P0A

P0A

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.

RAM

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|4-95 OBD1 Accord EX

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

Attachment:	Modify:	Size:	Date:	Who:	Comment:
P0A_A51.JPG	mod	442912	18 Feb 2004 - 02:24	Speedz