Ultra Affordable EFI for Honda OBD1¶

🔴 Community support ONLY 🔴 Support Statement 🔴 Facebook group 🔴 Discord 🔴

Available at the 💲rusEFI store💲

Firmware¶

The nicer single board uses OBD1 Beta Snapshot.

The sandwich dual PCB adapter board uses uaEFI firmware.

Technical Details¶

See uaEFI

⏩ Interactive Pinout ⏪

Adapter Schematics rev a

Single board Schematics rev d

Features¶

Reads the OEM distributor just fine (single tooth and 24 tooth)
On-board LSU 4.9 controller exposed on extra ECU plug
Flex fuel sensor input exposed on extra ECU plug
Option to use coil on plugs; see J4
Option to convert to hall position sensors; see J5
Option to upgrade to electronic throttle body; see J1+J2
Designed to fit the OBD2 enclosure - these are cheaper, also we have auxiliary section on the header so we need wider opening

Issue Tracker¶

Open-source firmware; see https://github.com/rusefi/fw-uaefi-Honda-OBD1/issues

Wiring¶

Aux header connector 12 pin 174913-6 housing / 90980-11129 terminal
Harness side Micro Fit 2x3 0430250600
Harness side Micro Fit 2x4 0430250808
Harness side Micro Fit terminal 0430300001
PCB side Micro Fit 2x3 0430450612

See Vault Of Honda OEM

OEM Cases¶

The 37820-p2e OBD2 case looks very similar to P28 OBD1 case.

FAQ¶

Q: Dow do I set the trigger?
A: You HAVE to trust the "popular vehicles>Honda OBD" button. Confirm your trigger offset with timing light, keep everything else!