satan_srv

People keep asking for these so I am posting them and FAQ this. This is courtesy of Todd Marcucci and William Howell of the North Texas Prelude Owners Group and some info added from me. If you find anything incorrect let me know.

Note: Added Auto ECU info

OBDI 93-95 H22a

Layout
A1->A25--B1->B15--Blank--D1->D21
A2->A26--B2->B16--Blank--D2->D22


Pin---Color---------Desc.
A1----brn-----------Injector #1
A2----yel-----------Injector #4
A3----red1---------Injector #2
A4----grn/yel------VTEC Solenoid Valve
A5----blu-----------Injector #3
A6----or/wht-------HO2S heater coil
A7----grn/blk1-----PGM-FI Main Relay coil
A8----grn/blk2-----Shorted to A7
A9----blk/blu-------IAC Valve
A10
A11----red2--------EGR Control Solenoid
A12----blu/red-----Condenser Fan Relay
A13----blu/wht-----MIL
A14
A15----red/blu-----A/C Clutch Relay
A16----wht/grn-----Alternator
A17----pink---------IAB Solenoid Valve
A18----orn/red-----FAS (A/T)
A19----wht----------Intake Control Solenoid Valve
A20----red/grn-----EVAP Purge Control Solenoid
A21----yel/grn1----ICM
A22----yel/grn2----Shorted to A21
A23----blk1---------GND
A24----blk2---------GND
A25----yel/blk------PGM-FI Main Relay (power)
A26----blk/red------VTEC Pressure Switch (GND)

B1----yel/blk--------PGM-FI Main Relay (power)
B2----brn/blk-------GND
B3----orn1----------AFSA (A/T)
B4----pnk-----------AFSB (A/T)
B5----blu/blk--------To A/C Switch
B6
B7----lt grn---------ATP PN Gear Posisiton (A/T)
B8----red/grn-------PSP Switch
B9----blu/red-------Starter Cut Relay
B10---orn2----------VSS
B11---orn3----------CYP
B12---wht-----------CYP
B13---orn/blu-------TDC
B14---wht/blu-------TDC
B15---blu/grn-------CKP
B16--blu/yel--------CKP

D1----wht/yel-------Battery
D2----grn/wht1-----Brake Switch
D3----red/blu-------KS
D4----brn/wht------SCS
D5
D6----lt blu or lt grn-VTEC Pressure Switch
D7----lt grn/red----Data Link Connector
D8
D9----wht/red------ALT
D10---grn/blk------ELD
D11--red/blk-------TP Sensor
D12---wht/blk------EGR Valve Lift Sensor
D13---yel/blu-------ECT Sensor
D14---wht----------HO2S Sense
D15---red/yel------IAT Sensor
D16
D17---wht/blu------MAP Sensor
D18---lt grn/blk----VREF (A/T)
D19---red/wht------EGR Valve Lift Sensor
D20---yel/wht------TP Sensor
D21---blu/wht------MAP Sensor
D22---grn/wht2----TP Sensor


OBDII H22a 96+

Layout
A1->A11----Blank--C1->C10---D1->D5
A12->A24--Blank--C11->C22--D6->D12
A25->A32--Blank--C23->C31--D13->D16

Pin---Color ---------Desc.
A1----yel------------Injector #4
A2----blu------------Injector #3
A3----red------------Injector #2
A4----brn------------Injector #1
A5----orn/blu-------Secondary O2 heater
A6----blk/wht-------HO2S heater
A7----orn------------EGR Control Solenoid Valve
A8----grn/yel-------VTEC Solenoid Valve
A9----brn/blk-------GND (dig)
A10---blk------------GND (power)
A11---yel/blk-------PGM-FI Power
A12---blk/blu-------Idle Air Control Valve
A13
A14
A15---red/yel-------Evap Purge Control Solenoid Valve
A16---grn/orn-------Fuel Pump Relay
A17---pnk/blu-------A/C Clutch Relay
A18---gry/red-------MIL
A19---wht/grn-------ALT
A20---yel/grn--------ICM
A21
A22---brn/blk--------GND (dig)
A23---blk------------GND (power)
A24---yel/blk--------PGM-FI Power
A25---wht-----------Intake Control Solenoid Valve
A26---red/blu-------IAB Control Solenoid Valve
A27---grn-----------Radiator Fan Relay
A28---grn/wht------EVAP Bypass Solenoid Valve
A29---orn/grn------Evap control cansiter vent shut valve
A30
A31-
A32-

C1---lt grn/blk------Ref. Voltage for ATTS or TCM (not used)
C2---blu------------CKP Detect
C3---grn------------TDCP Detect
C4---yel------------CKP Detect
C5---blu/orn-------A/C Switch Signal Input
C6---blu/red-------Starter Switch Input
C7---red/wht-------SCS
C8---lt grn ---------K Line (scan tool)
C9-- -
C10---wht/yel------ECM Backup Power
C11-- -
C12---wht----------CKP GND
C13---red----------TDC M Side
C14---blk----------CYP M Side
C15---blu/blk------VTEC Pressure Switch
C16---grn----------P/S Pressure Switch
C17---wht/grn-----ALT Detect signal
C18---blu/wht------VSS Signal
C19 -
C20 - -
C21 - -
C22---brn/yel------IMO Immobilizer Code Signal
C23- -
C24 - -
C25 - -
C26 - -
C27 - -
C28 - -
C29 - -
C30 - -
C31 - -

D1----red/blk----------TPS Detect
D2----red/wht---------ECT Engine Coolant Temp. Detect
D3----red/grn---------MAP Detect
D4----yel/red----------Vcc1 (Power for MAP)
D5----wht/blk----------BKSW Brake Switch Detect
D6----red/blu----------KS (Knock Sensor Detect)
D7----wht--------------HO2S Detect
D8----red/yel----------IAT Intake Air Temp Detect
D9----wht/blk----------EGR Valve Lift Sensor
D10---yel/blu----------Vcc2 (Provides Sensor Voltage)
D11---grn/blk----------SG2 (Sensor Ground)
D12---grn/wht---------SG1 (Sensor Ground)
D13- -
D14---wht/red---------SHO2S (Secondary O2 Sensor Detect)
D15---wht/blu---------PTANK (Detects fuel tank pressure signal)
D16---grn/red---------EL (Detects ELD Signal)

Note: some of the pins listed for OBDII don't apply to te 96 and were only added in 97 but the layout is the same.

sharkcohen

Where can we get pinouts for the USDM auto p13? The auto lude OBDII ecu doesn't have a seperate plug for the wires involved with the tranny computer, there are only 2 wires that run between them and these wires are in the existing plugs. I need to know if this is the same for the OBDI p13. Anyone here have a 4th gen Helm manual???

spnbb2

sweet info

satan_srv

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sharkcohen &raquo;</TD></TR><TR><TD CLASS="quote">Where can we get pinouts for the USDM auto p13? The auto lude OBDII ecu doesn't have a seperate plug for the wires involved with the tranny computer, there are only 2 wires that run between them and these wires are in the existing plugs. I need to know if this is the same for the OBDI p13. Anyone here have a 4th gen Helm manual???</TD></TR></TABLE>

You're right, I was thinking of the ludes with 4ws or traction control...they use another plug

Added A/T connections above in A18, B3, B4, B7 and D18. B7 gets input from the gear selector in the car, the other 4 go directly to the TCM

sharkcohen

Interesting. Thanks Satan!!!

alphajesse

Joel, could you give me the full description and troubleshooting info for pins A18, B3, B4, B7 and D18 in the 4th gen helms?

StuntMonkeh

Thanks for the info, this should come in handy.

Silverpike

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by alphajesse &raquo;</TD></TR><TR><TD CLASS="quote">Joel, could you give me the full description and troubleshooting info for pins A18, B3, B4, B7 and D18 in the 4th gen helms?</TD></TR></TABLE>
Jesse, I have a PDF copy of the 4th gen Helms I can give you.

LudeyKrus

Um, I coulda swore that I needed this a few weeks ago for a VAFC install, and I found it in the "Prelude FAQ/INFO" post!

Oh well, not complainin.

Also, Silverpike, I'd like a copy of that PDF if you don't mind; I have the paper copy of the Helm's, but having something on my laptop would be nice sometimes.

CHK4TIX

Here is a graphic i made of the ODB1 ecu connectors, to give you a visual as well.

if you want to see the full size view, just open in a new window and put .orig.jpg after it. Or i can email it to you if needed

TypeRKoncepts

i've seen jdm p13's with 2w and 4w on them... and i have an extra set of pins i don't use. I think mine came from a 4ws trim lude. U guys know anything about those eecu's? the only CEL i keep getting is the 4ws one and its annoying as fawk.

popRAWvtec

what about the euro accord type-R ecu pinout? is it same as the other h22 obd2 ecu's

Katman

anyone have the pinout diagram for an AUTO JDM OBD1 P13 ecu with 4-plugs?

4th plug is for the TCU, auto tranny related.

R.a.w.

nice

MackDad

satan_srv, or someone else, maybe you can help me....I've got a JDM H22A 5MT M2B4, and I'm throwing a code 36....I am still trying to figure out what it is...I've heard that it is Traction Control, and I've heard it's the code for 4WS....If it is traction control, how would I go about hooking it up? Through the ABS unit? Any help would be appreciated....Also, would you happen to know the pinout for the FPR solenoid, you know, that stupid little solenoid between the IM and the FPR? Thanks

pentaq

B9----blu/red-------Starter Cut Relay

What does it do? Is it a good pin to hook up for power for piggyback computer or better stick with A25 (OBD1 H22)
Thanks

MackDad

Bump...

Entaka

Bump Awesome info

specialedition

great info saved me several times and I just saved my tps thanks to this

Entaka

I assume this is for a manual prelude? My JDM auto ECU has one more pin out section. (4 instead of 3) Maybe Im just confused...ill post a pic of my ecu later.

92hondalude

i have the 2 conectors for the vtec solinoid and the vtec oil presure but i dont have the pins out for the ecu. where can i get these and what do they look like?
thanks,
Nick Burden

greyw0lf

could someone email me a bigger picture of the 92-95 obd1 ecu pinout and diagrams?? my email is ihuysteri@gmail.com

VtecFreePrelude

what about the acord euro-r wagon ecu stuff
it's an obdII h23.
gonna need that stuff soon

Demonlude

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by greyw0lf &raquo;</TD></TR><TR><TD CLASS="quote">could someone email me a bigger picture of the 92-95 obd1 ecu pinout and diagrams?? my email is ihuysteri@gmail.com</TD></TR></TABLE>

All you need to do is right click on the picture, then select properties. Copy the URL that it shows in the properties, and paste it into a new browser window. At the end of the URL, you will also need to type .orig.jpg to see the big picture.

greyw0lf

i tried doin that but it doesnt work.