1998 HONDA INTEGRA heater

ldle Control System
ldle Speed Setting (cont'dl
ldle the engine for one minute with headlights (Low)
ON and check the idle speed.
ldle 3peed should b€;
B1881 engine:
MIT750 t 50 rpm
750 i 50 rDm (in Park or neutrall
818C1 engine: 7501 50 nm
818C5 engine: 8001 50 rpm
Turn the headlights off. ldle the engine for one min-
ute with heater fan switch at Hl and air conditioner
on, then check the idle speed.
ldl. spood should be;
Bl8Bl ongin.:
M/T820 i 50 rpm
lvT840 t 50 rpm (in Park or neutral)
818C1 €ngino: 850 i 50 rpm
818C5 engino: 1,050 t 50 rpm
NOTE: lf the idle speed is not within specification.
see Symptom Chart on page 1!-36.
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| 11-112
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Emission Gontrol System
System Description
Three Way Catalytic Converter (TWCI
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The emission control system includes a Three Way
Catalytic Converter (TWC), Positive Crankcase Ventilation
(PCV) system and Evaporative Emission (EVAP) Control
system. The emission control system is designed to meet
tederal and state emission standards.
InsDeciion
!@@ Do not smoke during this procedure. Keep
any open llame away from your work area.
1. Start the engine. Hold the engine at 3,000 rpm with
no load {in Park or neutral) until the radiator fan
comes on, then let it idle.
2. Connect a tachometer.
Check and adjust the idle speed, if necessary (see
page '11-11 ! ).
Warm up and calibrate the CO meter according to the
meter manufacturer's instructions.
Check idle CO with rhe headlights, heater blower,
rear window defogger, cooling fan, and air condition-
er off.
NOTE: {Canada) Pull the parking brake lever up.
Start the engine, then check that the headlights are
olf.
CO meter should indicste 0.17o maximum.
DescriDtion
The Three Way Catalytic Converter {TWC) is used to convert hydrocarbons (HC), carbon monoxide (CO), and oxides of
nitrogen (NOx) in the exhaust gas, to carbon dioxide (COr), dinitrogen {Nr) and water vapor.
Bl8Cl engine l818Bl, 818C5 engines is similar):
FRONT OFVEHICLE
PRIMAEYHEATEDOXYGEN SENSORIPRIMARY HO2S}
HOUSING
WAYCATALYSTS
SECONOARYHEATEDOXYGEN SENSOR{SECONDARYH02St
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Three Way Catalytic Converter (TWC)
lT042O I Th" """n tool indicates Diagnostic Trouble Code (DTC) P0420: catatyst system efficiency below threshold.
Descriotion
This system evaluates the catalyst's capacity by means of the HO2S (Primary and Secondary) output during stable drivingconditions. lf deterioration has been detected during three consecutive driving cycles, the MIL comes on and DTC p0420 willbe stored.
NOTE: lf some of the DTCS listed below are stored at the same time as DTC PO42O. troubleshoot those DTCS tirst. thentroubleshoot DTC P0420.
P0136, P0139: Secondarv HO2S
P0141:Secondary HO2S Heater
Possible Cause
. TWC Deterioration
. Exhaust system leakage
Troubleshooting Flowchart
Problem verification:1. Do the ECM Reset Procedure.2. Start the engine. Hold theengine at 3,000 rpm with noload (in Park or neutral) untilthe radiator fan comes on,3. Connect the SCS service con,
4. Test drive 40 - 55 mph (64 -
88 km/h) for approx. two min-utes, Then decelerate Ior atleast 3 seconds with the throttle completely closed. Thenreduce the vehicle speed to35 mph (56 km/h), and try tohold it until the readinesscode comes on.
I
- The MIL has been report€d on.- OTC P0420 is stored.
Intermittent tailure, sFtem is OKat this time.ls DTC P0420 indicated?
Check the TWC {s6e 3ection 91.lf necessary, reolace the TWC.
11-139

Dashboard
Component Removal/lnstallation (cont'dl
5. Remove the knee bolster.


: Bolt
A'ir
locations,3
6 x 1.0 mm9.8 N.m
{1.0 kgt m,7.2 tbf.fit
0
6. lnstallation is the reverse o{ the removal procedure.
Ste.eo ladio/cassette, Heatet contlol Danel removal:
1. Remove the rear console, then remove the front
console (see page 20-130).
Loosen the bolts, then remove the stereo radio/
cassette by pulling it out.
Disconnect the connector and antenna lead.
NOTEr The original radio has a coded theft protec-
tion circuit. Be sure to get the customer's code num-
ber before- disconnecting the battery.- removing the No. 47 (7.5 A) tuse from the under-
hood fuse/relay box.- removing the radio,
After service, reconnect power to the radio and turn
it on. When the word "CODE" is displayed, enter
the customer's 5-digit code to restore radio
ope.ation.
KNEE BOLSTER
20-134
CONNECTOR
CASSETTE


: Bolt locations, 2
6x1.0mm9.8 N.m {1.0 kgt m,
3. Carefully pry the hazard warning switch and rear
window detogger switch out of the heater control
panel.
Disconnect the connectors.
HAZARD WARNINGswtTcHREAR WINDOWDEFOGGER SWITCH
CONNECTORS

4. Remove the screws.
Detach the harness clip and connector clip.
> : Screw locations, 2
CONNECTOR CLIP
5.Disconnect the air mix control cable from the heat-
er unit.
AIR MIX CONTROLCABLE
CONNECTORS
6.Pull the heater control panel out, then disconnect the
connectors.
NOTEr Take care not to bend the air mix control
ca ote.
HEATERCONTROLPANEL
7. Installation is the reverse of the removal procedure.
NOTE: Make sure the connector and air mix con-
trol cable are connected properly.
(cont'd)
20-135

Replacement
1. To remove the dashboard, tirst remove the:
a Front seats {see page 20-'103)
a Front and rear consoles (see page 20-130)
a Oashboard lower cover {see page 20-133)
a Knee bolster (see page 20-134)
. Glove box (see page 20-137). Clock (see page 20-1371
. Moonroof switch (see page 20-136)
a Stereo radio/cassette (see page 20-134)
2. Lower the steering column (see section 17).
NOTE: To prevent damage to the steering column,
wrap it with a shop towel.
l ; Boh, nut locations
AA : Bolr, 28

: Nut, 2
8 x 1.25 mm22 N.m 12.2 kgl.n,16 tbf.ft)o21 13 N m 11.3 kgl m,
\€J' Prbl rll
_Urr'rr,t __)
STEERING JOINTCOVER
STEERING COLUMN
3. Remove the nuts, then remove the front passenger's
airbag bracket.


: Nut locations, 4
6 x 1.0 mm L9.8Nm
{1.o kgt m,7.2tbt.rrUFRONT PASSENGEB'SAIRBAG
PASSENGER'S
SRS MAINAIRBAG BRACKET
HARNESS
4. Disconnect the air mix control cable and connectors.
AIR MIX CONTROLCABLE
HEATERCONTROLPANELCONNECTORS
(cont'd)
20-139

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Heater
fffustrated Index ............. ......'..21-2
Heater Door Positions '....'........ 21-3
Circuit Diagram ....................... 21-6
Troubleshooting
Symptom Chart ............. '.....21-8
Flowcharts
Blower Motor Speed ...............'......'........ 21 -9
Blower Motor ............'......21-11
Mode Controf Motor ............ ............'... "' 21 -14
Recirculation Control Motor ......'...... "'.,.,. 21 -1 7
Heater Control Panel Input/
Output Signals ...'.......... 21-19
Blower Unit
Replacement ........ '....... ',..,.. 21-2O
Overhaul ",',..21-21
*Heater Unit
Repf acement .....'.....'........'.. 21'22
Overhaul .......21-24
Heater Control Panel
Repfacement ....... '..... '......... 21-25
Overhaul .......21-26
Heater Valve Cable
Adjustment '.. 21'27
Air Mix Control Cable
Adiustment ... 21-27
Mode Control Motor
Test .............. ..................... 21'24
Repfacement ....................... 21-24
Recirculation Control Motor
Test .............. ..................... 21-29
Repf acement .........'........ " ". 21-29
Relay
Test .............. ..................... 21-3O
Heater Fan Switch
Test .............. ....................' 21-30
Mode Control Switch
Test .............' "'..............'... 21-31
Recirculation Control Switch
Test .............. ..................... 21-31
*: Read SRS precautions before working in this area.

lllustrated Index
SRS components are located in this area. Review the SRS component locations. precautions, and procedures in the SRSsection (23) before performing repairs or service.
BLOWER UNITReplacement, page 21-2OOverhaul, page 21.21
HEATER VALVE CABLEAdiustment, page 21-27
HEATER UNITReplacement, page 21-22Overhaul, page 21-24RECIRCULATION CONTROL MOTORIest, page 21,29Seplacement, page 21-29
BLOWER RESISTORTest, page 21-9
AIR MIX CONTROLCABLEAdjustment, page 21-27Replacement, page 21-26
A/C SWTTCH{with A/clTest, page 22-20
RECIRCULATIONCONTROL SWITCHTest, page 21,31
HEATER FANswrTcHTest, page 21-30
MODE CONTROL MOTORTest, page 21-28Replacement, page 2 l -28CONTROL SWITCHTest, page 21-3'l
HEATER CONTROL PANELReplacement, page 21,25Overhaul, page 21-26
TEMPERATURE CONTROLLEVERlAdjustment: Soe AIR MIXCONTROL CABLEI
21-2