This harness adapter will allow you to use an older OBD1 1992 to 1995 ECU ( 1992 to 1995 computer) in your newer Honda or Acura vehicle.

• 1988-1991 Honda CRX- (Hf, Si or MPFI converted only)
• 1988-1991 Honda Civic- (Ex, Si or MPFI converted only)
• 1988-1991 Acura Integra

to run any HONDA / ACURA OBD1 1992-1995 ECU

INSTRUCTIONS FOR SUB HARNESS

Additional Parts Needed:
Some additional plugs may be required, such as the OBD-1 or OBD-2 distributor plugs and the 4-wire 02 sensor plug. Other plugs, such as the VTEC solenoid plug, VTEC pressure switch plug and knock sensor plug may be required, depending on what ECU and engine your are running. It is recommended to use the original OBD-1 plugs for a cleaner installation. If you are unable to locate the plugs, you may splice directly in the existing plugs.

 

Wire Color Item Function:

• Blue - P02SHTC - 02 Sensor Heater Control (02BLK Wire)


• White - PH02S - 02 Sensor Signal (02 WHT Wire)


• Violet - VTS - VTEC Solenoid Signal


• Gray - VTM - VTEC Pressure Switch Signal


• Green - IAB - Intake Air Bypass Signal


• Orange ? KS - Knock Sensor Signal


• Red or Pink (2) - IGP Power (IAB, 02, BLK Wire)


• Black or Brown - (3) -PG Ground - (SCS, VRM, 02 GRN Wire)


• Yellow ? SCS - Service Check Signal

Installation Notes:

IAB is only used on certain engines and only looked for by certain ECU's (P72) & P13). For all other applications, it is not required.

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Parts needed for this conversion - MPFI and DPFI vehicles 

·       OBD1 or OBD2 distributor that fits your engine 

·       Distributor connector (engine harness side) 

·       OBD1 or OBD2 Honda/Acura 4-wire oxygen (O2) sensor 

·       4-wire oxygen sensor connector (engine harness side) 

·       OBD1 ECU 

·       VTEC, IAB, and knock sensor connectors (engine harness side) 

if applicable to your engine/ECU combination
Additional parts needed if converting a stock DPFI vehicle to OBD1 

·       Four fuel injectors that are properly sized for your ECU 

·       Fuel injector resistor box if using low impedence fuel injectors 

·       Four fuel injector connectors that fit your fuel injectors 

MPFI Models 

88-91 CRX Si and HF 88-91 Civic Si
88-91 Integra 

DPFI Models 

88-91 CRX DX
88-91 Civic DX and Std 

·       You must use the proper conversion harness type on your vehicle. MPFI conversion harnesses WILL NOT work on DPFI vehicles and vice versa. 

·       If your DPFI vehicle has been previously converted to MPFI, then use a MPFI conversion harness. 

·       MPFI conversion harnesses have a sub-harness with an 8- position white connector. 

·       DPFI conversion harnesses have a sub-harness with an 8- position and a 4-position white connector. 

Important notes on OBD0 and OBD1 fuel injection differences 

·       You may use low impedence type fuel injectors with an OBD1 ECU but you MUST use a factory resistor box. 

·       MPFI models have a resistor box in place from the factory. 

·       DPFI models DO NOT have a resistor box from the factory. 

·       If you are using high impedence fuel injectors, REMOVE the resistor box from your vehicle. 

Low Impedence Fuel Injectors High Impedence Fuel Injectors 

OBD0 CRX Si & HF OBD1 and OBD2 Civic OBD0 Civic Si OBD1 and OBD2 Integra OBD0 Integra OBD2 Prelude
OBD1 Prelude 

How to remove a resistor box from your MPFI vehicle 

·       Unclip the resistor box connector. 

·       Unbolt and remove the resistor box from your vehicle. 

·       Cut the resistor box connector off of the engine harness. 

·       Splice together ALL the cut wires that were going into the connector. We recommend soldering the wires together. Use electrical tape or heat-shrink tubing to insulate the connection.