How to Substitute the PCM

Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.

Fig 1: Connecting HDS To DLC
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Make sure the HDS communicates with the PCM. If it doesn't, skip step 3 to 5 and clean the throttle body (see THROTTLE BODY CLEANING ) after this procedure.
Turn the ignition switch ON (II).
Select the INSPECTION MENU with the HDS.
Do the TP POSITION CHECK in the ETCS TEST.
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Remove the cover (D).

Fig 2: Removing Cover
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Disconnect the PCM connectors (A), (B), (C).
NOTE: PCM connectors A, B, and C have symbols (A (square), B (triangle), C (circle)) embossed on them for identification.
Remove the bolts (E), then remove the PCM (F).
Install a known-good PCM in the reverse order of removal.
Open the SCS with the HDS.
Turn the ignition switch ON (II).
NOTE: US model: DTC P0630 "VIN Not Programmed or Mismatch" may be stored because the VIN has not been programmed into the PCM; ignore it, and continue this procedure.
US model: Input the VIN to the PCM with the HDS.
Rewrite the immobilizer code with the PCM replacement procedure in the HDS; it allows you to start the engine.
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
Do the CKP pattern clear/pattern learn procedure.