Honda Civic Service Manual page 213

Fuel and Emissions Systems
General Troubleshooting Information (cont'd)
ECM Updating and Substitution for Testing
Special Tools Bequired
Honda Interface Module (HlM) EOS05435570
Use this procedure when you have to substitute a
known-good ECM in a troubleshooting procedure.
U pdate the ECM only if the ECN4 does not already have
the latest software loaded,
NOTE;
. lMake sure the battery is fully charged before you
update the ECN4.
. 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
1. Turn the ignition switch ON (ll). Do not startthe
e n g I n e .
2. Connect the Honda lnterface Module (HlM) to the
Data Link Connector {DLC) (A) located under the
d r i v e r ' s s i d e o f d a s h b o a r d .
EOS05A35570
Do the ECM update procedure as described on the
HlN4 label and in the ECM update system.
1 1 - 6
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How to Substitute the ECM
'1.
Remove the ECM f rom the vehicle.
2. Install a known-good ECM in the vehicle.
3 . R e w r i t e t h e i m m o b i l i z e r c o d e w i t h t h e E C M
replacement procedure from the Honda PGM
Tester. lt allows you to start the engine.
4. After completing your tests, reinstall the original
E C M a n d r e w r i t e t h e i m m o b i l i z e r c o d e w i t h t h e
E C M r e p l a c e m e n t p r o c e d u r e o n t h e H o n d a P G M
T e s t e r a g a i n .
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