1996 HONDA CIVIC Body

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VTEC Control System
Troubleshooting Flowchart (cont'd)
VTEC PRESSURE SwlTCH 2PCONNECTOR
Wire side of female(€rmrnats
VTEC SOLENOID VALVE lPCONNECTOR
I r----'t I
ll ' ff---r'-'1
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-L
Terminal side ofmale terminal
A/T LOW PRESSUREw/PAt{EL07406-0070300
NOTE: Keep measuring time as short aspossible because engine is running with noload (less than one minute).
PRESSURE GAUGEADAPTER07NAJ - P07010A
A/T PRESSURE I{OSE07406 - 0020201
ot
A/T PRESSURE HOSE.2,210 mm07MAJ - PY&llA andA/T PRESSURE ADAPTER07MAJ - PY,()120
6-4
(From page 6-3)
(To page 6-5)
Test the VTEC Pr6suro SwitchWiro:Nleasure voltage across the VTECpressure switch 2P connector.
. Rcpai. opon in tho wirebrtw.en VTEC pr6.urc switchand G101.. lf th. wir6 b OK, sub.thuto alnown-good ECM/PCM !ndracheck.
ls there baftery voltage?
Te3t the VTEC Solonoid V.lve:1. Turn the ignition switch OFF.2. Disconnect the VTEC solenoidvalve 1P connector.3. Check for continuity betweenthe VTEC solenoid valve 1Pconnector terminal No. 1 andbody ground.
ls there 14 - 30 0?
Te3t tho WEC Solonoid Vatvo:'1. Remove the VTEC pressureswatch and install the specialtool as shown, then reinstallthe VTEC pressure switch.2. Reconnoct the VTEC solenoidvalve 1P connector and VTECpressure switch 2P connector.3, Connect the tachometer (seesection 11).4. Stan the engine.5, Warm up engine to normaloperating temperature (cool,ing fan comes on).6. Check oil pressure at enginespeeds D16Y5 engine: 1,000and 3.000 rpm, D16Y8 engine:1,000,3,000 and 5,000 rpm.
ls pressure below 49 kPa(0.5 kgflcm,, 7 psi)?In.poct the VTEC aolonoid vllvols.c p.g. &6).
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(From page 6'4)
Test the VTEC Solenoid Valve:1. Turn the ignition switch OFF.2. Disconnect the wEC solenoidvalve 1P connector.3. Attach the battery positave
terminal to the VTEC solenoidvalve terminal.4. Start the engine and checkthe oil pressure at enginespeed of 5,000 rpm.
Inspect lhe VTEC solonoid valve
lsee p6ge m).ls the pressure above 390 kPa(4.0 kgtcm',57 psi)?
Test the VTEC Pressure Switch:With the battery positive terminalconnected to the VTEC solenoidvalve, measure voltage betweenthe ECM/PCM connector terminal'96 - 98: Cl5,'99 - 00: C10 andbody ground.
ls there battery voltage above5,000 rpm?
T6st the VTEC Solenoid Valvewire:1. Turn the ignition switch OFF.2. Check for continuity betweenthe VTEC solenoid valve 1Pconnector terminal and theECM/PCM connector terminal'96 - 98: A8, '99 00r B'12.
Repair open in the wire betweenthe ECM/PCM ('96 - 98: A8, '99 -
0o: 8l2l and VTEC solenoid v.lv6connoc{or.
Test the VTEC Solenoid Valve
Check for continuity between theVTEC solenoid valve 1P connectorterminal €nd body ground.
ReDair 3hort in the wire betweenthe ECM/FCM ('96 - 98: A.8, '99 -
0O: Bl2l and VTEC aolenoid valveconnectot,
ls there continuity?
Substitute a known-good ECM/PCM and recheck. lf symptom/indication goes away, replacethe original ECM/PCM.
VTEC SOLENOID VALVE1P CONNECTOR
Terminalside ofmale terminal
ECM/PCM CONNECTOR C {31P}
'99 - 00:'96 - 98:
CONNECTOR
'99 - 00:
VTEC SOLENOIDVALVE
ECM/PCM CONNECTORB {25Pt1P CONNECTOR'96 - 98:
VTEC SOLENOIDVALVE
ECM/PCM CONNECTOR
A {32P1
VTS{GRN/YEL)
wire side o{ femaleterminals
wire side oI temaleterminals
VTM

VTEC Solenoid Valve
Inspection
1.
6x1.0mm12 N.m 11.2 kgf.m,8.7 lbtft)
Disconnect the 1P connector from the VTEC sole-noid valve.
Measure resistance between the terminal and bodyground.
Resistance: l4 - 30 O
lf the resistance is within specifications, remove theVTEC solenoid valve assembly from the cylinder
head, and check the VTEC solenoid valve filter for
cloggrng.
. lf there is clogging, replace the engine oil filterand the engine oil.
VTEC SOLENOID VAI-VE ASSEMBLY
6-6
(
4. lf the filter is not clogged, push the VTEC solenoidvalve with your finger and check its movement.
. lf the VTEC solenoid valve is normal. check the
engane oil pressure.
6x1.0mm12 N.m {1.2 kgt.m,8.7lbf.ft)
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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
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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
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Wire side of female
termanal
6-53

lntake Manifold
Replacement (cont'dl
NOTE: Use new O,rings and gaskets when reassembling.
CAUTION:
. Check lor folds or scratches on the surface of the gasket.. Replace with a new gasket il damaged.
D16Y8 engine:
INTAKE MANIFOLDReplace if cracked orif mating surfaces areoamageo,
INTAKE AIR CONTROL{ract vAt_vE {M/Tl
GASKETReplace.
8 x 1.25 mm24 N.m {2.{ kgtm.17 tbtftt
THROTTLEBODY
8 x 1.25 mm22 N.rn |.2.2 kgl.rn,16 tbtft)INTAKE MANIFOLDBRACKET
9-4

lllustrated Index
@@ system is under high pressure when theengine is hot. To avoid dangsr of rsleasing scaldingengine coolant, removo the cap only when the engine iscoot.
Total Cooling System Capacity flncluding heater andfoservoir (0.4 f (0.42 US qt, 0.35 tmp qt)ll:
*2: 81642 engine*3: D16Y7 engine*4: D16Y8 engine
CAUTION: lf any engine coolant spills on painted por-tions of the body, rinse it off immediately.
NOTE:
. Check all cooling system hoses for damage, leaks ordeterioration and replace if necessary.. Check all hose clamps and retighten if necessary.. Use new O-rings when reassembling.
RADIATOR CAPPressure test, page '10 86x1.0mm9.8 N.m {1.0 kgtm,7.2 tbt.ltl
UPPERRADIATORHOSE
UPPER BRACKETAND CUSHION
COOLANT
RAOIATOREngine coolant refilling and bleeding,page 10 7Leak test, page 10-9Inspect soldered joints andseams for leaks,Blow out dirt Irom betweencore fins with compressed air.lf insects, etc,, are cloggingradiator, wash them off withrow pressure water.
RESERVOIR
5x0.8mmA: ,1.4 N.m {0.45 kgf.m, 3.3 tbtftlg: 5.4 N.m (0.55 kgtm.4.0 tbf.ft)
6x1.0mm7.2 N.m (0.73 kgt.m,5.3 tbtftl
LOWERCUSHION
RADIATOR FANBADIATORFAN
DRAINPLUG
O-RINGReplace.
LOWEBRADIATORHOSE
FAN MOTOR SHROUD
Ar TOYO RADIATOR manufactured radiatorB: NIPPONDENSO manufacfared raoraror
10-2
Refer to section 14when installing.
Mt-|-4.2 f (4.4 US qt,3.7 tmp qt)*j
5.0 / (5.3 U$ q1, 4.4 16p q11*z
4.1 f (4.3 US qt, 3.6 lmp q0*3
4.31 (4.5 US qt, 3.8 tmp qt)*a
CVT4.3 f (4.5 US qt,3.8 Imp qt)
*1i D16Y5, D16Y7, D16Y8 engines
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