1996 ACURA RL KA9 light

Throttle Bod y
Descriptio n
The throttl e bod y i s a single-barre l side-draf t type . Th e
lowe r portio n o f th e throttl e valv e i s heate d b y engin e
coolan t fro m th e cylinde r head . Th e idl e adjustin g screw ,
whic h increases/decrease s bypas s air , an d th e Evapora -
tiv e Emissio n (EVAP ) Caniste r por t ar e locate d o n th e to p
of th e throttl e body .
THROTTL E
POSITIO N
(TP)SENSO R
IDLE ADJUSTIN GSCREW
THROTTL EVALVE
THROTTL ESTOPSCRE W(Do no t adjust. )
Inspectio n
1 . Disconnec t th e vacuu m hos e (t o th e EVA P canister )
fro m th e to p o f th e throttl e body ; connec t a vacuu m
gaug e t o th e throttl e body .
VACUU M PUMP/GAUGE , 0 - 3 0 in.H g
A973 X - 04 1 - XXXX X
2. Allo w th e engin e t o idle , an d chec k tha t th e gaug e
indicate s n o vacuum .
I f ther e i s vacuum , chec k th e throttl e cabl e (se e
pag e 11-154 ).
3 . Chec k tha t vacuu m is indicate d o n th e gaug e whe n
the throttl e is opene d slightl y fro m idle .
If th e gaug e indicate s n o vacuum , chec k th e throttl e
bod y port . I f th e throttl e bod y por t i s clogged , clea n
i t wit h carbureto r cleaner .
4 . Sto p th e engine , an d chec k tha t th e throttl e cabl e
operate s smoothl y withou t bindin g o r sticking .
I f ther e ar e an y abnormalitie s i n th e abov e steps ,
chec k for .
• Excessiv e wea r o r pla y i n th e throttl e valv e shaft .
• Stick y o r bindin g throttl e leve r a t ful l clos e posi -
tion.
• Clearanc e betwee n throttl e sto p scre w an d throt -
tl e leve r a t th e full y close d position .
There shoul d b e
n o clearance .
THROTTL E LEVE R
THROTTL E
LEVER
THROTTL E STO P SCRE W
(D o no t adjust. )
Replace th e throttl e bod y i f ther e i s excessiv e pla y
i n th e throttl e valv e shaf t o r i f th e shaf t i s bindin g o r
sticking .
ProCarManuals.com

Emission Contro l Syste m
System Descriptio n
The emissio n contro l syste m include s a Thre e Wa y Cata -
lyti c Converte r (TWC) , Exhaus t Ga s Recirculatio n (EGR )
system , Positiv e Crankcas e Ventilatio n (PCV ) syste m an d
Evaporativ e Emissio n (EVAP ) system . Th e emissio n contro l
syste m is designe d t o mee t federa l an d stat e emissio n
standards .
Tailpipe Emissio n
Inspection
Do no t smok e durin g thi s procedure . Kee p
an y ope n flam e awa y fro m you r wor k area .
1 . Star t th e engine . Hol d th e engin e a t 3,00 0 rp m wit h
n o loa d (i n Par k o r neutral ) unti l th e radiato r fa n
come s on , the n le t i t idle .
2 . Connec t a tachometer .
3 . Chec k an d adjus t th e idl e speed , i f necessar y (se e
pag e 11-124 ).
4 . War m u p an d calibrat e th e C O mete r accordin g to th e
mete r manufacturer' s instructions .
5 . Chec k idl e C O wit h th e headlights , heate r blower ,
rea r windo w defogger , coolin g fan , an d ai r condition -
er off .
NOTE : (Canada ) Depres s th e parkin g brak e pedal .
Star t th e engine , the n chec k tha t th e headlight s ar e
off.
CO mete r shoul d indicat e 0.1 % maximum .
Three Wa y Catalyti c Converte r
(TWC)
Descriptio n
Th e Thre e Wa y Catalyti c Converte r (TWC) is use d t o
conver t hydrocarbon s (HC) , carbo n monoxid e (CO) , an d
oxide s o f nitroge n (NOx) in th e exhaus t gas , t o carbo n
dioxid e (CO
2), dinitroge n (N2) an d wate r vapor .
SECONDAR Y HEATE D OXYGE N SENSO R (SENSO R 2)
HOUSIN G
THREE WA Y
CATALYST S
ProCarManuals.com

Emission Contro l Syste m
Positiv e Crankcas e Ventilatio n (PCV ) Syste m
Descriptio n
Th e Positiv e Crankcas e Ventilatio n (PCV ) syste m is
designe d t o preven t blow-b y ga s fro m escapin g t o th e
atmosphere . Th e PC V valv e contain s a spring-loade d
plunger . Whe n th e engin e starts , th e plunge r i n th e PC V
valv e is lifte d in proportio n to intak e manifol d vacuu m an d
th e blow-b y ga s is draw n directl y int o th e intak e manifold .
BREATHE R PIP E
PCV HOS E
PCV VALV E
BLOW-B Y VAPO RFRESH AI R
Inspectio n
1. Remov e th e engin e cover . Chec k th e PC V hose s an d
connection s fo r leak s an d clogging .
PCV HOS E
PCVVALV E
BREATHE RPIPE
2. A t idle , mak e sur e ther e is a clickin g soun d fro m th e
PC V valv e whe n th e hos e betwee n th e PC V valv e
an d intak e manifol d i s lightl y pinche d wit h you r fin -
ger s o r pliers .
Gently pinc h her e
If ther e i s n o clickin g sound , chec k th e PC V valv e grom -
me t fo r crack s an d damage . I f th e gromme t i s OK ,
replac e th e PC V valv e an d recheck .
ProCarManuals.com

Electronic Control System

The electronic control system consists of a Powertrain Control Module (PCM), sensors, a A/T clutch pressure control

solenoid and four solenoid valves. Shifting and lock-up are electronically controlled for comfortable driving under all con-

ditions. The PCM is located below the dashboard, under the front lower panel on the passenger's side.

PCM

Throttle Position Sensor

Signal

Engine Coolant Temperature

Sensor Signal

Indicator Light

Self-Diagnosis Signal
PGM-FI

Control System

Shift Control

Lock-up Control

A/T Control System

Self-Diagnosis

Function
Vehicle Speed Sensor

Signal

Service Check Connector

Shift Solenoid

Valve A

Shift Solenoid

Valve B

A/T Clutch Pressure Control

Solenoid Valve

Torque Converter Clutch

(Lock-up Control)

Solenoid Valve A

Torque Converter Clutch

(Lock-up Control)

Solenoid Valve B

Mainshaft Speed Sensor

Signal

Countershaft Speed

Sensor Signal
Interlock SystemProCarManuals.com

Partial Lock-up

Torque Converter Clutch (Lock-up Control) Solenoid Valve A: ON Torque Converter Clutch (Lock-up Control) Solenoid

Valve B: OFF

The PCM switches the solenoid valve A on to release the modulator pressure in the left cavity of the lock-up shift valve.

The modulator pressure in the right cavity of the lock-up shift valve overcomes the spring force; thus the lock-up shift

valve is moved to the left side.

The line pressure is then separated into the two passages to the torque converter:

Torque Converter Inner Pressure: enters into right side to engage lock-up clutch

Torque Converter Back Pressure: enters into left side to disengage lock-up clutch

The back pressure (F2) is regulated by the lock-up control valve, whereas the position of the lock-up timing valve is deter-

mined by the throttle B pressure, tension of the valve spring, and pressure regulated by the modulator valve. Also the posi-

tion of the lock-up control valve is determined by the back pressure of the lock-up control valve and torque converter pres-

sure regulated by the check valve. With the torque converter clutch solenoid valve B kept off, the modulator pressure is main-

tained in the left side of the lock-up control valve; in other words, the lock-up control valve is moved slightly to the right side.

This slight movement of the lock-up control valve causes the back pressure to be lowered slightly, resulting in partial lock-up.

NOTE: When used, "left" or "right" indicates direction on the hydraulic circuit.ProCarManuals.com

Description

Lock-up System (cont'd)

Deceleration Lock-up

Torque Converter Clutch (Lock-up Control) Solenoid Valve A: ON Torque Converter Clutch (Lock-up Control) Solenoid

Valve B: Duty Operation

The PCM switches solenoid valve B on and off rapidly under certain conditions. The slight lock-up and half lock-up regions

are maintained so as to lock the torque converter properly.

NOTE: When used, "left" or "right" indicates direction on the hydraulic circuit.ProCarManuals.com

Park Mechanism

The park mechanism locks the transmission by engaging the park pawl with the park gear which is splined to the counter-

shaft.

Shifting to [3 position causes the park cone (installed at the end of the park rod) to press the park pawl onto the park gear.

Even if the end of the park pawl rides on top of the park gear teeth, slight movement of the countershaft will cause the

park pawl and the park gear to mesh with each other completely because the park cone receives tension from the park rod

spring. The park pawl receives the tension (which acts to separate the park pawl from the park gear) from the park pawl

spring.

COUNTERSHAFT

PARK ROD SPRING

PARK PAWL
PARK GEAR

PARK ROD HOLDER

PARK CONEProCarManuals.com

Checking th e Diagnosti c Troubl e Cod e (DTC )
wit h th e Servic e Chec k Connecto r an d Specia l Too l
Whe n th e PC M sense s a n abnormalit y in th e inpu t o r outpu t systems , th e indicato r ligh t i n th e gaug e assembl y wil l blink .
Whe n th e Servic e Chec k Connecto r (locate d unde r th e das h o n th e passenge r side ) i s connecte d wit h th e specia l too l a s
shown , th e indicato r ligh t wil l blin k th e Diagnosti c Troubl e Cod e (DTC ) whe n th e ignitio n switc h i s turne d O N (II) .
Whe n th e indicato r ligh t ha s bee n reporte d on , connec t th e Servic e Chec k Connecto r wit h th e specia l tool .
Then tur n th e ignitio n switc h O N (II ) an d observ e th e indicato r light .
INDICATO RLIGHT
Code s 1 throug h 9 ar e indicate d b y individua l shor t blinks . Code s 1 0 an d abov e ar e indicate d b y a serie s o f lon g an d shor t
blinks . On e lon g blin k equal s 1 0 shor t blinks . Ad d th e lon g an d shor t blink s togethe r t o determin e th e code . Afte r deter -
minin g th e code , refe r t o th e electrica l syste m Symptom-to-Componen t Char t o n page s 14-5 6 an d 14-57 .
NOTE :
• Disconnectin g th e BAC K UP , RADI O fus e als o cancel s th e radi o anti-thef t code , prese t station s an d th e cloc k setting . Ge t
th e customer' s cod e number , an d mak e not e o f th e radi o preset s befor e removin g th e fus e s o yo u ca n rese t them .
• Th e PC M memor y mus t b e rese t afte r reconnectin g th e batter y o r th e BAC K UP , RADI O fus e (se e pag e 11-111 ).
SC S SERVIC E CONNECTO R07PAZ-001010 0
GAUGE ASSEMBL Y
SERVICE CHEC KCONNECTO R (2P )
ProCarManuals.com