ACURA NSX 1991 Service Repair Manual

Radiator and Condenser Fan Controls

Control Unit Terminals

THROTTLE VALVE CONTROL

MOTOR RELAY

Wire

Terminal Color
Connects to
1. Disconnect the 3-P connector from the resistor.

RADIATOR

3-P CONNECTOR FAN

RESISTOR

NOT USED

2. Using an ohmmeter, measure resistance between

the A and B terminals. Replace the resistor if the

resistance is not within specifications.

NOTE: Resistance will vary with the resistor

temperature; specifications are at 68°F (20°C).

Radiator Fan Resistor

Resistance: 0.54—0.66 ohms
Radiator Fan Resistor Test

FAN CONTROL

UNITProCarManuals.com

Radiator Fan Motor Test

1. Disconnect the 2-P connector from the radiator fan

motor.

2. Test the motor by connecting battery power to the

A terminal, and ground to the B terminal.

3. If the motor fails to run or does not run smoothly,

replace it.
Condenser Fan Motor Test

1. Disconnect the 2-P connector from the condenser

fan motor.

NOTE: The illustration shows the right condenser.

2. Test the motor by connecting battery power to the

A terminal, and ground to the B terminal.

3. If the motor fails to run or does not run smoothly,

replace it.ProCarManuals.com

Radiator an d Condense r Fa n Control s
Engine Compartmen t Fa n Moto r
Tes t (A/T )
1. Disconnec t th e 2- P connecto r fro m th e engin e
compartmen t fa n motor .
2 . Tes t th e moto r b y connectin g batter y powe r t o th e
A terminal , an d groun d t o th e B terminal .
3 . I f th e moto r fail s t o ru n o r doe s no t ru n smoothly ,
replac e it .
Engin e Compartmen t Fa n Moto r
Remova l (A/T )
1. Disconnec t th e 2- P connecto r fro m th e engin e
compartmen t fa n motor .
2 . Remov e th e engin e compartmen t fa n relay, the tes t
tachomete r connector , an d th e engin e wir e harnes s
fro m th e engin e compartmen t fa n shroud .
3 . Remov e th e thre e mountin g bolts .
MOUNTIN G BOL T6 x 1 0 m m12 N- m (1. 2 kg-m , 9 Ib-ft ) TES
T TACHOMETE RCONNECTOR
WASHER(Corrosio nresistant)
ENGIN E COMPARTMEN T
FAN RELA Y
2-P CONNECTO R
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Fan Relay Tests

Check continuity at the relay terminals.

• There should be continuity between the C and D ter-

minals.

• There should be continuity between the A and B ter-

minals when power and ground are connected to the

C and D terminals.

• There should be no continuity between the A and B

terminals when power is disconnected.

• Radiator fan low relay

• Radiator fan high relay

• Condenser fan relay
Engine compartment fan relay (A/T)ProCarManuals.com

Radiator an d Condense r Fa n Control s
Radiator Fa n Contro l Senso r Tes t
NOTE : Blee d ai r fro m th e coolin g syste m afte r install -
in g th e radiato r fa n contro l senso r (se e sectio n 10 ).
1 . Remov e th e radiato r fa n contro l senso r fro m th e
thermosta t cover .
2 . Suspen d th e radiato r fa n contro l senso r i n a con -
taine r o f coolan t a s shown .
THERMOMETE R
RADIATOR FA NCONTRO L SENSO R
ENGIN E
OIL
3. Hea t th e coolant , an d chec k coolan t temperatur e
with a thermomete r (se e tabl e below) .
4. Measur e th e resistanc e betwee n th e A an d B ter -
minal s accordin g t o th e table .
5 . I f unabl e t o obtai n th e abov e readings , replac e th e
radiato r fa n contro l sensor .
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Gauge Assembly
Gauge/Terminal Location Index
SRS components are located in this area. Review the SRS component locations, precautions, and procedures in the SRS

section (24) before performing repairs or service.

SPEEDOMETER:

Indicates 60 mph [60km/h] at 1.026 [637]

rpm of the vehicle speed sensor (VSS).
FUEL GAUGE: Gauge test, page 23-134 Sending Unit Test, page 23-135

VOLTAGE METER:
If, with the No. 5 (15 A) fuse

and other gauges

OK, the pointer of the

voltage meter does not move at all,
replace the voltage

meter.

SAFETY INDICATOR SYSTEM:
See page 23-145 ('93-'96) ('91-'92)A/T GEAR POSITION
INDICATOR SYSTEM:
See page 23-156 ENGINE OIL PRESSURE
GAUGE:
Test page 23-137
ENGINE COOLANT TEMPERATURE (ECT) GAUGE:
Gauge Test, page 23-136 Sender Test, page 23-136
TACHOMETER:

Indicates 100 rpm at 300 pulses per minute

of the igniter unit.ProCarManuals.com

Gauge Assembl y
Removal
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 i n th e
SR S sectio n 24 befor e performin g repair s o r service .
1 . Remov e th e dashboar d lowe r cover , an d disconnec t
th e floo r wir e harnes s connectors .
2 . Remov e th e tw o screws , the n remov e th e dashboar d
lowe r pa d fro m th e dashboard .
DASHBOAR DLOWER
COVE R
DASHBOAR DLOWER PA D
3. Remov e the thre e screws , then remov e the tilt cove r
fro m th e steerin g column .
TILT COVE R
4. Disconnec t th e connector s fro m th e instrumen t
pane l switches .
5 . Remov e th e si x screws , the n remov e th e instrumen t
pane l tri m fro m th e dashboard .
INSTRUMEN T PANE L TRI M
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6. Remove the eight screws, then remove the steering

column covers.

UPPER COVER

LOWER COVER

7. Disconnect the 30-P connectors from both sides of

the gauge assembly.

30-P CONNECTORS
8. Lay a protective cloth on the combination switches

to prevent scratching the gauge assembly. Remove

the four screws, then take out the gauge assembly

as shown.

PROTECTIVE CLOTH
GAUGE

ASSEMBLYProCarManuals.com

Gauge Assembly

Bulb Locations

GAUGE LIGHTS (1.4W x 2)

SRS INDICATOR LIGHT (1.4 W)

RIGHT TURN SIGNAL INDICATOR LIGHT (1.4 W)

EPS INDICATOR LIGHT (1.4 W)

BRAKE SYSTEM LIGHT (1.4 W)

SEAT BELT REMINDER LIGHT (1.4 W)

TCS INDICATOR

LIGHT (1.96 W)

LOW FUEL INDICATOR

LIGHT (1.4 W)

GAUGE LIGHT

(1.4
W)
HIGH BEAM INDICATOR LIGHT (1.4 W)

LEFT TURN SIGNAL INDICATOR LIGHT (1.4 W)

ABS

INDICATOR LIGHT (1.4 W)

CHARGING SYSTEM LIGHT (1.4 W)

MALFUNCTION

INDICATOR

LAMP (MIL)

(1.4W)

LOW OIL PRESSURE

INDICATOR

LIGHT (1.4 W)

GAUGE LIGHT

(1.4
W)

GAUGE LIGHT

(3.0
W)
GAUGE LIGHT

(3.0
W)
GAUGE LIGHT

(3.0
W)
CRUISE INDICATOR LIGHT

(1.96
W)ProCarManuals.com

Disassembly

NOTE:
Handle the terminals and printed circuit boards carefully to avoid damaging them.
Replace
the
speedometer,
trip
meter,
and
printed
circuit
board
A as a
unit
if any of
them
is
faulty. Replace the tachometer, odometer, and printed circuit board B as a unit if any of them is faulty.

SPEEDOMETER MOUNTING SCREWS (x3) TACHOMETER MOUNTING SCREWS (x3)
VOLTAGE/FUEL GAUGE
MOUNTING SCREWS (x5) ENGINE COOLANT TEMP./ENGINE OIL PRESSURE
GAUGE MOUNTING SCREWS (x6)
HOUSING
ENGINE COOLANT

TEMPERATURE/

ENGINE OIL PRESSURE GAUGE

Test, page 23-136 and 137

SAFETY INDICATOR
MOUNTING SCREWS (x2) SHIFT INDICATOR
TACHOMETER

Specification, page 23-121
A/T GEAR POSITION
INDICATOR

See page 23-152 ('94-'96) ('91-'93)


LIGHT HOUSING
ODOMETER
SPEEDOMETER

Specification, page 23-121

TRIP METER FUEL/VOLTAGE GAUGE

Test, page 23-121

and 134

FACE PANEL PRINTED CIRCUIT
BOARD B
BOARD-TO-BOARD

CONNECTOR

PRINTED CIRCUIT
BOARD COVER
PRINTED CIRCUIT
BOARD A
SAFETY INDICATOR

See page 23-145 ('93-'96)('91-'92)

TRIP METER
RESET BUTTON
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