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This page outlines the different options available for
each OBD generation.
each OBD generation.
Options for OBD0 cars:
OBD0 to OBD1 adapter harness: Allows the conversion of an OBD0 chassis to OBD1 ECU
configuration (1992 to 1995 Honda and Acura).
This adapter includes a pigtail sub harness setup whereby all the OBD1 specific connections are
pulled out from the adapter into a separate wiring harness with a 9 or 12 position plug. Such
connections are the knock sensor, Vtec solenoid, Vtec pressure switch, 4 wire O2 sensor
connections, etc... This greatly facilitates the chassis wiring mods required for this popular
conversion. The adapter is also configured so that the distributor wiring is a simple matter of
matching up wire colors, rather than trying to decipher Honda's change of heart on the wire
colors for the distributor sensors from 1991 to 1992. See the FAQ Section of this site
OBD0 to OBD2a adapter harness: Allows the conversion of and OBD0 chassis to OBD2a ECU
configuration (1996-1998 Civics, 1996-2001 Preludes and 1996-1999 Integras).
This adapter is configured much the same way as the OBD0 to OBD1 above, but also
incorporates the connections for OBD2 specific sensors, such as the fuel tank pressure sensor,
crank fluctuation sensor, as well as the 2nd O2 sensor. The distributor wiring is handled in the
same manner as the OBD0 to OBD1 adapter.
OBD0 to OBD2b adapter harness: Allows the conversion of an OBD0 chassis to OBD2b ECU
configuration (1999-2000 Civics and 2000-2001 Integras).
This adapter follows the same convention as the OBD0 to OBD2a above.
Any of the above products can also be configured for plug and play attachment of the APEX-i
V-AFC or V-AFC II fuel control computers as well as other fuel control devices.
configuration (1992 to 1995 Honda and Acura).
This adapter includes a pigtail sub harness setup whereby all the OBD1 specific connections are
pulled out from the adapter into a separate wiring harness with a 9 or 12 position plug. Such
connections are the knock sensor, Vtec solenoid, Vtec pressure switch, 4 wire O2 sensor
connections, etc... This greatly facilitates the chassis wiring mods required for this popular
conversion. The adapter is also configured so that the distributor wiring is a simple matter of
matching up wire colors, rather than trying to decipher Honda's change of heart on the wire
colors for the distributor sensors from 1991 to 1992. See the FAQ Section of this site
OBD0 to OBD2a adapter harness: Allows the conversion of and OBD0 chassis to OBD2a ECU
configuration (1996-1998 Civics, 1996-2001 Preludes and 1996-1999 Integras).
This adapter is configured much the same way as the OBD0 to OBD1 above, but also
incorporates the connections for OBD2 specific sensors, such as the fuel tank pressure sensor,
crank fluctuation sensor, as well as the 2nd O2 sensor. The distributor wiring is handled in the
same manner as the OBD0 to OBD1 adapter.
OBD0 to OBD2b adapter harness: Allows the conversion of an OBD0 chassis to OBD2b ECU
configuration (1999-2000 Civics and 2000-2001 Integras).
This adapter follows the same convention as the OBD0 to OBD2a above.
Any of the above products can also be configured for plug and play attachment of the APEX-i
V-AFC or V-AFC II fuel control computers as well as other fuel control devices.
Options for OBD1 cars:
OBD1 to OBD2a adapter harness: Allows the conversion of an OBD1 chassis to OBD2a ECU
configuration (1996-1998 Civics, 1996-2001 Preludes, 1996-1999 Integras).
Once again, this product incorporates a separate harness with a connector for the additional
connections required to permit the correct operation of a USDM OBD2a engine control unit.
Connections for the crank fluctuation sensor, fuel tank pressure sensor and 2nd O2 sensor are
included. This harness will also work for a JDM ECU, and will not require the connection of the
extra sensors incorporated into the separate harness.
OBD1 to OBD2b adapter harness: Allows the conversion of an OBD1 chassis to OBD2b ECU
configuration (1999-2000 Civics, 2000-2001 Integras).
Configuration is the same as OBD1 to OBD2a above.
Any of the above products can also be configured for plug and play attachment of the APEX-i
V-AFC or V-AFC II fuel control computers as well as other fuel control devices.
configuration (1996-1998 Civics, 1996-2001 Preludes, 1996-1999 Integras).
Once again, this product incorporates a separate harness with a connector for the additional
connections required to permit the correct operation of a USDM OBD2a engine control unit.
Connections for the crank fluctuation sensor, fuel tank pressure sensor and 2nd O2 sensor are
included. This harness will also work for a JDM ECU, and will not require the connection of the
extra sensors incorporated into the separate harness.
OBD1 to OBD2b adapter harness: Allows the conversion of an OBD1 chassis to OBD2b ECU
configuration (1999-2000 Civics, 2000-2001 Integras).
Configuration is the same as OBD1 to OBD2a above.
Any of the above products can also be configured for plug and play attachment of the APEX-i
V-AFC or V-AFC II fuel control computers as well as other fuel control devices.
Options for OBD2 cars:
OBD2a to OBD1 adapter harness: Allows the conversion of an OBD 2a chassis
to OBD1 ECU configuration (1992-1995 Civics, Integras and Preludes).
In this case, no external harnesses are required. All of the connections required for the OBD1
ECU are generally present in the OBD2 car. Items such as Vtec or Knock sensor on vehicles not
otherwise equipped would need wires to be added.
OBD2a to OBD2b adapter harness: Allows the conversion of an OBD2a chassis to OBD2b ECU
configuration (1999-2000 Civics, 2000-2001 Integras).
This would allow the plug and play swap of a 2001 ITR motor and ECU into your 1996 to 1998
Civic or 1996 to 1999 Integra. Otherwise, the ECU would not plug into your chassis or engine
harness and you would be faced with searching out other options for engine management.
to OBD1 ECU configuration (1992-1995 Civics, Integras and Preludes).
In this case, no external harnesses are required. All of the connections required for the OBD1
ECU are generally present in the OBD2 car. Items such as Vtec or Knock sensor on vehicles not
otherwise equipped would need wires to be added.
OBD2a to OBD2b adapter harness: Allows the conversion of an OBD2a chassis to OBD2b ECU
configuration (1999-2000 Civics, 2000-2001 Integras).
This would allow the plug and play swap of a 2001 ITR motor and ECU into your 1996 to 1998
Civic or 1996 to 1999 Integra. Otherwise, the ECU would not plug into your chassis or engine
harness and you would be faced with searching out other options for engine management.
Frog Engine Controls