Replacing the ECM/PCM

REPLACING THE ECM/PCM

If you replace the ECM/PCM, you must use the HDS to instruct the new ECM/PCM and the immobilizer keyless control unit to recognize each other's unique serial code or the engine cannot start.

Preparation

To replace the ECM/PCM, you need these items:

^ Replacement ECM/PCM

^ One programmed ignition key for the vehicle

^ PCM code

NOTE:
If you cannot log in to the iN screen on the HDS, you must retrieve the PCM Code from the Immobilizer Code Inquiry in the iN.

^ HDS with the latest software

NOTE:
Make sure the market, the date, and the time on the HDS setup screen are correct. Select the F12 key in the upper right corner to get the Set-up Details screen. Make sure Market: is set to USA. Select the time display in the lower right corner to get the Date/Time Properties pop-up window. Make sure the date and time are correct. For details, refer to the Honda Diagnostic System (HDS) Setup Instructions listed under Tool Information in ISIS.

Procedure

^ Refer to the appropriate service manual, or

^ Online, enter keywords PCM REP, and select ECM/PCM Replacement (for Accords) or PCM Replacement (for Pilots) from the list.