coolant temperature HONDA INTEGRA 1998 4.G Owner's Manual

Electrical Troubleshooting
Troubleshooting Flowchart - Engine Coolant Temperature
(EGTISensor
Polribl. Cluta
. Dirconnoct.d Engin. CoollntTampaolur€ IECTI aanaor con.noctot. Short or opcn In ECT..n.or
. F.ulty ECT r.n.or
Tctrrt oot{NEcToRs
WIRE SIDE OF FEMAII TERi'IINAIS
U
{
M6esur. ECT Voh.ge:1. Turn the ignition switch OFF.2. Connect the A (26P) andB (22P) connectors to the TCM.3. Start the engine and w6rm ituP to normal operating tem-pe ratu re (the radiator fancomes on),4, Measure the voltage betweenthe 83 and A13 or A26 termi-nats.
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:
rt.fls there less than 1 V?
Ch.cl fo. looso TCM connac{or3,t nacaasary, substituto a known"good TCM rnd r.chock.
' OBD ll Scsn Tool Indicat6 CodeP1792.. Sett'diagno3i3 E indicatollight indicates Code 10.
Chock tor Anothor Codo or MILBlinking:1. Turn the ignition switch ON (ll).
2. Check wh€ther rhe OBD llscan tool indicates anothercode or the Malfunction Indi-cator Lamp (MlL) blinks (see
section 11).
Does the OBD ll scan tool indi-cate another code or is theMIL blinking?
Moasure VREF Voh.go:1. Turn the ignition switch OFF.2. Disconnect the A {26P) andB (22P) conneotors from theTCM.3. Turn the ignition switch ON (ll).
4. Measu.e the voltage betweenthe 820 and A13 or A26 tormi-nals.
Bap|ir open or thort in tha wircb.two.r th. B:m t.rminll .nd thoECM.
ls there approx. 5 V?
napalr opln in iha wlra brtwaanthe lB t.rminrl lnd th. ECT r.n-ao1.

Electrical Troubleshootin g
Troubleshooting Flowchart - LC Control System
\.r.Poeribl. C.ua.
control
NOTE: Do not continue with this troubleshootingot any other DTCS have beeo corrected.until thg caus€s
v
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14-80
Chock lor Anothor Cod6:Check whether the OBD lltool indicates another codo.
P6rform tha TroublorhootingFlowcha for tho indicrladCodolsl.R.ch.ck fof codo P0740 !ft.tt.oublo3hooting.
Does the OBD ll scan tool indi-cate another code?
Tost Line Proisurg:Measure the line pressure (see
pag6 14-98).
R.prir tho hydraulic syltcm !!n.cGsary (soc pago 1+98).ls the line prsssure within theservic€ limit?
Repl!c6 th6 Lock-up ControlSolenoid Velva As3ambly .ndRschock:1. Replace the lock-up controlsolenoid valve y'y'B assembly(see page '!4-87).
2. Turn the ignition switch OFFand reset the TCM memoryby removing the BACK UPfuse in the und€r-hood fuse/rolay box tor more than 10seconos.3. Using the OBD ll scan tool,check that the engine coolanttemperatures is 176'F (80'C)
4. Drive the vehicle at 55 mph(88 km/h) constantly lor rnorethan one mrnute,5. Recheck for code P0740.
Does the OBD ll scan tool indi-cate codo P0740?Tha iy3t6m ir OK .t thi! timc.
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Troubleshooting
Engine Coolant Temperature(ECT}Switch
Both fans (radiator and con-denserl do not run for enginecooling, but they both run withthe A,/c on.
Disconnect the engine coolanttemperature lECT) switch 2P con
Turn the ignirion switch ON ( ll).
Measure the voltage between theGRN wire terminal (+) and bodyground (-)-
Repair open in the GRN wire b€-tween the ECT switch and theunder-hood luse/rel6v box,ls there battery voltageT
Turn the ignition switch OFF andcheck for continuity in the BLKwire between the ECT switch andbody ground.
Check for en ooen in the BLKwire between the ECT switchand body ground. ll th. wire isOK, check lor poor ground atG101.
ls there continuity?
Check the temperature gauge.
Does it read above normal?
View from wire side
GRN (+)

Connector ldentification and Wire Harness Routing
Connectot or
Terminal
Numbel of
CavitiesLocationConnects toNotes
c'to 1
c102
c103
c'1 04
c105
c106
c 107
c108
c108
c109
c110
c112
c113
c'r 14
c115
c116
c117
c118
ct'l9
c119
c120
c121
c122
c124
c't 26
c127
c128
c129
c130
c111
4
10
14
6
I
1
2
2
10
2
3
2
J
4
3
3
2
2
I
3
2
2
2
2
2
I
2
14
Right side of engine compartment
Right side of engine compartment
Right side ot engine compartment
Right side of engine compartment
Right side oI engine compartment
Right side of engine
Right side of engine
Transmission
Transmission
Middle ot engine
Middle ot engine
Right side of engine
Right side of engine compartment
Middle rear of engine compartment
N4iddle of engine
N4iddle ol engine
Middle oI engine
Nliddle ot engine
Middle of engine
Lelt side of engine
Left side of engine
Middle of engine
Middle oI engine
Middle of engine
Middle of engine
Middle ot engine
Left side of engine compartment
Lelt side ot engine compartment
Left side of engine compartment
Transmission
Transmission
Transmission
Main wire harness (C221)
Main wire harness (C222)
Main wire harness 1C223)
lvlain wire harness (C220)
Starter solenoid
Engine coolant temperature (ECT)
sensor
Engine coolant temperature (ECT)
gauge sending unit
Back-up light switch
Lock-up control solenoid valve A and B
Distributor
Crankshatt speed fluctuation (CKF)
sensor
Engine coolant temperature (ECT)
switch
Vehicle speed sensor (VSS)
Primary HO2S
MAP sensor
Throttle position (TP) sensor
ldle air control (lAC) valve
EVAP purge control solenoid valve
Engine oil pressure switch
Alternator
Alternator
lntake air temperature (lAT) sensor
No. 1 fuel injector
No. 2 fuel injector
No. 3 fuel injector
No. 4 fu€l injector
Junction connector
Engine compartment wire harness
(c304)
Engine compartment wire harness
(c30s)
Shift control solenoid valve A and B
Countershaft speed sensor
lvlainshaft speed sensor
M/T
NT
USA
Canada
Afi
Afi
T101
T102
Left side oI engine
Right side of engine compartment
Alternator
Under hood fuse/relay box
G'1 01Right side oI engineEngine ground. via engine wire
harness
Engine Wire Harness (B188l enginel
23-16

Connector ldentification and Wire Harness Routing
Engine Wire Harness (B18Cl enginel
Connectol ol
Terminal
Number of
CavitiesLocationConnects toNotes
c 101
c102
c103
c104
c105
c106
c101
c108
cr09
c110
c'r 11
cl12
c1't3
c114
c115
c116
cl17
c118
c119
c119
c120
cI2'l
cl24
c126
c127
cl31
c132
c133
c134
10
14
3
1
2
1
2
10
2
'I
3
2
2
2
I
1
2
2
?
3
2
14
Right side of engine compartment
Right side of engine compartment
Right side of engine compartment
Right side ol engine compartment
Right side of engine compartment
Righr side oI engine
Right side of engine
Transmission
Middle of engine
Middle of engine
Right side of engine
Right side of engine compartment
Middle rear of engine compartment
Middle of engine
Middle of engine
Middle of engine
Middle of engine
i/iddle of engine
Left side ot engine
Lelt side ot engine
Middle ot engine
Middle of engine
Middle of engine
Middle of engine
Middle of engine
Left side of engine companment
Left side of engine compartment
Lelt side of engine compartment
Right side of engine
Right side of engine
Middle of engine
Middle of engine
lvlain wire harness (C221 )
Main wire harness {C222)
Main wire harness (C223)
Main wire harness (C220)
Starter solenoid
Engine coolant temperature (ECT)
sensor
Engine coolant temperature (ECT)
gauge sending unit
Back-up light switch
Distributor
Crankshalt speed fluctuation (CKFI
sensor
Engine coolant temperature {ECT)
switch
Vehicle speed sensor (VSS)
Primary HO2S
MAP sensor
Throttle position {TP) sensor
ldle air control (lAC) valve
EVAP purge control solenoid valve
Engine oil pressure switch
Alternator
Alternator
Intake air temperature llAT) sensor
No. 1 fuel injector
No. 2 fuel injector
No. 3 tuel injector
No. 4 tuel injector
Junctron connector
Engine compartment wire harness(c304)
Engine companment wire harness(c30s)
VTEC solenoid valve
VTEC oil pressure switch
Knock sensor (KS)
Intake air bypass {lAB) control sole-
noid valve
USA
Canada
T101
r 102
Left side ot engine
Right side of engine compartment
Alternator
Under-hood fuse/relay box
G 101Right side of engineEngine ground, via engine wire
naaness
23-18

)
Fan Motor Test
Disconnect the 2P connector from the fan motor.
Test the motor by connecting battery power to the
B terminal, and ground to the A termlnal.
lf the fan motor fails to run smoothly, replace it.
NOTE: The illustration shows the radiator fan.
Radiator Fan Switch Test
NOTE: Bleed air from the cooling system after installing
the radiator fan switch (see section 10)
1. Remove the radiator fan switch from the thermostat
housing.
2. Suspend the radiator fan switch in a container ol
coolanl as shown.
Heat the coolant and check engine coolant tempera
ture with a thermometer.
Check the continuity between the A and B terminals
according to the table:
23-119
Te rm Inal
Operatlon -------\
Tcmoerature ------
ON196. -203'F
(91" 95'C)
-5" 14.F i3" _8"C) ;*,*
than the temperature when
rt goes on.
SWITCH
OFF
B
-o
.-

Gauge/lndicator/Terminal Location Index
coNNECTOR "8" (C5601
ltrii
rll
coNNECTOR "C" (Css8l
ACHOMETER:rdicates 10O rpm al
OO pulses per minutef the ignition controlrodule {lCM).
81 ------------ 816
ililllllilll
A,/T GEAR POS]TIONINDICATOR SYSTEMS€e page 23-140
c1 ------>cl0
I
Jilliltl
atespage 23-131t Test, page 23-132
^a1(
u;" u
7' /'- /n.u (,w.--
" oe)\r- -7 ttt'-1 r --
I 'l I z{.-a\y' | \-./^l
!t tr--',9I I l\-//11, I t,-\Jl
.r' to"-ei
I :rl
F<
elrle
ENGINE COOLANT TEMPERATUREGauge T€st, page 23-134Sending Unit Test, page 23'134
IECTI GAUGE:
A1 ----> A5
D1-------->D13
ililtl|illl
SPEEOOMETER:lndicates (60 mph at 1025 rpm) or
{60 km/h at 637 rpm) of the
vehicle speed sensor {VSS).
coNNECTOR "A" (C557)
coNNECTOR "D" (C5591
23-121

{
Disassembly
NOTE: Handle the terminals and Drinted circuit boards carelully to avoid damaging them.
FUEL GAUGEMOUNTING SCBEW {x 3l
e
o
SPEEDOMETER MOUNTING SCREW (x 4)ENGINE COOLANTTEMPERATURE {ECT)GAUGEMOUNTING SCREW {x 3}
t)ENGINE COOLANTTEMPERATURE IECTIGAUGE UNITTest, page 23-134TACHOMETEF UNITSpecification, page 23-121
SRS PRINTEDCIRCUIT BOARD
d'dP
METER HOUSTNG
FUEL GUAGE UNITTest, page 23 131
'
/*'
r@/ ror
6rH"
SPEEDO/ODO/TRIP METER UNTT' SPEEDOMETERSpecification, page 23-121Troubleshooting, Page 23_128. ODOMETERTroubleshooting, page 23-128. TRIP METERTroubleshooting, Page 23 128
TACHOMETER MOUNTING SCREW {x 3)
PRINTED CIRCUIT BOARD
It
23-127

Engine Coolant Temperature (ECT) Gauge
Gauge Test
NOTE: Refer to page 23-123 for the wiring description of
the engine coolant temperature (ECT) gauge circuit dia-
gram.
1. Check the No. 25 (7.5 A) fuse in the under-dash
fuse/relay box before testing.
2. Make sure the ignition switch is OFF, then discon-
nect the YEL/GRN wire trom the ECT gauge send-
ing unit and ground it with a jumper wire.
YEL/GRN WIRESENDING UNIT
Turn the ignition switch ON (ll).
Check that the pointer of the ECT gauge starts mov-
ing toward the "H" mark.
CAUTION: Turn the ignition switch OFF before the
pointer reaches "H" on the gauge dial. Failure to do
so may damage the gauge.
a lf the pointer of the gauge does not move at all,
check lor an open in the YEL or YEL/GRN wire.
lf the wires are OK, replace the ECT gauge.
a lf the ECT gauge works, test the ECT sending
unrt.
ECT Sending Unit Test
Disconnect the YEL/GRN wire from the ECT send-
ing unit.
With the engine cold, use an ohmmeter to measure
resistance between the positive terminal and the en-
gine (ground).
Check the temperature ol the coolant.
Run the engine and measure the change in resistance
with the engine at operating temperature (the radi-
ator fan comes on).
5. It the obtained readings are substantially different
from the sDecifications above, replace the ECT send-
Ing unrt.
POSITIVE TERMINAL
Temperature133oF (56oC)1850F (85.C)-
212.F (100'C)
Resistance {O)13746-30
23-134

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Contents
How to Use This l\.4anual 1Circuit Schematics (see Circuit Index)Fuse/Relaylnformation 6ComponentLocation Photographs 201
Connector Cavity Numbers 202Connectorldentification 203
Ground-to-Components Index 6-6Wire Harness Routing 203Circuit ldentification lor ln-Line and Fuse Box Connectors
Circuit Index
Air conditionerAir delivery 61Blower controls 60Compressor controls 62Fans 63Anti-lock brake system (ABS) 44A/T gear position indicator 89Automatic transmission controls'98199 models 39'00 models 39-4Back-up lightsHatchback 110Sedan 110- 1Brake system indicator light
USA 71Canada 71-1Brake lightsHatchback 110-6Sedan 110-7Cargo area light (Hatchback) 114-3Ceiling light 114-2Charging system 22Cigarette lighter 155
Clock 154Condenser fan 63Console lights 114Cruise control 34Dash lights 1 14Daytime running lights 110-8Door open indicator 114-2Engine coolant temperature gauge 81Engine oil pressure indicator light 72Fog lights 110-14Front parking lights 110-11Front side marker lights 110-11Fuel gauge 81Fuse/relay boxUnder-dash 6Under-hood 6-3Under-hood ABS 6-5Gauges 81Glove box light 114Ground distribution 14Ground-to-Componentsindex 6-6Hatch open indicator '114-3
Hatch opener '134
Hazard warning lightsHatchback 'l l0-2Sedan 110-4Headlights 1'10-8Headlight switch 100HeaterAir delivery 61Blower controls 60Fanswith A,/C 63without A,/C 63-2Horns 40lgnilion key reminder 73lgnition system 20
204
lmmobilizer system ('00 model) 132lndicators 80Integrated control unit 70Interlock system'98199 models 138'00 models 138-1License plate lightsHatchback 110-12Sedan 110-13Lights-on reminder 73Low fuel indicator light 74l\,4aintenance reminder light 83l\iloonroof 122Odometer 81-1Power antenna 151Power distributionBattery to ignilion switch, fuses, and relays
Fuses to relays and components 10-2Power door locksHatchback '130
Sedan 130-2Power mirrorsHatchback 141Sedan 141-1Power windowsHatchback 120Sedan 120-2Programmed fuel injection system (PGM-Fl)'98199 models 23'00 models 24Radiator fanwith tuC 63without A,/C 63-2Rear parking lightsHatchback 110-12Sedan 110- 13Rear window defogger 64Seat belt reminder 73Security system 133Speedometer Il-1Spotlights 114-2Starting syslemAutomalictransmission 21l\.4anualtransmission 21-1Stereo sound system 150Supplemental restraint system (SRS) 47Tachometer 81- 1TaillightsHatchback 110-12Sedan 110-13Trailer lighting conneclor 118Trunk lid open indicator 114-3Trunk light (Sedan) 114-3Turn signal lightsHatchback 110-2Sedan 110-4Vehicle speed sensor (VSS) 33Wiper/washerFront 91Rear 92
10
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