Ecm Updating And Substitution For Testing; How To Update The Ecm; How To Substitute The Ecm - Honda Civic 2002-2003 Service Manual

Fuel and Emissions Systems
General Troubleshooting Information (cont'd)
ECM Updating and Substitution for Testing
Special Tools Required
Honda Interface Module (HIM) EQS05A35570
Use this procedure when you have to substitute a
known-good ECM in a troubleshooting procedure.
Update the ECM only if the ECM does not already have
the latest software loaded.
NOTE:
• Make sure the battery is fully charged before you
update the ECM .
• To prevent ECM damage during the update, do not
turn the ignition switch OFF, and do not use any of
the vehicle's electrical devices (light, horn, radio, etc. ).
How to Update the ECM
,. Turn the ignition switch ON (II). Do not start the
engine.
2. Connect the Honda Interface Module (HIM) to the
Data Link Connector (DLC) (A) located under the
driver's side of dashboard.
---',,-
EQS05A35570
3. Do the ECM update procedure as described on the
HIM label and in the ECM update system.
11-6
How to Substitute the ECM
,. Remove the ECM from the vehicle.
2. Install a known-good ECM in the vehicle.
3. Rewrite the immobilizer code with the ECM
replacement procedure from the Honda PGM
Tester. It allows you to start the engine.
4. After completing your tests, reinstall the original
ECM and rewrite the immobilizer code with the
ECM replacement procedure on the Honda PGM
Tester again.
•