Cars · Electronics
P0A
P0A 9495 OBD1 Accord EX attached pic is a 94 P0AA51 PCB is IPT 02D010B01502 The data below has been copied over from the P13 page as a place holder.
Adapted from pgmfi.org wiki
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 |
Credits and source
Authors Speedz, blundar, kabuki
Source Adapted from P0A on pgmfi.org wiki. Licensed under CC BY-NC-SA 1.0.