Honda Civic Service Manual page 253

Fuel and Emissions Systems
How to Set Readiness Codes
Malfunction lndicator Lamp (MlL) Indication
(ln relation to Readiness Codesl
The vehicle has certain "readiness codes" that are part
of the on-board diagnostics for the emissions systems.
lf the vehicle's battery has been disconnected or gone
dead, if the DTCS have been cleared, or if the ECM has
been reset, these codes are set to incomplete. In some
states, part of the emission testing is to make su re these
codes are set to complete. lf all of them are not set to
complete, the vehicle may fail the emission test, or the
test cannot be finished.
To check ifthe readiness codes are complete, turn the
ignition switch ON (ll), but do not start the engine. The
MIL will come on for 15 20 seconds. lf it then goes off,
the readiness codes are complete. lf it blinks several
times, one or more readiness codes are not complete.
To set readlness codes from incomplete to complete.
do the procedure for the appropriate code.
1 1 - 4 6
L
Catalytic Converter Monitor and Readiness
Code
NOTE:
. Do not turn the ignition switch off during the
procedure.
. All readiness codes are cleared when the battery is
disconnected or when the ECM is cleared with the
OBD ll scan tool or Honda PG lvl Tester.
. Low ambient temperatures or excessive slop-and-go
traffic may increase the drive time needed to switch
the readiness code from incomplete to complete.
' The readiness code will not switch to com Dlete until
a l l t h e e n a b l e c r i t e r i a a r e m e t .
. lf a fault in the secondary HO2S system caused the
MIL to come on. the readiness code cannot be set to
comDlete until vou correct the fault.
Enable Criteria
. E C T a t 1 5 8 " F ( 7 0 ' C ) o r h i g h e r .
. I n t a k e a i r t e m p e r a t u r e ( l A T ) a t 2 0 " F ( - 7 ' C ) o r h i g h e r .
. Vehicle speed is steady, and vehicle speed sensor
( V S S ) r e a d s m o r e t h e n 2 5 m p h ( 1 3 k m / h ) .
Procedure
1 . C o n n e c t t h e s c a n t o o l t o t h e v e h i c l e ' s d a t a l i n k
\
c o n n e c t o r ( D L C i , a n d b r i n g u p t h e t o o l ' s g e n e r i c
\ "
O B D l l m o d e .
Start the engine.
Test-drive the vehicle under stop-and-go conditions
with short periods of steady cruise. After about
5 miles (3 km), the readiness code should switch
from incomplete to complete.
lf the readiness code is still set to incomplete, check
for a temporary DTC. lf there is no DTC, one or
more of the enable crlteria were probably not met;
2 .
3 .