2003 HONDA CIVIC catalytic converter

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.
11-46
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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
all the enable criteria are met.. 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. ECT at 158"F (70'C) or higher.. Intake air temperature (lAT) at 20"F (-7'C) or higher.. Vehicle speed is steady, and vehicle speed sensor
(VSS) reads more then 25 mph (13km/h).
Procedure
1. Connect the scan tool to the vehicle's data link \
connector (DLCi, and bring up the tool's generic \"
OBD ll mode.
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.

Fuel and Emissions Systems
a
a
How to Set Readiness Codes (cont'd)
Misfire Monitor and Readiness Code
. This readiness code is always set to available
because misfiring is continuously monitored.. l\4onitoring pauses, and the misfire counter resets, if
the vehicle is driven over a rough road.. Monitoring also pauses, and the misfire counter
holds at its current value. if the throttle position
changes more than a predetermined value, or if
driving conditions fall outside the range of any
related enable criteria,
Fuel System Monitor and Readiness Code
. This readiness code is always setto available
because the fuel system is continuously monitored
during closed loop operation.. Monitoring pauses when the catalytic converter,
EVAP control system, and Ay'F sensor monitors are
active.. Monitoring also pauses when any related enable
criteria are not being met. Monitoring resumes when
lhe enable criteria is again being met.
Comprehensive Component Monitor and
Readiness Code
This readiness code is always set to available because
the comprehensive component monitor is continuously
running whenever the engine is cranking or running.
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Catalytic Converter System
DTC Troubleshooting
DTC P0420: Catalytic System Efficiency
Below Threshold
NOTE: lf some of the DTCS listed below are stored at
the same time as DTC P0420, troubleshoot those DTCS
first, then recheck for DTC P0420.
P0137, P0138: Secondary Heated Oxygen Sensor(secondary HO2S) (Sensor 2)
P0141: Secondary HO2S (Sensor 2) heater
1. Reset the ECM {see page 1'l-4}, then continue to
step 2 through 5 to reset the readiness code.
2. Start the engine. Hold the engine at 3,000 rpm with
no load (in neutral) untilthe radiator fan comes on.
Drive for about l0 minutes without stopping. Your
speeo can vary.
With the transmission in 4th gear, drive at a steady
speed between 50 62 mph (80-'100 km/h) for
30 seconds.
Repeat step 4 three times. Between each repetition,
close the throttle completely for 1 2 seconds. lf
the engine is stopped during this part of the
procedure, repeat steps 3, 4 and 5.
Check for a Temporary DTC with the scan tool.
Does the scan tool indicate Temporaty DTC
P0420?
YES Check the TWC. lf necessary, replace the
TWC.I
NO Check for readiness code completion. lfthe
readiness is complete, it was a interminent failure,
and the system is OK at this time. lf the readiness
code is incomplete, repeat steps 2 through 5.1
4.
11-167

Manual Transmission
Transmission Removal (cont'd)
15. Remove the transmission mount bracket (A) and
transmission mounting bolt (B).
Remove the air cleaner bracket {C).
Raise the vehicle, and make sure it is securely
supponed.
Drain the transmission fluid. Reinstall the drain bolt
with a new washer (see page 13-3).
Remove the splash shield.
€Ds
to.
17.
18.
19.
db--qF
13-6
20.
21.
22.
23.
Remove the three way catalytic converter (TWC)
assembly (see step 30 on page 5-5)
Remove the driveshafts (see page 16-3).
Remove the intermediate shaft {see page 16-19).
Remove the front engine mount bracket mounting
bolt.
Remove the three bolts securing the transmission
rear mounI.
24.

Manual Transmission
Transmission Installation (cont'dl
'10. Installthe three rear mounting bolls for the
transmission rear mount.
59 N.m (6.0 kgf.m,43 tbf.ft)
Loosely tighten the front engine mount bracket
mounting bolt.
11.
12.
t5.
14.
Install the intermediate shaft (see page 16-24).
Installthe drivershafts (see page 16-17).
lnstall the three way catalytic converter (TWC)
assembly (see step 17 on page 5-12).
10 x 1.25 mm
13-10
6x1.0mm12Nm
15.Install the transmission mount bracket (A) and the
transmission mounting bolt {B).
12 x 1.25 mm54 N.m {5.5 ksf.m, 40lbf.ft)
12x 1.25 nn54 N.m(5.5 kgf.m,40 tbt.ft)
16.
17.
/t':::= 12 x 1.25 mm-) 54 N.m(5.5 kgf.m,40 tbf.ftl
Install the air cleaner bracket (C).
Install the two upper transmission mounting bolts.
12 x 1.25 mrn64 N.m (6.5 kgt.m,47 lbf.ftl
18. Remove the engine hanger and special tool from
engrne.