Vtec HONDA CIVIC 1998 6.G Owner's Manual

13. Remove the upper radiator hose' heater hose and
water bYPass hose
WATEREYPASSHOSEUPPERRADIATORHOSE
14.
HEATERHOSE
Remove the engine wire harness connectors and
wire harness clamps from the cylinder head and the
intake manifold.
o Four fuel injector connectors
. Engine coolant temperature (ECT) sensor con-
nector
a
a
a
ECT switch connector
ECT gauge sending unit connector
Throttle position sensor connector
Manitold absolute pressure (MAP) sensor con-
nector
Primary heated oxygen sensor (primary HO2S)
connector
Secondary heated oxygen sensor (secondary
HO2S) connector (D16Y7 engine)
Exhaust gas recirculation (EGR) valve lift sensor
connector (D16Y5 engine)
. VTEC solenoid valve connector (Dl6Y5, D16Y8
engrnes)
. VTEC pressure switch connector (D16Y5. D16Y8
engrnes,
. ldle air control (lAC) valve connector
15.Remove the spark plug caps and distributor from
the cylinder head.
Remove the uPPer bracket.
NOTE:
. Use a jack to support the engine before the
upper bracket is removed.
. Make sure to place a cushion between the oil
pan and the jack.
12 x 1.25 mm
74 N.m {7.5 kgf m.
sil lbl.ftl
UPPERBRACKET
'17. Remove the cylinder head cover'
CYLINDERHEAD COVER
(cont'd)
6-29

Gylinder Head/Valve Train
816A2 engine
Special Tools ............. 6'50 Rocker Arms
VTEC Contlol System
Troubfeshooting Flowchart ............ 6-51 Disassembly/Reassembly ...............6'72
VTEC Solenoid ValveRocker Arms and Lost Motion Assemblies
Inspection ...""'...... 5-54 Inspection .........""' 6-73
VTEC Rocker ArmsRocker Arms and Shafts
Manual Inspection ........................... 6-54 Clearance Inspection ..'..."'.............. 6-74
Inspection Using Special Tools .....' 6-55 Camshafts
Valve Clearance
.^ Adiustment .........." 6-57 Valves'Valve Springs and Valve Seals
. t Crankshaft Pulley and Pulley Bolt Removal """"""""' 6-77
Replacement ..".....6-59 Valve Seats
Timing BeltReconditioning ......6'78
Cylinder Headlnstallation '............ 6-82

VTEC Control SYstem
The scan tool indicates Diagnostic Trouble Code {DTC) Pl259:
VTEC Solenoid Valve circuit
Refer to page 1'l-38 through 11 55 before troubleshooting
Troubleshooting Flowchart
YES
A problem in the WEC Pressure Switch circuit or
* Road Test:Accelerate in 1st gear to an engine speed over 6,000 rp '
Hold that engine speed for at leasttwo seconos'
lf the DTC P1259 is not repeated during the first road test'
repeat this test two more times
VTEC PRESSURE SWITCH 2P
CONNECTOR
Terminalside ofmale termtnals
WM
/1 IBLU/BLKI
/ 1 Y------rt--------- l I
\1-/ |I
I
I1
Wire side of femaleterminals
(cont'd)
6-51
The MIL has been teported on.
DTC P1259 is siored.
Check the VTEC Control SYsiem:
1. Do the engine control module(ECM ) Reset Procedure (see
section 11).
2. Start the engine
3. Warm uP the engine to normal
operating temPerature (cool
ing fan comes on).
4. Do the Road Test.*lntermittent failure, sYstem is OK
at this time.Check for Poor connectlons or
loose wires at VTEC Pressureswilch. VTEC aolenoid valvo and
ECM.
ls DTC P1259 indicated?
Test the VTEC Pressure Switch:
1. Turn the ignition switch OFF.
2. Disconnect the VTEC Pressure
switch 2P connector.
3. Check for continuity between
VTEC pressure switch 2P con
nector telminal No 1 and
No.2.
Reolace the VTEC Pre3sure switch.
Test the VTEC Pressure Switch
Wire:1. Turn the ignition switch ON (ll).
2. N4easure the voltage between
VTEC press u re switch 2P
connector No. 1 and bodyground,
Inspect lor an open or short toground in the wire between the
VTEC orassure swilch and ECM
{c101.lf the wire i3 OK, substitute a
known-good ECM and recheck.
{To page 6 52)

VTEC Control System
Troubleshooting Flowchart (cont,d)
VTEC PRESSURE SWITCH 2PCONNECTOR
Wire side of temaleterminals
OIL PRESSURE GAUGE(Comm.rcially avail.bte)
GAUGE JOINT ADAPTERSNAP.ON MT26.1710 x 1.0 ftm. Use new washer wheninstalling the sealing bott.
NOTE: Keep measuring time as shorr aspossible because engine is running witn noload lless than one minute).
6-52
(
VTEC SOLENOID VALVE lPCONNECTOF
Ir------r I
lLl.ll-r
II
It
Terminal side ofmale terminal
I
(From page 6-5l l
(To page 6-53)
Test tha VTEC P.es3uro SwitchWi.e:Measure voltage across the VTECpressure switch 2P connector.
Ropair opon in the wiro batwoenVIEC pr...urc switch and G lot .lf the wiro is OK, 3ubltitutr aknown-good ECM and rochack.
ls there battery voltage?
Test the VTEC Solenoid V.tve:1. Turn the ignition switch OFF.2. Disconnect the VTEC solenoidvalve 1P connector.3. Check for continuity betweenthe VTEC solenoid valve 1Pconnector terminal No, I andbody ground.
ls there 14 - 30 O?
Te3t the VTEC Sotonoid Vatve:'1. Remove the VTEC pressureswitch and install the specialtool as shown. then reinstallthe VTEC pressure switch.2. Reconnect the VTEC solenoidvalve 1P connector and VTECpressure switch 2P connector,3. Connect the tachometer (seesection 1l).4. Start the engine.5. Warm up engine to normaloperatrng temperature (cool-ing fan comes on).6. Check oil pressure at enginespeed of 1,000,3,000 and5,000 rpm.
ls pressure below 49 kPa(0.5 kgflcm,,7 psi)?Inipoct thg VTEC aolenoid valvel3ee P8go 6-54).
I

(From page 6-52)
Test the VTEC Solenoid Valve:
1. Turn the ignition switch OFF
2. Disconnect the VTEC solenoid
valve 1P connector,
3. Attach the batterY Posrtrveterminal to the VTEC solenoid
valve terminal.4. Start the engine and check
the oil Pressure at engine
speed ol5,000 rPm
lrcoect the VTEC solenoid valve(see page S54)ls the pressure above 390 kPa(4.0 kgt/cm?, 57 Psi)?
Test the VTEC Pressure Switch:
With the battery Positive terminal
connected to the VTEC solenoid
valve, measure voltage between
the ECM connector terminal C10
and body ground.
ls there battery voltage above
5,000 rpm?
Test the VTEC Solenoid Valve
Wire:1. Turn the ignition switch OFF
2. Check for continuitv between
the VTEC solenoid valve 1P
con nector terminal and the
ECM connector terminal 812
Repair open in the wire between
the ECM lB12| and VTEC aolenoid
Test lhe VTEC Solenoid Valve
Wire:Check for continuity between the
VTEC solenoid valve'lP connector
terminal and body ground.
Repair short in the wiro b€'tween
the ECM ( 812) and VTEC aolenoid
Substitute a known'good ECM
and recheck. lI sYmptom/indica'tion goes away. repleca the origi-
nal ECM.
VTEC SOLENOID VALVE
1P CONNECTOR
Terminal side ofmale terminal
VIEC SOLENOIDVALVE1P CONNECIOR
ECM CONNECTORB l2sP)
ECM CONNECTOR C (31PI
WM
Wire side ot female
termrnals
VTEC SOLENOID VALVE
1P CONNECTOR
I'ft
I
I
Wire side of female
termanal
6-53

VTEC Solenoid ValveVTEC Rocker Arms
a
I
(
Inspection
1. Remove the VTEC solenoid valve assembly fromthe cylinder head. and check the VTEC solenoidvalve filter for clogging.
. lf there is clogging, replace the engine oilfilter andengine oil.
6x1.0mm12 N.m (1.2 kgf.m, B,7 tbf.ftl
lf the filter is not clogged. push the VTEC solenoidvalve with your finger and check its movemenr.
. lf the VTEC solenoid valve is normal, check theengine oil pressure.
6x1.0mm12 N.m (1.2 kgtm,8.7 lbt.ft)
6-54
L-
SOLENOID
Manual Inspection
1. Set the No. 1 piston at TDC.
2. Remove the ignition wire cover and the wires.
3. Remove the ignition clamps while pulling up on theIock.
6xl.0mm9.8 N.m (1.0 kgl.m, 7.2 tbtftl
IGNITIONWIRE COVER
IGNITIONWIRE
\
LOCK

VTEC Rocker Arms
4.
Inspection Using Special Tools (cont,dl
Loosen the valve on the regulator and apply thespecified air pressure.
Specified Air Pressuro:
250 kPa {2.5 kgtlcm,, 36 psil- 490 kPa {5.0 kgtcm,, 7t psil
Make sure that the primary and secondary rockerarms are mechanically connected by the pistonsand that the mid rocker arms do no. move wnenpushed manually.
SECONDARYROCKER ARM
. lf any mid rocker arm moves independently ofthe primary and secondary rocker arms, replacethe rocker arms as a set.
Remove the tools.
Check the operation of the lost motion assembly bypushing on the mid rocker arm. The lost motionassembly should compress fully and operatesmoothly through its full stroke. Replace the assem_bly if it does not work smoothly.
After inspection. check that the Malfunction Indi_cator Lamp {MlL) does not come on.
7.
6-56
I
ll
;l

WATER BYPASS
HOSE
14. Remove the upper radiator hose, heater hose and
water bvpass hose.
HEATER
Remove the engine wire harness connectors and wlre
harness clamps from the cylinder head and the intake
manifold.
Four fuel injector connector
Engine coolant temperature (ECT) sensor connec-
tor
ECT gauge sending unit connector
ECT switch connector
ldle air control (lAC) valve connector
Manifold absolute pressure (MAP) sensor connec-
tor
Throttle position sensor connector
Primary Heated oxygen sensor (Primary HO2S)
connecror
VTEC solenoid valve connector
15.
a
a
a
a
a
\
16.
17.
Remove the spark plug caps and distributor form
the cylinder head.
Remove the upper bracket.
NOTE:
. Use a jack to support the engine before removing
the upp€r bracket is removed.
. Place a cushion between the oil panandthejack.
12 x 1.25 fin74 N.m 17.5 kgtm,
UPPER BRACKET
18. Remove the cylinder head cover.
{cont'd)
6-69

Rocker Arms
Removal
'1. Hold the rocker arms together with a rubber band to
prevent them from separating.
Remove the intake and exhaust rocker shaft oil con-
trol orifices, then remove the VTEC solenoid valve
and the sealing bolts.
NOTE: The shapes ofthe intake and exhaust oil con-
trol orifices are different, ldentify the parts as they
are removed to ensure reinstallation in the original
locauons.
2.
EXHAUST ROCKERSHAFT ORIFICE
INTAKE ROCKERORIFIGEClean.Clean.
O.RINGO.RINGReplace.
RUEBER BAND
Replace. _ (lX
-dJ'v-l- \
6-71
3. Screw 12 mm bolts into the rocker arm shafts.
Remove each rocker arm set while slowly pulling
out the intake and exhaust rocker arm shafts.
12 mm BOLTS
ROCKER ARM SHAFTS

System Description
Electrical Connections ('99 - 00 Models except Dl6Y5 engine with M/Tl
(cont'd)
T:I
1
0
EVAP PURGE CONTROLSoLENOtOVAIVEc26 ECTECTSENSOR
D
EVAP COI{TROL CANISIE R
IATSENSOR
ta-t
c25 tAT
HO2S(sENSoFt
EVAP BYPASS SOI.ENOID VALVE
cl Po2s{tc"Eso! 87
)wEGF coNTRoL solENoro vaLvE'"c16PHO2S
vlsBr2VTEC SOLEr{O|D VATVE
H02SiSENSOR 2),wA23 SHO2S
VTECPFESSUFESWITCH
sEt{soR
-t,.1 f
I
BRAKE SWITCH
c7 sG1
SENSOB(Buln l oF
@E
lfil
*_r
/V | GAUGE
* lassEMBLIIl-
SPEEOSENSOR
tr
D5VBSOLo4tND A14
N DTI
NC DTOSPEEDSENSOR
LS+ Bl7UNEAR SOLENOID VALVET'I AT?04LS- a3
LOCIPr. l03alP03LCA 01P CONTBOISOIENOiDVALVE BLCB 03IOI{IROL SOLENOID VAIV€ A
SHIFI COTITROL SOLENOID VALVE BSHE D2
POStTtON
t----
I
To IIIT!FLOCK CONTROL UNIT
--t
L
l-
I
I
11-40
-.._.._.._.._l
,'-J