1991 ACURA NSX Service Repair Manual

Component Locations

Index

ENGINE COOLANT TEMPERATURE (ECT) SENSOR

Troubleshooting, page 11 -66
INTAKE AIR TEMPERATURE (IAT) SENSOR
Troubleshooting, page 11-70
FUEL PUMP RESISTER

Troubleshooting, page 11-124

CRANKSHAFT POSITION/CYLINDER POSITION
(CKP/CYP) SENSOR

Troubleshooting, page 11-64

FUEL

INJECTOR

RESISTER
Testing,

page 11-112
FRONT HEATED OXYGEN SENSOR (HO2S)
Troubleshooting, page 11-48
REAR KNOCK SENSOR (KS)

Troubleshooting, page 11-80

FRONT KNOCK SENSOR (KS)

Troubleshooting, page 11-80

REAR HEATED OXYGEN SENSOR (HO2S)
Troubleshooting, page 11-48
IDLE AIR CONTROL (IAC) VALVE

Troubleshooting, page 11 -88

FAST IDLE THERMO VALVE

Inspection, page 11-101

NEUTRAL SWITCH (M/T)

Troubleshooting, page 11-96

SERVICE CHECK CONNECTOR (2P)
Self-diagnostic Procedures, page 11-34
ENGINE CONTROL MODULE (ECM)
Self-diagnostic Procedures, page 11-34
Troubleshooting, page 11-42
PGM-FI

MAIN RELAY

Relay Testing, page 11-120

Troubleshooting, page 11-122
THROTTLE POSITION (TP) SENSOR

Troubleshooting, page 11 -68
CONTROL BOX
page, 11-7
ACCELERATOR PEDAL
ANGLE SENSOR

Troubleshooting, section 19
EXHAUST GAS RECIRCULATION (EGR) VALVE

Troubleshooting, page 11-145
EXHAUST GAS RECIRCULATION (EGR)
VALVE LIFT SENSOR

Troubleshooting, page 11-145ProCarManuals.com

Component Locations

Index
FUEL TANK EVAPORATIVE EMISSION(EVAP) VALVE
EVAPORATIVE EMISSION (EVAP) TWO WAY VALVE

Testing, page 11-157
FUEL PUMP

Troubleshooting, page 11-116
Testing, page 11-119

Replacement, page 11-119
FUEL FEED PIPE
FUEL FILTERReplacement, page 11-114
FUEL PRESSURE REGULATOR
Testing, page 11-113

Replacement, page 11-114

FUEL RETURN PIPE
FUEL INJECTORS

Troubleshooting, page 11-107
Replacement, page 11-110
FUEL PUMP RELAY

Troubleshooting, page 11-116
FUEL RAIL
FUEL TANK
Replacement, page 11-126

FUEL

VAPOR HOSE
EVAPORATIVE EMISSION
(EVAP) CONTORL CANISTER

Troubleshooting, page 11-154

FUEL FILL CAPProCarManuals.com

THROTTLE BODY (TB)

Inspection, page 11-131

Disassembly, page 11-133

THROTTLE VALVE DASHPOT CONTROL DIAPHRAGM

Testing, page 11-135

AIR CLEANER (ACL)
Disassembly, page 11 -129

INTAKE AIR DUCT
INTAKE AIR BYPASS (IAB) CONTROL DIAPHRAGM

Troubleshooting, page 11-137

Test, page 11-139
POSITIVE CRANKCASE VENTILATION (PCV) VALVE

Inspection, page 11-151

INTAKE AIR BYPASS (IAB) VALVE BODY ASSEMBLY
Disassembly, page 11-140
THROTTLE CABLE

Inspection/Adjustment, page 11-130

Installation, page 11-130ProCarManuals.com

System Description
Vacuum Connections
CONTROL
BOX
page 11-7

THROTTLE
VALVE
DASHPOT
CHECK VALVE

EVAP

PURGE CONTROL
DIAPHRAGM VALVE
EVAP CONTROL
CANISTER
TO EVAP TWO-WAY

VALVE
FRONT OF
VEHICLE
THROTTLE VALVE
DASHPOT CONTROL

DIAPHRAGM

EGR VALVE
LIFT SENSOR
FUEL PRESSURE

REGULATOR

INTAKE

AIR

BYPASS

(IAB)

DIAPHRAGM
EGR VALVEProCarManuals.com

Control Box
EVAPORATIVE EMISSION
(EVAP) PURGE CONTROL SOLENOID

VALVE

Troubleshooting, page 11-154

EXHAUST GAS RECIRCULATION (EGR) CONTROL SOLENOID
VALVE
Troubleshooting,

page 11-145
EXHAUST GAS RECIRCULATION (EGR)
VACUUM CONTROL VALVE

Troubleshooting, page 11-145

MANIFOLD ABSOLUTEPRESSURE (MAP) SENSOR
Troubleshooting, page 11 -58

(cont'd)

INTAKE AIR BYPASS (IAB) VACUUM TANK
INTAKE AIR BYPASS (IAB) CHECK VALVE INTAKE AIR BYPASS
(IAB) CONTROL SOLENOID

VALVE

Troubleshooting,

page 11-137ProCarManuals.com

System Description
Vacuum Connections (cont'd)
FRONT HEATED OXYGEN SENSOR (HO2S)
REAR HEATED OXYGEN SENSOR (HO2S)
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSORINTAKE AIR TEMPERATURE (IAT) SENSOR
FRONT KNOCK SENSOR (KS)
REAR KNOCK SENSOR (KS) IDLE AIR CONTROL (IAC) VALVE
FAST IDLE THERMO VALVE
AIR CLEANER (ACL) FUEL INJECTORFUEL PRESSURE REGULATOR
FUEL FILTER
FUEL PUMP (FP)
FUEL TANK
THROTTLE VALVE DASHPOT CONTROL DIAPHRAGM
THROTTLE VALVE DASHPOT CHECK VALVE INTAKE AIR BYPASS (IAB) CHECK VALVE
INTAKE AIR BYPASS (IAB) VACUUM TANK
INTAKE AIR BYPASS (IAB) CONTROL SOLENOID VALVE
INTAKE AIR BYPASS (IAB) CONTROL DIAPHRAGM
FRONT THREE WAY CATALYTIC CONVERTER (TWC)
REAR THREE WAY CATALYTIC CONVERTER (TWC)
POSITIVE CRANKCASE VENTILATION (PCV) VALVE
EXHAUST GAS RECIRCULATION (EGR) VALVE
EXHAUST GAS RECIRCULATION (EGR) VALVE LIFT SENSOR
EXHAUST GAS RECIRCULATION (EGR) VACUUM CONTROL VALVE
EXHAUST GAS RECIRCULATION (EGR) CONTROL SOLENOID VALVE
EVAPORATIVE EMISSION (EVAP) CONTROL CANISTER
EVAPORATIVE EMISSION (EVAP) PURGE CONTROL SOLENOID VALVE
EVAPORATIVE EMISSION (EVAP) PURGE CONTROL DIAPHRAGM VALVE
EVAPORATIVE EMISSION (EVAP) TWO WAY VALVEProCarManuals.com

System Description
Electrical Connections

FUSES
CLOCK (7.5 A)*

ACG
(120 A)**

ACG(S) (20 A)**

IG COIL (30 A)**

No. 2 (15 A)

No. 5 (10 A)
No.
4(15
A)

No. 7
(7.5
A)
In the under-hood
fuse/relay box In the engine
compartment
fuse/relay box

CKP/CYP

SENSOR

TO A/T
GEAR

POSITION
SWITCH

NEUTRAL

SWITCH
(M/T)

AUTO A/C

CONTROL

UNIT
CLUTCH
SWITCH
(M/T)
SERVICE

CHECK

CONNECTOR

A/C

PRESSURE

SWITCH A
A/C

PRESSURE

SWITCH B FUEL PUMP

RESISTORProCarManuals.com

MAP

SENSOR

TP SENSOR
IGNITION

TIMING

ADJUSTER
EGR VALVE
LIFT SENSOR

ACCELERATOR

PEDAL ANGLE

SENSOR

FRONT

HO2S

REAR
HO2S
REAR FRONT
KS KS

TERMINAL LOCATION
(cont'd)

REAR VTEC
SOLENOID VALVE
FRONT VTEC
SOLENOID VALVE

FRONT

VTEC

PRESSURE

SWITCH

REAR

VTEC
PRESSURE

SWITCH
TACHOMETER
CONNECTOR
IGNITION COIL

ICMProCarManuals.com