Thermostat HONDA INTEGRA 1998 4.G Workshop Manual

Cooling
lllustrated Index ........
Radiator
Replacement ..............
Engine Coolant Refilling and
Bleeding
Cap Testing
Pressure Testing
Thermostat
Replacement ..............
Testing
Water Pump
lllustrated Index .........
Inspection
Replacement ...............
10-2
10-5
10-6
10-8
10-8
10-9
10-9
10-10
10-11
10-11

lllustrated Index
\ENGINE COMPART MENT HOSE CONNECTIONS lconi'dl:
818C5 engine:
IDLE AIR CONTROLIIAC} VALVE
THERMOSTATHOUSING
\
\
O.RINGReplace.
\@
/
O-RINGFeplace.OIL COOLERBYPASS HOSESHEATERvAt_vE
COOLER

Thermostat
Replacement
NOTE: Use new gaskets and O-rings when reas'
sembling.
GROUNDTERMINAL
6 x 1.0 mm12 N.m {1.2 kgt.m,8.7 lbf.ft)
THERMOSTATInstall with pin up.O RINGReplace
ECT SWITCH27 N.m {2.8 kgf.m, 20 lbf.ftl
J
1.
Replace _thermostat if it as open at room temperature.
To test a closed thermostat:
Suspend the thermostat in a container of water as
shown.
Heat the water and check the temperature with a
thermometer. Check the temperature at which the
thermostat lirst opens and at full litt.
CAUTION: Do not let the ihermometer touch the
bottom of the hot container.
Measure the lilt height of the thermostat when it's
fully open.
STANDARD THERMOSTAT
Lift height: above 8.0 mm (O.31 inr
Stalts opening: 169- 1760 F (76-8OoC)
Fully open: 194o F l9OoCl
THERMOMETER
THERMOSTAT
2.
3.
10-g
. )

Water Pump
NOTE:
a Use new O-rings and new spgcial bolts when reassembling.
a Use liquid gasket, Part No. O8718 0001.
R;lll$ 818c1. 818c5 ensines:
ECT GAUGE SENDING UNITI N.m 10.9 kg{'m, 7 lbf'ftlApply liquid gasket
to the threads.
lllustrated lndex
6 x 1.0 mm11 N.m (1 .1 kgt.m.8.0 rbf.frt
ECT GAUGESENDING UNIT
818B1 engine:
OUTLET
ECT SWITCH27 N.m {2.8 kgf.m,20 lbf.fr)
ECT SENSOR
ENGINE COOLANTTEMPERATT,IRE IECTI SENSOR18 N'm (1.8 kgt.m, 13lbl'ft)
6 x 1.O mm11 N.m {1.1 kgI.m, 8.0 lbf.ft}
OUTLETCOVER
WATER PUMPInspecl|on,page 10-11
KNOCK SENSOR ADotv trouid oasket31 N.m 13.2 kgt.m, to ."t,nq .uif""".23 lbl.ftl
{818C1. 818C5 engines)
\,
O,RINGReplace.',O-RINGReplace.
6x1.0mm'12 N.m 11.2 kgt.m,8.7 lbI.fr)
THERMOSTAT HOUSINGASSEMBLY
O-RINGSReplace.
6 x 1.0 mm12 N.m (1.2 kgf.m, 8.7 lbI'ft)
COVER
10-10

I
I
It:
PGM-FI System
Engine Control Module {ECMI
,i
I
{
ili
NOTE: lf this svmotom is intermittent, check for a loose fuse No. 25 METER (7.5A) in the under_
dash fuse/relay box, a ooor connection at ECM terminal A18, or an intermittent open in the
GRN/ORN wire between the ECM (A18) and the gauge assembly.
Wire side of female terminals
I
The Mellunction Indicator Lamp(MlLl never com€3 on leven foltwo secondsl alter ignition islurn6d ON lll).
Turn the ignition switch ON (lli.
- Repair short or open in th€wire betwe€n No. 25 METER{7.5 A}fuse and gauge assem-bty.- ReDlaco No.25 METER 17.5 A)fuse.
ls the low oil pressure light on?
Try to start the engine,
Check for an open in ih6 wires
IPG lines):1. Turnthe ignition switch ON (ll).
2. Measure voltage betweenbody ground and ECM connec-tor terminals A10 and A23 indi-vidually.
Chock for an open in the wire orbulb:1. Turn the ignition sw;tch OFF.2. Connectthe ECM connector terminal 418 to body ground with
3. Turn the ignition switch ON (ll).
Repair open in the wire(slbetween ECM and G101 (located
at thermostat housingl that hadmore than 1.0 V.
ls there less than 1.0 V?
Substitute . known-good ECMand .echeck, lf symptom/indica-tion goes away, replace the origi-nalECM.
- R€pair open in the wiresb€tweon ECM {A18land gaug€
ess€mbly.- Replace the MIL bulb.
ls the MIL on?
Substitute a known-9ood ECMand rech6ck. It symptom/indica-tion goes away, repbce the origi-nal ECM.
ECM CONNECTOR A {32P)
15 16 17 18 19
r 2 3 al 15 Ga910 11
12 ,, t5 16 1tt920/22 23 2a
25 26 211184tt-MILJUMPER(GRN/ORN) I WIRE

PGM-FI System
Engine Coolant Temperature (ECTI Sensor
Ip01161 Ihe,scaltool indicates Diagnostic Trouble Code (DTC) P0116: A range/performance problem in the Engine: Coolant Temperature {ECT) Sensor circuit.
The ECT Sensor is a temperature dependant resistor (thermistor). The resistance of the thermistor decreases as the engine
coolant temperature increases as shown below.
RESISTANCEtkol
! 32 68 104 140 i 76 212 248 { "F)-20 o 20 'ra, qt Il rd' t20 r'c)
ENGINE COOLANT TEMP€RATURE
P01 16, troubleshoot those DTCS first, then trou-NOTE: lf DTC P0117 andlo( Po'l'18 are stored at the same time as DTC
bleshoot DTC P0'l16.
Possible Cause
. ECT sensor deterioration
. Malfunction in the thermostat and the cooling system
lroubleshooting Flowchart
I
1 1-60
THERMISTOR
- Th€ MIL has been reoorted on.- DTC P0116 is stored.
Problem veritication:1. Start lhe engine. Hold theengine at 3,000 rpm with noload (in Park or neutrall untilthe radiatorlan comes on, thenlet it idle.2. With the scan tool, check theECT,
Inlermittent failure, system is OKat this time. Chock tho thermostaland th€ cooling syst6m.
ls 176 - 200"F (80 - 93'C) or0.4-0.TVindicated?
Check the thermostat and thecooling system. It th€y ara OK,reolace the ECT sensor,

SYMPTOMREMEDY
Hot air tlow is low.Blower motor runs, but one or more
speeds are inoperative.
Follow the flowchart (see page 21-9).
Blower runs propetly.Check for the following:. Clogged heater duct
. Clogged heater outlet
. Incorrect door Position
No hot air tlowBlower motor does not run at all.Follow the flowchart {see page 21-11}
Blower motor runs.Check for the following:
. clogged heater duct
. Clogged blower outlet. Clogged heatet valve
. Faultv air mix door
. Heater valve cable adjustment lsee page 21-27].
. Air mix control cable adiustment {see page 21-27)
. Faulty thermostat (see section 10)
. Clogged evsporator (with air conditioning)
. Frozen evaDorator (with air conditioning)
Mode control motor does not run, or one or more mooes are
inoDeratave.
Follow the flowchart (see page 21-14).
Recirculation control door does not change between FRESH
and RECIRCULATE.
Follow the flowchart {see page 21-17).
Troubleshooting
Symptom Chart
NOTE: Check the engin€ coolant level and allow the engine to warm up before troubleshooting'
21-8
v

1i
II
Heater Control Panel Input/Output Signals
No.Wire ColorSignalNo.Wile ColorSignal
BLU/WHTHEATINPUT8GRN/YELHEAT/VENTINPUT
2YELHEATiDEFINPUTqRED/BLKCOMBINATION LIGHT SWICHINPUT
3YEL/BLUDEFINPUT10REDBRIGHTNESS CONTROLLEROUTPUT
BLKGROUNDOUTPUT11BLU/REDA/C THERMOSTATINPUT
5GRN/REDRECIRCULATEINPUTGRNHEATER FAN SWITCHOUTPUT
6GRN/WHTFRESHINPUT
7YEL/REDVENTINPUT14BLK/YELINPUT
21-19

JView from wire sideFrom page 22-16
i,:,
il
rlt'
8LK/YEL l+)
YEL/WHT {+}
View from wire side
BLU/FED
(cont'd)
Turn the ignition switch ON {ll).
Measure the voltago between theBLK/YEL wire terminal (+) andbody ground (-).
Reprir opon in th€ BLK/YEL wir€batween the under-d.sh tuse/relay box rnd the A/C therm6tlt.
ls there battery vohageT
Moasure tho voltage between theYEL,A/VHT wire terminal (+) andbody ground (-).
Repair op6n in the YEL/WHTwire betwGen the A/C pressure
switch snd the A/C thermostat.ls th6re battery voltage?
Turn the ignition switch OFF.
Reconnect the A,/C thermostat 3Pconnector and connect the BLU/RED wire terminal to ground with
Do the radiator and con-denser fans run and thecompressor clutch engage?
Turn the ignition switch OFF anddisconnect the jumper wire.
To page 22'18
22-17

Troubleshootang
A/C System (cont'd)
8
Ftom page 22-17
Disconnect the heater controlpanel 'l4P connector.
Turn the ignition switch ON (ll).
Measure the voltage between theBLU/RED wire terminal (+) andbody ground (-).
Ropair open in the BLU/RED wirebetween the A/C thermostat andthe heater control Danel,
Turn lhe ignition switch OFF.
ls the PVC switch OKI
Disconnect the heater fan switch6P connector.
Check lor continuity in the GBNwire between the heater controlpanel and the he6ter fan switch,
Repair open in the GRN wire be-tween the hester control panel
and the heater fan switch.
Check for continuity in the BLKwire between the heater fanswitch and body ground.
Check for an ooen in the BLKwire between the hetter fanswitch and body ground. ll rhewire is OK, check for poorground at G401 and G402.
ls there continuity?
Reolace the heater fan switch.
Remove the heater control panel(see page 21-25).No.'11 BLU/RED {+)
View from wire side
View from wire side
22-1