2003 HONDA CIVIC EGR

Cylinder Honing
Only a scored or scratched cylinder bore should be
noneo.
Measure the cylinder bores {see page 7-15).
lf the block is to be reused, hone the cylinders and
remeasure the bores.
Hone the cylinder bores with honing oil and a fine(400 grit) stone in a 60 degree cross-hatch pattern
(A). Use only a rigid hone with 400 grit or finer
stone such as Sunnen, Ammco, or equivalent. Do
not use stones that are worn or broken.
When honing is complete, thoroughly clean the
engine block of all metal particles. Wash the
cylinder bores with hot soapy water, then dry and
oil them immediately to prevent rusting. Never use
solvent, it will only redistribute the grit on the
cylinder walls.
lf scoring or scratches are still present in the
cylinder bores after honing to the service limit,
rebore the cylinder block. Some light vertical
scoring and scratching is acceptable if it is not deep
enough to catch your fingernail and does not run
the full length of the bore.
'L
3.
7-17

wEc/wc
The i-WEC has a VTC (Variable Valve Timing Control) mechanism on the intake camshaft in addition to the usual
VTEC.
This mechanism improves fuel efficiency and reduces exhaust emissions at all Ievels of engine speed, vehicle speed.
and engine load.
The VTEC mechanism changes the valve lift and timing by using more than one cam profile.
The VTC changes the phase of the intake camshaft via oil pressure. lt changes the intake valve timing continuously.
HIGH
i
LOW <-ENGINE SPEED
Drivino ConditionVTC ControlDescriDtion
Qr Light-loadBase PositionCam angle is retarded to reduce the entry of exhaust
gas into the intake port and to achieve stable fuel
consumDtion durinq lean bu rn.
?l M ed iu m/h ig h-loadAdvance ControlCam angle is advanced for EGR effect and to reduce
this pumping loss. The intake valve is closed quickly
to help reduce the entry of airlfuel mixture into the
intake port and improve the charging effect.
€) High speedAdvance-Base PositionCam phase angle is controlled for optimum valve
timinq and maximum enoine oower.
{cont'd)
11-29

Fuel and Emissions Systems
(System Descriptions (cont'dl
VTC system. The VTC system makes continuous intake valve timing changes based on operating conditions.. Intake valve timing is optimized to allow the engine to produce maximum power.'CamangleisadvancedtoobtaintheEGReffectandreducethepumpingloss.Theintakevalveisclosedquicklyto
reduce the entry of the airlfuel mixture into the intake port and improve the charging effect.. Cam angle is reduced at idle to stabilize combustion and reduces engine speed.'lfamalfunctionoccurs,theVTCsystemcontrol is disabled and the valve timing is fixed at the fully retarded position.
MAXIMUM VTC ADVANCE 50'
i l(-4 sHoRT oVERLAP
'+-|l LoNG oVERLAP
VTEC system' The VTEC system changes the cam profile to correspond to engine speed. lt maximizes torque at low engine speedand output at high engine speed.. The low lift cam is used at low engine speeds, and the high lift cam is used at high engine speeds.
LOW SPEED VALVE TIMINGHIGH SPEED VALVE TIMING
TDC
MAXIMUM VTC ADVANCE 50'
11-30

DTC Pl456: EVAP Control(Fuel Tank Svstem)
System Leakage
The fuel system is designed to allow specified
maximum vacuum and pressure conditions. Do not
deviate from the vacuum and pressure tests as
indicated in these procedures. Excessive pressure/
vacuum would damage the EVAP components or cause
eventual fuel tank failure.
Special Tools Required
Vacuum Pump/Gauge, 0-30 in. Hg A973X-041-XXXXX
This is a two-trip code. Once cleared, it cannot be
reproduced in one trip. Also, cenain specific driving
and ambient conditions must occur before the ECM will
complete the system checks. Additional test drives may
still not meet the specific conditions needed to
reproduce the code.
Follow these troubleshooting procedures carefully to
ensure the integrity of the system and to confirm the
cause of the problem or code.
NOTE: Fresh fuel has a higher volatility that createsgreater pressure/vacuum. The optimum condltlon for
testing is fresh fuel, and must be less than a full tank. lf
possible, to assist in leak detection, add 1 gallon of
fresh fuel to the tank (as long as it will not fill the tank).just before starting these procedures.
Fuel Fill Cap Check
1. Check the fuel fill cap (the cap must say "lf not
tightened 3 clicks check engine light may come
on" ).
ls the proper luel till cap installed and properly
tightened?
YES Go to step 2.
NO- Replace or tighten the cap.I
2. Check the fuel fill cap seal.
ls the tuel fill cap seal missing or damaged?
YES- Replace the fuel fill cap.I
NO The fuelfill cap is OK. Go to step 3.
EVAP Canister Purge Valve Test
3. Disconnect the vacuum hose from the EVAP
canister purge valve (A), and connect a vacuum
oumo to the hose.
A973X-041-XXXXX
Turn the ignition switch ON (ll).
Apply vacuum to the hose.
Does the valve hold vacuum?
YES-The EVAP canister purge valve is OK. Go to
step 11.
NO-Go to step 6.
Turn the ignition switch OFF.
Disconnect the EVAP canister purge valve 2P
connecror.
5.
7.
{cont'd)
11-175

EVAP System
DTC Troubleshooting (cont'd)
DTC Pl457: EVAP Control System(EVAP Canister System)
Leakage
The fuel system is designed to allow specified
maximum vacuum and pressure conditions. Do not
deviate from the vacuum and pressure tests as
indicated in these procedures. Excessive pressure/
vacuum would damage the EVAP components or
cause eventual fuel tank system failure.
SpecialTools Required
Vacuum pump/gauge, 0-30 in.Hg A973X-041-XXXXX
This is a two-trip code. Once cleared, it cannot be
reproduced in one trip. Also, certain specific driving
and ambient conditions must occur before the ECfM will
complete the system checks, Additional test drives may
still not meet the specific conditions needed to16^r^.1' '^6 rh6 ^^.16
Follow these troubleshooting procedures carefully to
ensure the integrity of the system and to confirm the
cause of the problem or code.
NOTE: Fresh fuel has a higher volatility lhat creates
greater pressure/vacuum. The optimum condition for
testing is fresh fuel, and there must be less than a full
tank. lf possible, to assist in leak detection, add I gallon
of fresh fuel to the tank (as long as it will not fill the
tank), just before starting these procedures.
EVAP Canister Purge Valve Test
1. Disconnect the vacuum hose from the EVAP
canister purge valve (A), and connect a vacuumpump to the hose.
11-180
4973X-041-XXXXX
ECM CONNECTOR A I24P'
Wire side of lemale terminals
4.
7.
2. Turn the EVAP canister purge valve on with the
Honda PGM Tester, or connect ECM connector
terminal 821 to body ground with a jumper wire.
Turn the ignition switch ON (ll).
Apply vacuum to the hose.
Does the valve hold vacuum?
YES-Go to step 5.
NO-The EVAP canister purge valve is OK. Go to
step 10.
Turn the ignition switch OFF.
Disconnect the EVAP canister purge valve 2P
conneclor,
Check for continuity between EVAP canister purge
valve 2P connector terminal No. 2 and body ground.
EVAPCANISTEN PURG€VALVE 2P CONNECTOR
-4-
lll2l-fircs
IYEL/8Lu)(f])
I
Wire side offemale lerminals
ls there continuity?
YES-Go to step 8.
NO Repair open in the wire between the EVAP
canister purge valve and the ECM/PCM (821).I
Turn the ignition switch ON (ll).
t
b.
8.

\
Synchro Sleeve and Hub Inspection
and Reassembly
1. lnspectthe gearteeth on ali synchro hubs and
synchro sleeves for rounded off corners, which
indicate wear.
2. Install each synchro hub (A) in its mating synchro
sleeve (B), and check for freedom of movement. Be
sure to match the three sets of longer teeth (C) (120
degrees apart) on the synchro sleeve with the three
sets of deeper grooves (D) in the synchro hub. Do
not install the synchro sleeve with its longer teeth
in the 1sv2nd synchro hub slots (E) because it will
damage the spring ring.
NOTE; lf replacement is required, always replace
the svnchro sleeve and svnchro hub as a set.
Synchro Ring and Gear Inspection
1.Inspect the inside of each synchro ring (A) for wear.
Inspect the teeth (Bi on each synchro ring for wear
(rounded off).
Example of synchro ring teeth
Inspect the teeth (C) on each synchro sleeve and
matching teeth on each gear for wear (rounded off).
Example ofteeth and gear teeth
(cont'd)
I
Il
GOOD
synchro sleeve
GOOD
/\
I
WORN
tl
WORN
13-39

13. Attach the special tool to the mainshaft as follows:
. Back-out the mainshaft holder bolt {A) andloosen
the two hex bolts (B).
. Fit the holder over the mainshaft so its lip is
towards the transmission.. Align the mainshaft holder's lip around the
groove at the inside of the mainshaft splines,
then tighten the hex bolts.
14.
07GAJ-PG20130
Seat the mainshaft fully by tapping its end with a
plastic hammer.
Thread the mainshaft holder bolt in until it just
contacts the wide surface of the mainshaft base.
16. Zero a dial gauge {A) on the end ofthe mainshaft.
Turn the mainshaft holder bolt (B) clockwise; stop
turning when the dial gauge (A) has reached its
maximum movement. The reading on the dial
gauge is the amount of mainshaft end play
NOTE: Do not turn the mainshaft holder bolt more
than 60 degrees after the needle of the dial gauge
stops moving, this may damage the transmission.
lf the reading is within the standard, the clearance
is correct. lf the reading is not within the standard,
recheck the shim thickness.
Standard: 0.11 -0.17 mm (0.004 0.007 in.)
17.
18.
07GAJ-PG20130
13-45

Fit the boot ends onto the driveshaft and the
inboard joint, then install the new double loop band
{A) onto the boot.
Pull up the slack in the band by hand
Mark a position (A) on the band 10- 14 mm (0.4-
0.6 in.) from the clip {B).
15. Thread the free end ofthe band through the nose
section of the commercially available boot band
tool KD-3191 or equivalent (A), and into the slot on
the winding mandrel (B).
Place a wrench on the winding mandrel of the boot
band tool, and tighten the band until the marked
spot (C) on the band meets the edge of the clip
Lift uD the boot band tool tobendthefree end of
the band 90 degrees to the clip. Center-punch the
clio, then fold over the remaining tail onto the clip.
16.
17.
(cont'd)
16-13