Replacing the ECM/PCM
REPLACING THE ECM/PCMIf you replace the ECM/PCM, you must program (rewrite) it with the HDS to accept the transponder codes sent from the immobilizer receiver, or the engine will not start.
Preparation
To replace the ECM/PCM, you need these items:
^ Replacement ECM/PCM
^ One programmed ignition keys (master, valet, T5) for the vehicle.
^ HDS with the latest software
NOTE:
Make sure the setup and time are correct before you use the HDS. 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.
^ 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.
Procedure
1. Replace the ECM/PCM. Refer to the Fuel and Emissions section of the appropriate service manual, and follow the procedure.
2. Connect the HDS to the 16P data link connector (DLC).
3. Insert the programmed ignition key into the ignition switch, and turn the switch to ON (II). Turn on the HDS, then log in to the iN screen.
4. At the screen prompts, enter the VIN and the odometer reading, then verify the correct date and time.
5. From the System Selection Menu screen, select IMMOBI.
6. From the Mode Menu screen, select Immobilizer Setup.
7. From the Immobilizer Test Mode Menu screen, select Replace ECM/PCM.
8. Follow the on-screen prompts. If your HDS is not logged in to the iN, you will have to enter the PCM code you have retrieved from the iN Immobilizer Code Inquiry to proceed. When you are finished, turn the ignition switch to LOCK (0), then turn off and disconnect the HDS.
9. Do the idle learn procedure:
^ Make sure all electrical items (A/C, audio unit, defogger, lights, etc.) are turned off, then start the engine.
^ Let the engine reach its normal operating temperature (the cooling fans cycle twice).
^ Let the engine idle (throttle fully closed and with all electrical items off) for 10 minutes.