ECU Pinout

[Kyle21nluvnit]

Hey does anyone have an ECU pinout diagram for the 96 accord LX. I found it for the H22A if anyone is interested I just need the corresponding information for the accord. All help is greatly appreciated.

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.

 

[Kyle21nluvnit]

Hey people I stayed up late last night and went over both wiring diagrams and came up with the conversion for the obd1 h22a into a obd2 accord lx manual. I used the list from above and added the required accord harness pin to the right of the p13 connector pins. I only did what i needed to make it work in my car but it might help someone else.

OBDI 93-95 H22a to OBD2 96 accord lx

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

Pin---Color---------Desc.
A1----brn-----------Injector #1 / A4
A2----yel-----------Injector #4 / A1
A3----red1---------Injector #2 /A3
A4----grn/yel------VTEC Solenoid Valve /A8
A5----blu-----------Injector #3 /A2
A6----or/wht-------HO2S heater coil / A6
A7----grn/blk1-----PGM-FI Main Relay coil /A16
A8----grn/blk2-----Shorted to A7 / A16
A9----blk/blu-------IAC Valve / A12
A10
A11----red2--------EGR Control Solenoid / A7
A12----blu/red-----Condenser Fan Relay / A27
A13----blu/wht-----MIL / C7
A14
A15----red/blu-----A/C Clutch Relay / A17
A16----wht/grn-----Alternator / A19
A17----pink---------IAB Solenoid Valve
A18----orn/red-----FAS (A/T)
A19----wht----------Intake Control Solenoid Valve / A25
A20----red/grn-----EVAP Purge Control Solenoid / A15
A21----yel/grn1----ICM / A20
A22----yel/grn2----Shorted to A21 / A20
A23----blk1---------GND
A24----blk2---------GND / A22
A25----yel/blk------PGM-FI Main Relay (power) / A24
A26----blk/red------VTEC Pressure Switch (GND) / ANY OPEN SLOT
B1----yel/blk--------PGM-FI Main Relay (power) / A24
B2----brn/blk-------GND / A9-A10
B3----orn1----------AFSA (A/T)
B4----pnk-----------AFSB (A/T)
B5----blu/blk--------To A/C Switch / C5
B6
B7----lt grn---------ATP PN Gear Posisiton (A/T)
B8----red/grn-------PSP Switch / C16
B9----blu/red-------Starter Cut Relay / C6
B10---orn2----------VSS / C18
B11---orn3----------CYP / C4
B12---wht-----------CYP / C14
B13---orn/blu-------TDC / C3
B14---wht/blu-------TDC / C13
B15---blu/grn-------CKP / C2
B16--blu/yel--------CKP / C12
D1----wht/yel-------Battery / C10
D2----grn/wht1-----Brake Switch / D5
D3----red/blu-------KS
D4----brn/wht------SCS / C7
D5
D6----lt blu or lt grn-VTEC Pressure Switch / ANY OPEN SLOT
D7----lt grn/red----Data Link Connector / C8
D8
D9----wht/red------ALT / C17
D10---grn/blk------ELD / D16
D11--red/blk-------TP Sensor / D1
D12---wht/blk------EGR Valve Lift Sensor / D9
D13---yel/blu-------ECT Sensor / D2
D14---wht----------HO2S Sense / D7
D15---red/yel------IAT Sensor / D8
D16
D17---wht/blu------MAP Sensor / D4
D18---lt grn/blk----VREF (A/T)
D19---red/wht------EGR Valve Lift Sensor
D20---yel/wht------TP Sensor / D10
D21---blu/wht------MAP Sensor / D3
D22---grn/wht2----TP Sensor

 

[Black Widow g2]

So you can do it without having to use the conversion harness? I just learned something! Thank you for that info... if I notice anyone else doing a similar swap, I will point them your way!

 

[Kyle21nluvnit]

you can do it without the conversion kit but you would still have to remove the ecu connector from the prelude harness and repin from the designated pins on the right to the pins on the left. its still much more work than the conversion harness but if your capable of doing it, why not save some money?

 

[Kyle21nluvnit]

Hey just want to let everyone know that I got the OBD2a to OBD1 conversion harness and vtec subharness from rywire.com, above is the directions to make your own conversion harness I promise its all right. But the rywire harness was amazing, If I had more time on this I would have done everything myself but if your going to buy a harness i strongly suggest getting it from rywire.

 

[Kyle21nluvnit]

it works