sensor ACURA NSX 1997 Service Manual Online

TCS Switc h Inspectio n
Electronic Component s
Between termina l No . 4 an d No . 5
(Illuminatio n ligh t circuit )
Ther e shoul d b e continuity .
Betwee n termina l No . 1 an d No . 2
(Switc h circuit )
Ther e shoul d b e continuit y whe n th e switc h i s pushed ,
an d ther e shoul d b e n o continuit y whe n th e switc h i s
released .
Lateral Acceleratio n (Lg ) Senso r
Inspectio n
CAUTION : B e carefu l no t t o dro p o r bum p th e L g sensor ,
an d don' t remov e o r instal l i t wit h a n impac t wrench ;
th e L g senso r ma y b e damaged .
1 . Remov e th e rea r cente r tri m pane l (se e sectio n 20 ).
2 . Remov e th e L g senso r fro m th e bracket .
3 . Tur n th e ignitio n switc h O N (II) .
4 . Measur e th e voltag e betwee n termina l No . 1 an d
No . 2 wit h th e connecto r connected .
• Ther e shoul d b e approx . 2. 5 V whe n th e L g senso r
i s vertical .
• Ther e shoul d b e approx . 1. 5 V whe n th e L g senso r
i s horizonta l wit h th e connecto r sid e facin g up .
• Ther e shoul d b e approx . 3. 5 V whe n th e L g senso r
i s horizonta l wit h th e connecto r sid e facin g down .
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Steering Angl e Senso r Replacemen t
Electronic Component s
Removal
1. Remov e th e steerin g colum n covers . Installatio
n
1 . Instal l th e steerin g angl e senso r b y tightenin g tw o
bolts , an d mak e sur e th e adjustin g shim s ar e installe d
properly .
CAUTION : D o no t appl y an y greas e o r oi l t o th e
adjustin g shim .
2 . Connec t th e 5 P connecto r t o th e steerin g angl e sensor .
3 . Instal l th e steerin g colum n covers .
4 . Perfor m th e steerin g angl e senso r syste m chec k
(se e page 19-125 ).
NOTE :
• Ther e is n o nee d to selec t (replace ) th e shim s whe n
th e steerin g angl e senso r i s replaced . Us e th e origi -
na l shims .
• Selectio n (Replacement ) o f th e adjustin g shim s
(fo r adjustin g th e ai r gap ) i s require d onl y whe n
th e steerin g colum n assembl y (withou t th e sen -
sor ) i s replaced .
2
. Disconnec t th e 5 P connecto r fro m th e steerin g angl e
sensor .
3. Remov e th e steerin g angl e senso r mountin g bolt s
an d washers , the n remov e th e steerin g angl e sensor .
NOTE : D o no t los e th e adjustin g shim s use d
betwee n th e steerin g angl e senso r an d senso r
mountin g bracket .
CAUTION : D o no t damag e o r dro p th e steerin g angl e
senso r a s it i s sensitive .
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Front Bumper

Replacement

1. Loosen the mounting screw, then pull the right and left front turn signal lights out and disconnect the connectors.

2. Remove the skirt covers, then remove the bumper mounting bolts on each side, and lower skirt mounting bolt.

3. Lower the inner fender, then remove the bumper mounting nuts and the skirt mounting bolts from inside the front

fender on each side.

4. Lift and remove the front bumper.

NOTE:

• Disconnect the washer hose, horn connecters, and ambient sensor connector.

• An assistant is helpful when removing the front bumper.

• Take care not to scratch the front bumper.

5. Installation is the reverse of the removal procedure.

NOTE: Insert the bumper bracket hooks into the bumper bracket holes.ProCarManuals.com

MODE CONTRO L MOTO R
Replacement , pag e 22-5 7
Test , pag e 22-5 8
EVAPORATO RTEMPERATUR ESENSORRemoval , pag e 22-6 5
Test , pag e 22-6 5 SUNLIGH
T SENSO R
Removal , pag e 22-6 3
Test , pag e 22-6 3
CLIMAT E CONTRO L UNI T
Replacement , pag e 22-5 4
Adjustment , pag e 22-5 5COMPRESSO R (NIPPONDENSO )
Compresse s th e refrigeran t an d
the n force s i t throug h th e condenser .
"DEF " DOO R
Adjustment , pag e 22-7 7"HEAT " DOO RAdjustment , pag e 22-7 7
BLOWE R UNI T
Replacement , pag e 22-6 7
Overhaul , pag e 22-6 8
RECEIVER/DRYE RServes a s a reservoi r whic h filter s an dremove s moistur e fro m th e refrigerant .
IN-CAR TEMPERATUR E SENSO R
Removal , pag e 22-6 1
Test , pag e 22-6 1
HEATER-EVAPORATO R
UNITReplacement , pag e 22-7 4
Overhaul , pag e 22-7 6
OUTSID E AI R TEMPERATUR E SENSO R
Removal , pag e 22-6 2
Test, pag e 22-6 2DUAL CONDENSE RDissipates th e hea t whic h wa sabsorbe d b y th e refrigerant .
Replacement , pag e 22-7 9
Overhaul , pag e 22-8 0
HEATE R COR E
TEMPERATUR E SENSO R
Removal , pag e 22-6 4
Test, pag e 22-6 4
AIR MI X CONTRO L
MOTO R
Replacement , pag e 22-5 6
Test , pag e 22-5 7
RECIRCULATIO
N
CONTRO L MOTO R
Replacement , pag e 22-5 9
Test , pag e 22-5 9 HEATE
R VALV E CABL E
Adjustment , pag e 22-58 , 22-7 5
VENT DOO R CONTRO L
MOTO R
Replacement , pag e 22-6 0Test, pag e 22-6 0
A/C TRIPL EPRESSUR E SWITC H
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Description

Fan Control Unit

The fan control unit performs calculations based on signals from the radiator fan control sensor. It them controls the

operation of radiator fan speed (High-Low), engine compartment fan, condenser fan and A/C compressor.

When engine coolant temperature is above 183°F

(84°C), the fan control unit turns Tr1 ON and

radiator fan runs at low speed.

When engine coolant temperature is above 194°F

(90°C), the fan control unit turns Tr2 ON, and

radiator fan runs at high speed and engine

compartment fan comes on.

When engine coolant temperature is above 266°F

(130°C), the fan control unit turns Tr3 OFF, and

stops the condenser fan. Then it turns Tr4 OFF,

and stops the compressor.

IG2

RADIATOR FAN (Low)

RADIATOR

FAN CONTROL

SENSOR
RADIATOR FAN (High)

ENGINE COMPARTMENT

FAN

CONDENSER FAN

(Right and Left)

ECM
(ACS)

A/C

TRIPLE

PRESSURE

SWITCH

GND
A/C SWITCHProCarManuals.com

SRS component s ar e locate d in thi s area . Revie w th e SR S componen t locations , precautions , an d procedure s in th e SR S
sectio n 24 befor e performin g repair s o r service .
UNDER-HOO D RELA Y BO X BBLOWE R MOTO R RELA Y
BLOWE R MOTO R HIG H RELA Y
COMPRESSO R CLUTC H RELA Y
POWER TRANSISTO R
BLOWE R MOTO R
RECIRCULATIO N
CONTRO L
MOTO R
CONDENSE R
FA N MOTO R UNDER-HOO
D RELA Y BO X A
(CONDENSE R FA N RELAY )
HEATER COR E TEMPERATUR E SENSO R
CLIMAT E CONTRO L UNI T VEN
T DOO R
CONTRO L MOTO R
OUTSID E AI RTEMPERATUR E SENSO R
A/C TRIPL E PRESSUR E SWITC H
ENGIN E COMPARTMEN T
FUSE/RELA Y BO X
FAN CONTRO L UNI T(Fan radiato r an d con -
dense r fan s insid e th e
vehicle , behin d seats )
EVAPORATO RTEMPERATUR E
SENSO R
MOD E CONTRO L
MOTO R
IN-CA R
TEMPERATUR E
SENSO R AI
R MI X CONTRO L MOTO R
UNDER-HOO
D
FUSE/RELAYBOX
SUNLIGH TSENSOR
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In-car Temperatur e Senso r
Remova l
The in-ca r temperatur e senso r assembl y include s a
smal l fa n (aspirato r fan ) t o dra w ai r pas t th e senso r (se e
pag e 22-66 ).
SR S component s ar e locate d in thi s area . Revie w th e SR S
componen t locations , precautions , an d procedure s in th e
SR S sectio n 24 befor e performin g repair s o r service .
1 . Remov e th e cente r consol e pane l (se e pag e 22-54 ).
2 . Remov e th e tw o screw s an d th e in-ca r temperatur e
senso r fro m th e unde r sid e o f th e cente r consol e
panel . B e carefu l no t t o damag e th e cente r consol e
panel.
IN-CA R TEMPERATUR ESENSOR
UNDER SID E O F CENTE R
CONSOL E PANE L
Test
Compar e th e resistanc e readin g betwee n th e No . 1 an d
No. 2 terminal s o f th e in-ca r temperatur e senso r wit h
specification s show n i n th e followin g graph : I t shoul d
be withi n specification .
CAUTION: Th e senso r use s a thermisto r whic h ca n
b e damage d if hig h curren t i s applie d to it durin g test -
ing . Therefore , us e a circui t teste r tha t put s ou t a
measurin g curren t o f 1 m A o r less .
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Outside Air Temperature Sensor

Removal

Remove the screw, disconnect the connector, and

remove the outside air temperature sensor. Be careful

not to damage the front grille and front bumper.

OUTSIDE AIR

TEMPERATURE

SENSOR
Test

Compare the resistance reading between the terminals

of the outside air temperature sensor with specifica-

tions shown in the following graph: It should be within

specification.

NOTE: Dip the sensor in ice water, and measure the

resistance. Then pour hot water on the sensor, and

check for change in resistance.

CAUTION: The sensor uses a thermistor which

can be damaged if high current is applied to it dur-

ing testing. Therefore, use a circuit tester that puts

out a measuring current of 1 mA or less.ProCarManuals.com

Sunlight Sensor

Removal

Protect the dashboard with a shop towel, then with a

small screwdriver, carefully pry the sunlight sensor out

of the dashboard and disconnect its connector.

SUNLIGHT

SENSOR
Test

Measure the voltage between the terminals with the sen-

sor out of direct sunlight.

• With the connector connected (probe the back of it):

1.4 ± 0.2 V

• With the connector disconnected: 0.1 - 0.2 VProCarManuals.com

Heater Core Temperature Sensor

Removal

Disconnect the connector, remove the clamp and the

heater core temperature sensor.

CLAMP

HEATER CORE

TEMPERATURE

SENSOR
Compare the resistance reading between the terminals

of the heater core temperature sensor with specifica-

tions shown in the following graph: It should be within

specification.

NOTE: Dip the sensor in ice water, and measure the

resistance. Then pour hot water on the sensor, and

check for change in resistance.
Test

CAUTION: The sensor uses a thermistor which

can be damaged if high current is applied to it

during testing. Therefore, use a circuit tester

that puts out a measuring current of 1 mA or

less.ProCarManuals.com