Electrical
2 compatibility entries for Honda
OBD1 ECU (P75) and OBD1 distributor with OBD0-to-OBD1 conversion harness
Documented conversion of an OBD0 EF8 CR-X to OBD1 using a P75 ECU and an OBD1 distributor from an Integra VTi-R; a DC2 distributor bolted up and worked well. The car ran Crome with a stock 203 ROM for an OBD1 JDM B16A and started on the first attempt. The original single-wire O2 sensor works fine with the heater circuits disabled in the ROM. With this harness the blue 2-pin connector formerly used for setting timing (under the LH dash near the heater blower on EF8/EF9) becomes the SCS connector for OBD1 diagnostics and base-timing adjustment. Base ignition timing must be set with a timing light after conversion. A follow-up member completed the same conversion successfully with the car starting first go.
S2000 engine start button
Working conversion documented on a 1997 (5th-gen) Prelude. The key barrel, steering lock and factory immobilizer are retained; the key is turned to ON and the button is pressed and held to crank, exactly replicating S2000 operation. The relay schematic transfers to any Honda - a follow-up contributor fitted a JDM Civic Type R start button and panel to a Civic FD as a direct bolt-in using the same diagram (adding pin 1 illumination negative and pin 2 illumination positive), and another contributor wired a button on a DC2 with a simple two-wire hookup at the ignition barrel loom (constant 12 V plus starter wire). With the ignition on, the ENGINE START legend illuminates without the parking lights on; this matches factory S2000 behavior.