So, Im going to put this harness together and I have what i think is the definitive
guide to matching up wires. Well, Ive run into a snag. Several charts have
different locations for different wires. I have a few pictures. If anyone could tell
me FOR SURE which pin out is right.

this looks like a perfect diagram to me but according to this and the table shown
below (which was sent to me by a reputable source) i am missing wires in my
obd1 plugs.


OBD 2 Ver. 2 OBD 1 Terminal Description
B11 A1 #1 injector
B3 A3 #2 injector
B4 A5 #3 injector
B5 A2 #4 injector
B1 A25 IGN power 1 for ECU
B9 B1 IGN power 2 for ECU
B2 A23 Power ground 1 for ECU
B10 A24 Power Ground 2 for ECU
B20 A26 Logic Ground 1 for ECU
B22 B2 Logic ground 2 for ECU
A6 A20 EVAP Purge control solenoid valve
A29 - Fuel tank pressure sensor
B12 A4 VTEC solenoid
- - Fuel pressure solenoid valve
A16 A7 Fuel pump relay
- - Fuel pump relay
A18 A13 Malfunction indicator lamp
B13 A21
- - Igniter
B23 A9 IACV (EACV)
C16 D14 Primary O2 signal
C1 A6 Primary HO2 heater control
A23 - Secondary O2 signal
A8 - Secondary HO2 heater control
- A17 IAB (GSR)
A20 A12 Radiator fan control
- - Tandem valve control solenoid
C22 - CKF P
C31 - CKF G
C8 B15 CKP P
C9 B16 CKP G
C20 B13 TDC P
C21 B14 TDC G
C29 B11 CYP P
C30 B12 CYP G
A17 A15 A/C clutch relay
A27 B5 A/C switch
A24 B9 Starter switch signal
A10 D4 Service check signal (Ignition timing adjusting connector)
A21 - K-Line
B21 D1 DTC memory voltage
C10 D6 VTEC oil pressure
A26 B8 Power steering pressure switch
A32 D2 Brake switch signal
C5 D9 Alternator FR signal
C2 A16 Alternator control
C26 D13 ECT
A30 D10 ELD
C25 D15 IAT
- - PA
C27 D11 TPS
C23 B10 VSS
C28 D20 Sensor voltage
C18 D22 Sensor ground
C17 D17 MAP
C19 D19 Map sensor voltage
C7 D21 MAP sensor ground
C3 D3 Knock sensor

About counting pins. The way I WAS counting them was (this is in the ecu socket)
from top left to bottom right. Starting with the pin in the upper left corner and
working my way right in the first row. When i got to the end of THAT row i moved
to the far left of the second row and followed the same procedure and so on and
so forth untill finishing that particular plug. Well take a look at this picture...


You can plainly see that the pins are numbered a different way. Is this true on the
obd1 ecu's?

Ill have to check the Exact location of pins missing from my harnesses and what
was left over after i was done with the first plug. I know off the top of my head,
according to the first picture i posted, that I had no wire in socket a23 and a24 of
the harness I was sent. Is this indicative of a certain model car?

BTW/FYI Im working on an OBD1/OBD2(.5) harness for my 00 DX