OBD1 manual-transmission ECU (e.g. P28) with OBD2A-to-OBD1 ECU jumper harness
into Civic EK (from Civic)

EG Civic 1992-1995
→
EK Civic EK 1996-2000

Yes: the OBD1 manual-transmission ECU (e.g. P28) with OBD2A-to-OBD1 ECU jumper harness from the Civic (1992-1995) fits the Civic EK (1996-2000) — easy difficulty, no modifications listed.

Verdict
Fits.
Verified entry · no modifications listed
Verified ✓
Difficulty
Easy
Mods
None
Category
Electrical

Installation notes

Yes — a 1992–1995 Civic (EG) OBD1 manual ECU such as the P28 fits a 1996–1998 Civic (EK) with an OBD2A-to-OBD1 ECU jumper harness. SpeedFactory's jumper (SFR-01-041) is listed for 1996–1998 Civic, Integra, Prelude and Accord, 1997–1998 CR-V and 1996–1997 del Sol, and accepts 1992–1995 manual ECUs including the P28, P30, P72 and P61. Moates' Honda overview says owners of 1996–2001 cars remove the stock OBD2 ECU and plug in a supported OBD1 ECU through a conversion harness, because Moates' tuning hardware supports the OBD1 ECUs. Hondata's s300 plugs into P06, P28, P30, P72, P74 and P75 ECUs.
Caution

Important caveats

  • Manual-transmission ECUs only: the jumper is not compatible with OBD1 automatic ECUs.
  • The OBD2A jumper is for 1996–1998 cars only; 1999+ OBD2B cars need a different harness.
  • The OBD1 ECU still needs a chip or tuning device (such as Hondata s300) and a tune that suits the engine.
  • Fitting an OBD1 distributor needs a separate distributor jumper; the sources do not say an OBD1 distributor is required for the ECU swap itself.
  • Emissions and inspection rules may not allow replacing the factory OBD2 ECU; check local law.

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Reference

D14A1 specs → LEB-H5 specs → B18A1 specs → K24A8 specs → K24A4 specs → D16A6 specs → B18C2 specs → B18C7 specs → D16W4 specs → EC specs → ED specs → EE specs → EG specs → EK specs → EL specs → EM specs → EP specs → ER specs → ES specs → EW specs → S20 Hatchback/del Sol Transmission (EH2 , EG1) → P75 Cylinder Head → P72 Cylinder Head → P72 Camshaft → P28 Camshaft → P30 Camshaft → P06 Fuel injector → P72 Fuel injector → P30 Fuel injector → P28 Throttle body → P72 Throttle body → P30 Throttle body → RNE ECU → P74 ECU → P61 ECU → P06 ECU → P72 ECU → P28 ECU → P30 ECU → P08 Intake Manifold → P28 Intake Manifold → P30 Intake Manifold → P72 → P30 → P28 → P72 → P75 → P06 → P72 → P30 → P28 → P30 → P28 → P72 → P30 →

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Sources

4 refs
  1. 01 https://www.hybrid-racing.com/products/speedfactory-obd2a-obd1-ecu-jumper-harness
  2. 02 https://shop.moates.net/pages/honda-overview-read-me
  3. 03 https://www.hondata.com/s300
  4. 04 https://www.hybrid-racing.com/products/speedfactory-obd2-obd1-distributor-jumper-harness
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