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P13

93-95 OBD1 Prelude Vtec (H22A DOHC Vtec)

RAM

Location Bytes Description Notes
00A4 1 MAP sensor
00AB 1 Tps Sensor OBD1_8bit TPS
00AE 2 RPM in 16bit form
00D9 1 ECT Sensor ??
00DF 1 VSS Sensor km/h
00ED 1 Column of table See ROM @6050 - mBar scale
00EE 1 Row of low cam table See ROM @6000 - low cam RPM scale
00EF 1 Row of high cam table See ROM @6028 - high cam RPM scale
0110 2 CEL Word #1 contains 0x0000 otherwise a bit depending on CEL
0111 2 CEL Word #2 contains 0x0000 otherwise a bit depending on CEL
0113 2 CEL Word #3 contains 0x0000 otherwise a bit depending on CEL
0114 2 CEL Word #4 contains 0x0000 otherwise a bit depending on CEL
016A 2 Actual Rev Cut OBD1_16bit RPM
016C 2 Actual Rev Resume OBD1_16bit RPM
0179 1 Current RPM in 8bit form  
021D.1 1b VTEC Active ??
0224.0 1b A/C Switch Input If pin B5 (ACS) is grounded, 0x0224.0 will read 1
0289 1 RPM in 8bit form  
03D0 1 O2 sensor ???
03D2 1 IAT sensor 0v-5v 0x00-0xFF
03D3 1 Baro Sensor 0v-5v 0x00-0xFF
03DA 1 ECT sensor 0v-5v 0x00-0xFF

ROM

Location Bytes Description Notes
0D22 4 Checksum Jump Instruction Change 909DF17F->03360D00 to disable checksum
0C21 2 High Cam Rev Limit Reset Moved to memory here as well as the later entries
0C26 2 High Cam Rev Limit Set Moved to memory here as well as the later entries
2EAC 1 Speed Limiter 0-255km/h (0-159MPH) FF disables speed limiter
35CA 1 VTEC Coolant Temp Check (0x44 enables, 0xFF disables)
5403 2 Low Cam Rev Limit Reset OBD1_16bit RPM format
5407 2 Low Cam Rev Limit Set OBD1_16bit RPM format
540B 2 High Cam Rev Limit Reset OBD1_16bit RPM format
540F 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

Datalogging:

0043h - Interrupt Start Which jumps to either 004bh or 00dbh... When writing your datalogging code put your code at 000dbh as that's the main section that's called... or use the vector pointer at 0020h to specify a new interrupt location...

SRBUF: 07dh STBUF: 07ch

Checksum:

Disable checksum @ 0D22 909DF17F->03360D00

Memory Locations: Here's a few memory locations for use with Boost or 2-step code to get you all started...

0aeh is 16bit RPM 0179h and 0289h is 8bit RPM (For use with VTEC) 0a4h is the map sensor 0dfh is the VSS

Extra tidbits...

Map sensor check @ 1f57h for use with Boost

CEL Stuff @ 1a4bh for MIL Shiftlight

Rev limit set locations @ 157dh for 2-step

AC Stuff @ 1b4dh for AC Cut


Hardware Mods: Remove AKnock Sensor OBD1 P13 Auto Manual

Attachment?: Modify: Size: Date: Who: Comment:
P13_eprom_check.jpg mod 107471 04 Mar 2004 - 00:37 blundar Check for EPROM on P13 (thanks Katman)
P2210014.JPG mod 144657 30 Mar 2004 - 22:23 eg6ajk  
P2210023.JPG mod 747165 30 Mar 2004 - 22:24 eg6ajk  
JDM-p13-resistors.jpg mod 42442 22 May 2004 - 15:44 Artifex JDM p13 resistor area (thanks flyrod)
rpP13.jpg mod 47821 22 May 2004 - 15:47 Artifex USDM (top) vs. JDM (bottom) resistor area (flyrod)
P13.jdmus.check_1.jpg mod 243133 26 May 2004 - 15:34 Artifex JDM vs. USDM p13 visual differences
p13-jdm.JPG mod 963984 18 Sep 2004 - 00:39 Artifex JDM P13 ECU (thanks Sammy)
HondaP13J501UKJDM.jpg mod 340281 07 Dec 2005 - 13:49 cybugluder JDM P13 J50 UK 4 Plug Version
jdm_p13_auto_115.jpg mod 424867 19 Sep 2006 - 16:59 carotman JDM Auto P13 ECU
jdm_p13_manual_300.jpg mod 422194 19 Sep 2006 - 17:01 carotman JDM Manual P13 ECU
P13-900.jpg mod 1048876 19 Sep 2006 - 17:23 carotman JDM P13-900 Auto ECU
P13-900_injector.jpg mod 1069955 19 Sep 2006 - 17:25 carotman JDM P13-900 Injector test Circuit
P13-900_jumpers.jpg mod 1064324 19 Sep 2006 - 17:27 carotman JDM P13-900 Auto Jumpers (RP11 and RP12)

Revision: r1.15 - 19 Sep 2006 - 17:13 GMT - carotman { Edit | Attach | History | More }
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