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Obd1 few pin questions

6.8K views 12 replies 4 participants last post by  joshcarz  
#1 ·
Im almost done making my obd0 to obd1 conversion harness and i have a few questions about a few pins. I cant find any more info for them other than what i already have. Here are the pins just wondering what they do.

D7 TXD/RXD data link connector (maybe somthing for the o2?)
A17 Secondary Intake Solenoid (Does my D series vtec even have this?)
D16 VREF/VREF (I'm lost on this one. I have no idea. My obd1 harness didnt even have a wire coming out of this slot though.)

If anyone knows or could help, it'll be greatly appreciated. All the info i found while searching shows just what i typed above.
 
#2 ·
When I made mine I used this.

OBD-0 - OBD-1
A01 ---INJ #1 --> A01 - INJ #1
A02 --- PG1 --> A23 - PG1
A03 - INJ #2 --> A03 - INJ #2
A04 - PG2 --> A24 - PG2
A05 - INJ #3 --> A05 - INJ #3
A06 - PCS --> A20 - PCS
A07 - INJ #4 --> A02 - INJ #4
A08 - LOCKSOL --> XXXXXXXXXXX
A09 - NOTUSED--> XXXXXXXXXXXX
A10 - EGR CSV--> A11
A11 - IACV --> A09 - IACV
A12 - FLR1 --> A07 - FLR1
A13 - IGP1 --> A25 - IGP1
A14 - FLR2 --> A08 - FLR2
A15 - IGP2 --> B01 - IGP2
A16 - GRD --> A26 - LG1
A17 - NOTUSED--> XXXXXXXXXXXX
A18 - GRD --> B02 - LG2
B01 - VBP --> D01 - VBU
B02 - NOTUSED--> XXXXXXXXXXXX
B03 - ACC --> A15 - ACC
B04 - FANC --> A12 - FANC
B05 - ALT --> A16 - ALT
B06 - MIL --> A13 - MIL
B07 - NOTUSED--> XXXXXXXXXXXX
B08 - ACS --> B05 - ACS
B09 - NOTUSED--> XXXXXXXXXXXX
B10 - CYP P --> B11 - CYP P
B11 - FUSEBOX--> xxxxxxxxxxxx
B12 - CYP M --> B12 - CYP M
B13 - FUSEBOX--> B09 - STARTER
B14 - ALT --> D09 - ALT
B15 - Igniti --> A21 - ICM
B16 - VSS --> B10 - VSS
B17 - Igniti --> A22 - ICM
B18 - NOTUSED--> XXXXXXXXXXXX
B19 - ELD --> D10 - ELD
B20 - SCS --> D04 - SCS
C01 - CKP P --> B15 - CKP P
C02 - CKP M --> B16 - CKP M
C03 - TDC P --> B13 - TDC P
C04 - TDC M --> B14 - TDC M
C05 - IAT --> D15 - IAT
C06 - ECT --> D13 - ECT
C07 - TPS --> D11 - TPS
C08 - EGR VLS--> D12
C09 - PA --> NOTUSEDXXXXX
C10 - BKSW --> D02 - BKSW
C11 - MILGRND--> D17 - MAP
C12 - SG2 --> D22 - SG2
C13 - VCC1 --> D19 - VCC1
C14 - SG1 --> D21 - SG1
C15 - VCC2 --> D20 - VCC2
C16 - O2S --> D14 - PHO2S

There were a few extra wires that were left over that are not used on both sides and everything still worked fine.

This also helped

Image
 
#3 ·
thats cool. I have somthing almost like that. Ill check mine with that to see if its the same. Ill paste what i used when i get home. I was really just wondering what those things meant and did just out of curiosity.
 
#9 ·
The credit for the pin-out goes to dr_latino999 and TURBOGIXXER of H-T. :TU:

When I did mine I found about 5 different write-ups. I got actual diagrams and started checking... I wanted to be absolutely sure before I cut the ECU plugs off my car that it was going to work. The diagram I posted helped a lot with the engine harness and making sure everything was correct in the end.

Your jumper harness looks good. :TU:
 
#10 ·
thanks. i learned alot. thats why i like doing everything myself instead of buying one off ebay. plus i had all the parts i needed. why not go ahead and try.

real quick i heard somthing about more than just hondas use the same 4 wire 02 sensor. or at least different cars 02 sensors work. is this true?