more valid disassembly - heard both will misunderstand some instructions due to no actual MSM66911 docs, and will be beginning to map (fill in this P13 copy with valid/checked refs). dasm662's data table detection seems to work rather well, viewing the data 'looks' correct although the map sizes are "strange" and I don't know the conversions/scalars (or even if this uses them like the civic stuff).

Functions

Location Action
label_0ff2 some reset function, initializes RAM locations

RAM

Valid locations, functions TBD
Location Bytes Description Notes
off(00218h).0 bit ? default 1
0d6h 1 ? default 00
0d7h 1 ? default 00
(to be found...)
Location Bytes Description Notes
1 MAP sensor
1 Tps Sensor OBD1_8bit TPS
2 RPM in 16bit form
1 ECT Sensor ??
1 VSS Sensor km/h
1 Column of table See ROM @6050 - mBar scale
1 Row of low cam table See ROM @6000 - low cam RPM scale
1 Row of high cam table See ROM @6028 - high cam RPM scale
2 CEL Word #1 contains 0x0000 otherwise a bit depending on CEL
2 CEL Word #2 contains 0x0000 otherwise a bit depending on CEL
2 CEL Word #3 contains 0x0000 otherwise a bit depending on CEL
2 CEL Word #4 contains 0x0000 otherwise a bit depending on CEL
2 Actual Rev Cut OBD1_16bit RPM
2 Actual Rev Resume OBD1_16bit RPM
1 Current RPM in 8bit form  
1b VTEC Active ??
1b A/C Switch Input If pin B5 (ACS) is grounded, 0x0224.0 will read 1
1 RPM in 8bit form  
1 O2 sensor ???
1 IAT sensor 0v-5v 0x00-0xFF
1 Baro Sensor 0v-5v 0x00-0xFF
1 ECT sensor 0v-5v 0x00-0xFF

ROM

Location Bytes Description Notes
0C90 4 Checksum Jump Instruction Change 909DF17F->03A40C00 to disable checksum
2 High Cam Rev Limit Reset Moved to memory here as well as the later entries
2 High Cam Rev Limit Set Moved to memory here as well as the later entries
1 Speed Limiter 0-255km/h (0-159MPH) FF disables speed limiter
1 VTEC Coolant Temp Check (0x44 enables, 0xFF disables)
2 Low Cam Rev Limit Reset OBD1_16bit RPM format
2 Low Cam Rev Limit Set OBD1_16bit RPM format
2 High Cam Rev Limit Reset OBD1_16bit RPM format
2 High Cam Rev Limit Set OBD1_16bit RPM format
6000 40 Low Cam Rev Scalar 1x40 Each scalar is in OBD1_16bit RPM format
6028 40 High Cam Rev Scalar 1x40 Each scalar is in OBD1_16bit RPM format
6050 10 Low and High Cam Map Scalar 1x10 [OBD1_8bitMBar]
605A 40 A scalar? Or Multiplier? 1x40 16bit format
6082 40 A scalar? Or Multiplier? 1x40 16bit format
60AA 200 Low Cam Fuel Table Unknown Conversion Formula
6172 200 High Cam Fuel Table Unknown Conversion Formula
623A 110 Extra Table - no idea, simular to maps @6316 & 6384 10 col x 11 row
62A8 110 Extra Table - no idea, simular to maps @6316 & 6384 10 col x 11 row
6316 110 Extra Table - no idea, all 80s 10 col x 11 row
6384 110 Extra Table - no idea, all 80s 10 col x 11 row
63F8 200 Low Cam Ignition Table OBD1_8bit Advance
64C0 100 Extra Low Cam Ignition Table 10 col x 10 row
642E 100 Extra Low Cam Ignition Table 10 col x 10 row
659C 200 High Cam Ignition Table OBD1_8bit Advance
6664 100 Extra High Cam Ignition Table 10 col x 10 row
66D2 100 Extra High Cam Ignition Table 10 col x 10 row
681C 110 Extra Table - no idea, all 00s 10 col x 11 row
688A 120 Extra Table - no idea, all 00s 10 col x 12 row
7FF1 1 Debug/Test mode???? 0xFF enables, 0x00 disables???? here

Attachment?: Modify: Size: Date: Who: Comment:
P0A_A51.JPG mod 442912 18 Feb 2004 - 02:24 Speedz  
p0a-a51-f4-orig.bin mod 32768 10 Mar 2014 - 07:17 spudz76 Dump of M38256AP-F4 (from 95 P0A-A51 box)

Revision: r1.5 - 12 Mar 2014 - 09:10 GMT - spudz76 { Edit | Attach | History | More }
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