OBD0 MPFI to OBD2A Jumper Harness Instructions
Please be careful when installing this harness. There are 8-12 wires that need to be connected for proper usage (8 wires for JDM ECU's, 12 for USDM ECU's). Incorrect installation may cause damage to your vehicle and/or engine computer.
If there are certain sensors that your engine or ECU does not require, just tape off that wire and leave it unhooked. You will need to have a STOCK wire harness where it plugs into the ECU. No added VTEC wires, etc. - STOCK. You will connect all of the new wires later. So after you have a completely stock harness, plug the ECU jumper into the stock ECU harness plugs and lets go:
1. Connect the BROWN wire to one of the black wires on the upstream/primary 4-wire O2 sensor (O2 heater control).
2. Connect one of the PURPLE wires to the green wire on the upstream/primary 4-wire O2 sensor (O2 ground).
3. Connect one of the YELLOW wires to one of the black wires on the upstream/primary 4-wire O2 sensor (O2 12v switch).
4. Connect the GREY wire to the white wire on the upstream/primary 4-wire O2 sensor (O2 signal).
Due to the number of different O2 sensor wire colors with aftermarket O2 sensors, these may vary, and you may need to try moving these. The colors listed in steps 1-4 should match the OEM Honda/Acura upstream/primary 02 sensor.
5. Connect the BLACK wire to the VTEC solenoid.
6. Connect the GREEN wire to the VTEC pressure switch. The VTEC pressure switch is located below the VTEC solenoid. Connect the GREEN wire on the conversion harness to the blue wire on the VTEC pressure switch connector. The other wire on the VTEC pressure switch connector should be connected to ground (recommended to connect to ground on thermostat housing).
7. Connect the WHITE wire to the knock sensor located on the back of the engine block. If your engine does not have a knock sensor, simply tape off this wire and leave it unhooked.
8. If you are using a GSR or H22 intake manifold and ECU with IAB control (ie: P72, P13), you can connect the RED wire to the pink/blue IAB wire of the IAB solenoid connector. The black/yellow wire from the IAB solenoid connector needs to be wired to a switched 12v power source. If you are not using IAB's, simply tape off this wire and leave it unhooked.
9. If using a USDM ECU - Connect the ORANGE wire to one of the black wires on the downstream/secondary 4-wire O2 sensor (O2 heater control). Not needed for a JDM ECU, and not present on the harness if you ordered the harness for a JDM ECU.
10. If using a USDM ECU - Connect one of the PURPLE wires to the green wire on the downstream/secondary 4-wire O2 sensor (O2 ground). Not needed for a JDM ECU, and not present on the harness if you ordered the harness for a JDM ECU.
11. If using a USDM ECU - Connect one of the YELLOW wires to one of the black wires on the downstream/secondary 4-wire O2 sensor (O2 12v switch). Not needed for a JDM ECU, and not present on the harness if you ordered the harness for a JDM ECU.
12. If using a USDM ECU - Connect the BLUE wire to the white wire on the downstream 4-wire O2 sensor (O2 signal). Not needed for a JDM ECU, and not present on the harness if you ordered the harness for a JDM ECU.
Due to the number of different O2 sensor wire colors with aftermarket O2 sensors, these may vary, and you may need to try moving these. The colors listed in steps 9-12 should match the OEM Honda/Acura downstream/secondary 02 sensor.
The CKF (crankshaft fluctuation sensor) is bypassed within the harness, and does NOT need to be connected or in place for any OBD2A ECU.
To check engine codes/DTC's, you will use the factory vehicle service check connector. Jumper the connector with a piece of wire or paperclip to flash check engine light codes on your dash check engine light/MIL indicator.
If there are certain sensors that your engine or ECU does not require, just tape off that wire and leave it unhooked. You will need to have a STOCK wire harness where it plugs into the ECU. No added VTEC wires, etc. - STOCK. You will connect all of the new wires later. So after you have a completely stock harness, plug the ECU jumper into the stock ECU harness plugs and lets go:
1. Connect the BROWN wire to one of the black wires on the upstream/primary 4-wire O2 sensor (O2 heater control).
2. Connect one of the PURPLE wires to the green wire on the upstream/primary 4-wire O2 sensor (O2 ground).
3. Connect one of the YELLOW wires to one of the black wires on the upstream/primary 4-wire O2 sensor (O2 12v switch).
4. Connect the GREY wire to the white wire on the upstream/primary 4-wire O2 sensor (O2 signal).
Due to the number of different O2 sensor wire colors with aftermarket O2 sensors, these may vary, and you may need to try moving these. The colors listed in steps 1-4 should match the OEM Honda/Acura upstream/primary 02 sensor.
5. Connect the BLACK wire to the VTEC solenoid.
6. Connect the GREEN wire to the VTEC pressure switch. The VTEC pressure switch is located below the VTEC solenoid. Connect the GREEN wire on the conversion harness to the blue wire on the VTEC pressure switch connector. The other wire on the VTEC pressure switch connector should be connected to ground (recommended to connect to ground on thermostat housing).
7. Connect the WHITE wire to the knock sensor located on the back of the engine block. If your engine does not have a knock sensor, simply tape off this wire and leave it unhooked.
8. If you are using a GSR or H22 intake manifold and ECU with IAB control (ie: P72, P13), you can connect the RED wire to the pink/blue IAB wire of the IAB solenoid connector. The black/yellow wire from the IAB solenoid connector needs to be wired to a switched 12v power source. If you are not using IAB's, simply tape off this wire and leave it unhooked.
9. If using a USDM ECU - Connect the ORANGE wire to one of the black wires on the downstream/secondary 4-wire O2 sensor (O2 heater control). Not needed for a JDM ECU, and not present on the harness if you ordered the harness for a JDM ECU.
10. If using a USDM ECU - Connect one of the PURPLE wires to the green wire on the downstream/secondary 4-wire O2 sensor (O2 ground). Not needed for a JDM ECU, and not present on the harness if you ordered the harness for a JDM ECU.
11. If using a USDM ECU - Connect one of the YELLOW wires to one of the black wires on the downstream/secondary 4-wire O2 sensor (O2 12v switch). Not needed for a JDM ECU, and not present on the harness if you ordered the harness for a JDM ECU.
12. If using a USDM ECU - Connect the BLUE wire to the white wire on the downstream 4-wire O2 sensor (O2 signal). Not needed for a JDM ECU, and not present on the harness if you ordered the harness for a JDM ECU.
Due to the number of different O2 sensor wire colors with aftermarket O2 sensors, these may vary, and you may need to try moving these. The colors listed in steps 9-12 should match the OEM Honda/Acura downstream/secondary 02 sensor.
The CKF (crankshaft fluctuation sensor) is bypassed within the harness, and does NOT need to be connected or in place for any OBD2A ECU.
To check engine codes/DTC's, you will use the factory vehicle service check connector. Jumper the connector with a piece of wire or paperclip to flash check engine light codes on your dash check engine light/MIL indicator.