2003 HONDA CIVIC Workshop Manual

Intake Air System
1. Remove the nuts (A) and the stud (B).
Air Cleaner Replacement
Remove the air cleaner (C).
Install in the reverse order of removal.
2.
3.
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Air Cleaner Element Replacement
1. Disconnect the PCV hose 1A).
Open the air cleaner housing cover (B).
Remove the air cleaner (C) from the air cleaner
housing (D).
Install in the reverse order of removal.
2.
3.\,
4.
{0.3 kgf m,2lbf.ft)

Throttle Cable Adjustment
1.Check cable free play at the throttle linkage. Cable
free pf av (A) should be 10 12 mm (3/8 1/2 in.).
lf the free play is not within spec (10 - 12 mm,
318-112ln.l,loosen the locknut (B), turn the
adjusting nut (C) untilthe free play is as specified,
then retighten the locknut.
With the cable properly adjusted, check the throttle
valve to be sure it opens fully when you push the
accelerator pedal to the floor. Also check the
throttle valve to be sure it returns to the idle
position whenever you release the accelerator
peoar.
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Intake Air System
Throttle Cable Removal/lnstallation
1. Fully open the throttle valve, then remove the
throttle cable (A) from the throttle link (B).
Remove the cable housing (C)from the cable
bracket (D).
Remove the throttle cable (A)from the accelerator
pedal (B).
2.
3.
SILICONE GREASE B(P/N 08798-9002)
(P/N 08?98-9002)
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5.
Install in the reverse order of removal.
After installing, start the engine. Hold the engine at
3,000 rpm with no load (in neutral) untilthe radiator
fan comes on, then let it idle.
Hold the cable, removing all slack from it.
Set the locknut on the cable bracket {A).Turn the adjusting nut (B) so that its free play is
0 mm.
The should beno crearance.
Remove the cable from the cable bracket (A). Set
the adjusting nut on the other side of the throttle
bracket, then tighten the locknut {C}.
With the cable properly adjusted, check the throttle
valve to be sure it opens fully when you push the
accelerator pedal to the floor. Also check the
throttle valve to be sure it returns to the idle
position whenever you release the accelerator
Deoat.
7.
!
8.
9.
('1.0 kgf.m,7.2 tbf.ftl

Throttle Body Removal/lnstallation
NOTE:' Do not adjust the throttle stop screw.. Afterreassembly,adjustthethrottlecable{seepagell-163) and the cruise control cable (see page 4-45).. The throttle position (TP) sensor is not removable.
THROTTLELEVER
There should beno clearance
THROTTLE CABLE
MANIFOLDABSOLUTE PRESSURE{MAP} SENSOR
22Nm(2.2 kgt.m, 16 lbf.ft)
EVAPORATIVE EMISSION {EVAPICANISTER PURGE VALVE
IDLE AIR CONTROL{IACI VALVE
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Intake Air System
Throttle Body Disassembly/Reassembly
EVAPORATIVE EMISSION {EVAP)CANISTER PURGE VALVE
A
V
2 N.m{0.2 kgt m, 1 lbf.ft)
3.5 N.m(0.35 kgf m.2.5lbf ft)
MAP SENSOR
THROTTLE BODY
L
TP SENSOR
11-166

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.
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PCV System
DTC Troubleshooting
DTC P1505: PCV Air Leakage
1. Reset the ECM (see page 11-4).
2. Start the engine. Hold the engine at 3,000 rpm with
no load (in neutral) until the radiator fan comes on
3. Let the engine idle tor al least 40 seconds with the
throttle fully closed.
4. Check for a DTC P1505 with the scan tool
ls DTC P1505 indicated?
YES-Check these parts for vacuum leaks l
. PCV valve. PCV hose. EVAP canister purge valve
. Throttle body. Brake booster hose
NO - Intermittent failure, system is OK at this
time.l
11-168

PCV Valve Inspection and Test
2.
1. Check the PCV valve (A), hoses {B), and
connections for leaks or restrictions.
At idle, make sure there is a clicking sound from the
PCV valve when the hose between the PCV valve
and intake manifold is lightly pinched {A)with your
fingers or pliers.
lf there is no clicking sound, check the PCV valve
grommet for cracks or damage. lf the grommet is
OK. reDlace the PCV valve and recheck.
PCV Valve Replacement
'LDisconnect the PCV hose.
Remove the PCV valve (A).
3. Install
with a
(4.5 kgf.m,33 lbf.ft)
the parts in the reverse order of removal
new gasket (B).
11-169