2003 HONDA CIVIC %27

Engine Mechanical
Engine Block
Soecial Tools ............. 7 -2
Comoonent Location Index ......................................... 7-3
Connecting Rod and Crankshaft End Play
InsDection .............. 7-5
Crankshaft Main Bearing Replacement ...................... 7-6
Connecting Rod Bearing Replacement ...................... 7-8
Oil Pan Removal ....................... .......... 7-11
Crankshaft and Piston Removal ........ 7-12
Crankshaft Inspection ........................ 7-14
Block and Piston Insoection ........................................ 7-15
Cyfinder Honing ............ .".................... 7 -'17
Piston, Pin and Connecting Rod Replacement .......... 7-18
Piston Ring Replacement ................... 7 -21
Piston lnstallation .................... ........... 7-23
Connecting Rod Bolt Inspection .......' 7 -24
Crankshaft lnstallation .....................'. 7-24
Oil Pan lnstallation .................. ........... 7 -27
Transmission End Crankshaft Seal
lnstallation-ln Car ................... ........' 7 -28

1.
Block and Piston Inspection
Remove the crankshaft and pistons (se e pageT -121.
Check the piston for distortion or cracks,
Measure the piston diameter at a point I1 mm {0.4in.) from the bottom of the skirt. There are two
standard-size pistons (No Letter or A, and B). The
letter is stamped on the top of the piston. Letters
are also stamped on the block as cylinder bore
stzes.
Piston Diameter:
Standard (Newl:
No Letter {or A): 85.980 85.990 mm(3.3850 3.3854 in.)
B: 85.970-85.980 mm(3.3846-3.3850 in.)
Service Limit:
No Lefter lor A): 85.930 mm (3.3831 in.)
B: 85.920 mm 13.3827 in.)
Oversize Piston Diameter:
0.25: 86.230-85.240 mm (3.3949 -3.3953 in.l
4. Measure wear and taper in direction X and Y at
three levels in each cylinder as shown. lf
measurements in any cylinder are beyond the
oversize bore service limit. replace the block. lf the
block is to be rebored, refer to step 7 after reboring.
Cylinder Bore Size
Standard (New):
A or l: 86.010 86.020 mm
13.3862 3.3866 in.)
B or ll: 86.000 86.010 mm(3.3858 3.3862 in.)
Service Limit: 86.070 mm (3.3886 in.)
Oversize:
O.25t 96.250 86.260 mm (3.3957 3.3961 in.)
Reboring limit: 0.25 mm (0.01 in.l max.
Bore Taper:
Limit: (Difference between first and third
measurement) 0.05 mm (0.002 in.)
FirstMeasurement
SecondMeasutement
ThirdMeasurement
(cont'd)
7-15
6 mm {0.2 in.}
6 mm {0.2 in.}

23. Install the baffle plates.
6x1.0mm12 N.m(1.2 ksf m, 8.7 lbf ft)
24. Installthe oil pump (see page 8-14).
25. Installthe oil pan (see page 7-27).
26. Installthe cylinder head (see page 6-39).
27. Installthe transmission (see page 13-8).
28. Installthe engine assembly (see page 5-9).
1.
OilPan lnstallation
Remove old liquid gasket from the oil pan mating
surfaces, bolts, and bolt holes.
Clean and dry the oil pan mating surfaces.
Apply liquid gasket, P/N 08718-0009, evenly to the
cylinder block mating surface of the oil pan and to
the inner threads of the bolt holes.
NOTE: Do not install the parts if 5 minutes or more
have elapsed since applying liquid gasket. Instead,
reapply liquid gasket after removing old residue.
Installthe oil pan.
Tighten the bolts in two or three steps. In the final
step, tighten all bolts, in sequence, to 12 N.m (1.2
kgf m, 8.7 lbf.ft).
(cont'd)
2.
3.
4.
5.
Apply liquid gasketalong the broken line.
(}@
7-27

Component Location Index
OIL PUMPCHAIN TENSIONER
DRAIN BOLT
OIL PANRemoval, page 7 11Installataon, page 7-27
OIL PUMPOverhaLrl, page 8-8
HL]
BAFFLE PLATE
OIL FILTER FEED PIPEReplacement, page 8-7
OIL FILTERReplacement, page 8-6
OIL CONTROLORIFICE
WASHER
OIL PRESSURE SWITCHSwitch Test, page 8 4Oil Pressure test, page 8'4Replacement, page 8 16
-&\JrI
--t N\ksrarr lN-?cKEr dczt$)
#1
\OIL PUMPCHAIN GUIDE
8-3

Engine Lubrication
OilPump Overhaul
Exploded View
BAFFLE PLATE6x1.0mm12 N.m{1.2 kgf m,8.7 lbf.ft)
x 1.25 mm27 N.m6x1.0mm12 N.m11.2 kgf.m, 8.7 lbt ft)
(2.8 kst m, 20 lbt ft)Apply engine oiltothe bolt threads.
UPPER BALANCERSHAFT HOLDER
BALANCER SHAFTBEARINGS
Ptr
PU II
EU "
DOWEL PIN
REARBALANCERSHAFT
\
- /=.---'n
fs/
tw
FRONTBALANCERSHAFT
LOWERSHAFTBALANCERHOLDERSEALING BOLT39 N.m{4.0 kgf.m,29lbf.ftl
$--."Dowetem
8-8
\-

Engine Lubrication
Oil Pump Overhaul (cont'dl
10. Remove the set clip from the oil pumpchain
tensioner.
11. Install the oil pan (see pageT-27).
8-16
\
I
(Oif Pressure Switch Replacement
1. Discon nect the oil pressure switch connector, then
remove the oil pressure switch.
2. Apply liquid gasket to the oil pressure switch
threads, then installthe oil pressure switch.
(

Fuel and Emissions
Fuel and Emissions Systems
SpecialTools
General Troubleshooting
Information
DTC Troubleshooting lndex ....
Symptom Troubleshooting
1ndex...............
System Descriptions ................
Howto Set Readiness Codes ..
PGM-FlSystem
Component Location Index ....
DTC Troubleshooting ..............
MIL Circuit Troubleshooting ...
DLC Circuit Troubleshooting ..
Injector Replacement ...............
A,/F Sensor Replacement .........
Secondary HO2S
Replacement
ECT Sensor Reolacement .......
CMP Sensor B {TDC Sensor)
Replacement
IAT Sensor Replacement .........
Knock Sensor Replacement ....
CKP Sensor Reolacement .......
VTEC/VTC
Comoonent Location Index ....
DTC Troubleshooting ..............
VTC Oil Control Solenoid
Valve Removal/Test .............
CMP Sensor A Replacement ...
VTEC Solenoid Valve
Removal/lnsoection .............
ldle Control System
Component Location Index
DTC Troubleshooting ..............
A,/C Signal Circuit
TroubleshootinS ...................
Alternator FR Signal Circu it
TroubleshootinS ...................
EPS Signal Circuit
TroubleshootinS ...................
Brake Pedal Position Switch Signal
Circuit Troubleshooting .............
ldle Speed Inspection
ECM ldle learn Procedure .......
Fuel Supply System
Component Location Index
Fuel Pump Circuit Troubleshooting
1't-2
I I-J
11-7
1 1-10
11-12
11-46
11-49
11-52
11-97
11-109
11-111
11-113
11-113
11-114
11-114
11-115
11-115
11-116
11-117
1 1-1 18
11-127
11-128
11-128
11-129
1I-130
I t- t55
11-134
1 1- 135
1 1-137
1 1-138
1 1-139
1 1-140
11-141
11-144
Fuel PressureTest ................... 11-145
Fuel Lines Inspection ............... 11-146
Fuel Line/Ouick-Connect
Fittings Precautions ............. 1 1-148
Fuel Line/Ou ick-Con nect
Fittings Removal .................. 1 1-149
Fuel Line/Ou ick-Con nect
Fittings lnstallation ............... 11-150
Fuel Pressure Regu lator
Replacement ......................... 11-152
Fuel Fifter Replacement ........... 11-152
Fuel Pump/Fuel Gauge Sending
UnitReDlacement ................. 11-153
Fuel Pulsation Damoer
Rep1acement ......................... 11-154
Fuel Tank Reolacement ........... 11-155
Fuel GaugeSending UnitTest ....... 11-156
Low Fuel lndicatorTest ................. 1 1-158
Intake Air System
Comoonent Location Index .... 11-159
Throttle BodyTest ................... 11-160
Intake Air Bypass Control
Thermal Valve Test .............. 11-161
Air Cleaner Reolacement ........ 11-162
Air Cleaner Element
Reolacement ......................... 11-162
Throttle Cable Adjustment ...... 11-163
Th rottle Cable
Removal/lnstallation ............ 1 1-164
Th rottle Body Removal/
Installation .. 11-165
Th rottle Body Disassembly/
Reassemblv .......................... 11-166
Catalytic Converter System
DTC Troubleshooting .............. 1 1-167
PCV System
DTC Troubleshooting .............. 1 1-168
PCV Valve InsDection
and Test ...... 1 1- 169
PCV Valve Reolacement .......... 11-169
EVAP System
Component Location Index .... 11-170
DTCTroubleshooting .............. 11-171
EVAP Two Way Valve Test ...... 11-186
Fuel Tank Vaoor Control
Valve Test ... 11-187
EVAP Canister Replacement ... 11-189
Fuel Tank Vaoor Control
Valve Reolacement .............. 1 1-189Fuel Pressu re Relieving ...........

ECM Inputs and Outputs at Connector A (31P)
NOTE: Standard battery voltage is 12 V.
1AFS]TC2
]GP23IGPl^:^ I -:,6AFS+1
CKPIKS
'10
SG2t112ACV15TPST6AFS_18
VSS
19IVAP2Avcc221vccl
22
HTC+
23LG225CMPA
26CMPB(rDc)
27tGPts,l28rcPts329tGPts230GPLS 1
Wire side ol female terminals
Terminalnumb€rWho colorforminal nameDescriptionSignal
ELKAVHTAFSHTC (AIR FUEL RATIO(4./F)SENSOR HEATERCONTROL}
Drives Ay'F sensor heaterWith ignit'on switch ON {ll): battery voltageWith fully warmed up engine runnang: 0 V
2YEUBLKIGP2 (POWEB SOURCE)Power source for the ECMcircuitWith the ignition switch ON 1ll): battery voltageWith the ionition switch OFF: about 0 V3YEUBLKIGPl {POWER SOURCE)Power source for the ECMWith the ignition swatch ON {ll): battery voltageWith the ionition switch OFF: about 0 V4BLKPG2 (POWER GROUNDGround forthe ECM circuitLess than 1.0 V at all times5BLKPG1 (POWER GROUNDGround forthe ECM circuitLess than 1.0 V at all times6REDAFS + (AIR FUEL RATIO(A,/F}SENSOR, SENSOR 1+ stDE)
Detects Ay'F sensor{sensor 1) signal
18LUCKP (CRANKSHAFTPOSITION SENSOR)Detects CKP sensor signalWith engine running: pulses
9BED/BLU)K SENSOB)Detects knock sensor siqnalWith enqine knocking: pulses10YEL2 {SENSOR;ROUND);ROUND)Sensor qrounrLessthan 1.0V at elltimesG1 {SENSORSensor qroun(Lessthan 1.0V at alltimes12BLIVREDIACV (IDLE AIR CONTROL(IAC)VALVE)Drives IAC valveWith engine runningr duty controlled
RED/BLKTPS (THROTTLE POSITIONSENSOR)Detects TP sensor signalWith throttle fully open: about 4.8 VWith thronle fullv closed: ahout 0-5 VREDI/ELAFS (AIR FUEL RATIO(4,/F)SENSOR, SENSOB 1SIDE)
Detects !y'F sensor(sensor 1)signal
18WHT/GRNVSS (VEHICLE SPEEDSENSOR)Detects VSS signalWath ignition switch ON (lli and front wheelsrotating: cycles from about 0 V to about 5 V or
(cont'd)
11-19