ACURA RL KA9 1996 Service Repair Manual

Lock-up System (cont'd)

Half Lock-up

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

Valve B: ON

The modulator pressure is released by the solenoid valve B, causing the modulator pressure in the left side of the lock-up

control valve to lower.

Also the modulator pressure in the left cavity of the lock-up timing valve is low. However, throttle B pressure is still low at

this time; consequently, the lock-up timing valve is kept on the right side by the spring force.

With the torque converter clutch solenoid valve B turned on, the lock-up control valve is moved somewhat to the left side,

causing the back pressure (F2) to lower. This allows a greater amount of the fluid (F1) to work on the lock-up clutch so as

to engage the clutch. The back pressure (F2) which still exists prevents the clutch from engaging fully.

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

Full Lock-up

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

Valve B: ON

When the vehicle speed further increases, throttle B pressure is increased in accordance with the throttle opening.

Throttle B pressure (55) flows to the right side of the lock-up timing valve and the lock-up control valve, and they are moved

to the left side. The lock-up timing valve covers the port leading torque converter pressure (90) from the torque converter to

the lock-up control valve. The lock-up control valve uncovers the port to leak the torque converter pressure (94) and (96). As

this takes place, torque converter back pressure is released fully, causing the lock-up clutch to be engaged fully.

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

THROTTLE B PRESSUREProCarManuals.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

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PCM Termina l Voltage/Measurin g Condition s
A/T Contro l Syste m
The PC M termina l voltag e an d measurin g condition s ar e show n fo r th e connecto r terminal s th e A/ T contro l system . Th e
othe r PC M termina l voltag e an d measurin g condition s ar e describe d in sectio n 11 .
PCM Termina l Location s
PCM CONNECTO R B (16P )
PC M CONNECTO R C (12P )
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PCM CONNECTO R D (22P )
PC M CONNECTO R E (26P )
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PCM Termina l Voltage/Measurin g Condition s
A/T Contro l Syste m (cont'd )
PCM CONNECTO R E (26P ) (cont'd )
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Component Locations

POWERTRAIN CONTROL

MODULE (PCM)

SHIFT LOCK

SOLENOID

PARK PIN

SWITCH

COUNTERSHAFT

SPEED SENSOR

TORQUE CONVERTER CLUTCH

(LOCK-UP CONTROL)

SOLENOID VALVES A AND B
MAINSHAFT SPEED SENSOR

SHIFT SOLENOID

VALVES A AND B

(Located in transmission.)

VEHICLE SPEED

SENSOR (VSS)

A/T CLUTCH PRESSURE

CONTROL SOLENOID VALVE

(Located in transmission.)
TRANSMISSION

RANGE SWITCH

A/T GEAR POSITION

SWITCHProCarManuals.com

Troubleshooting Procedure s
Checking th e Diagnosti c Troubl e Cod e (DTC )
wit h a n OB D II Sca n Too l o r Hond a PG M Teste r
When th e PC M sense s a n abnormalit y i n 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 16 P Dat a Lin k Connecto r (DLC ) (locate d behin d th e ashtray ) i s connecte d to th e OB D II Sca n Too l o r Hond a
PG M Teste r a s shown , th e sca n too l o r teste r wil l indicat e th e Diagnosti c Troubl e Cod e (DTC ) whe n th e ignitio n switc h i s
turne d O N (II) .
If th e indicato r ligh t o r th e MI L ha s bee n reporte d on , o r i f a driveabilit y proble m is suspected , follo w thi s procedure :
1 . Connec t th e OB D II Sca n Too l (conformin g to SA E J1978 ) o r Hond a PG M Teste r t o th e 16 P DLC .
(Se e th e OB D II Sca n Too l o r Hond a PG M Teste r user' s manua l fo r specifi c instructions . I f yo u ar e usin g th e Hond a
PG M Tester , mak e sur e it i s se t t o th e SA E DT C type. )
2 . Tur n th e ignitio n switc h O N (II) , an d observ e th e DT C o n th e screen .
3 . Recor d al l fue l an d emission s DTCs , A/ T DTCs , an d freez e data .
4 . I f ther e is a fue l an d emission s DTC , firs t chec k th e fue l an d emission s syste m a s indicate d b y th e DT C (excep t fo r DT C
P0700) . DT C P070 0 mean s ther e is on e o r mor e A/ T DTC , an d n o problem s wer e detecte d in th e fue l an d emission s circui t
of th e PCM .
5. Ge t th e anti-thef t cod e fo r th e radio , the n writ e dow n th e radi o statio n presets .
6 . Rese t th e memor y wit h th e PG M Teste r o r b y removin g th e BAC K U P fus e i n th e under-hoo d fuse/rela y bo x fo r mor e
tha n 1 0 seconds .
7 . Driv e th e vehicl e fo r severa l minute s a t speed s ove r 3 0 mp h (5 0 km/h) , an d the n rechec k fo r DTCs . I f th e A/ T DT C
returns , g o t o th e Symptom-to-Componen t Char t (pag e 14-5 6 an d 14-57 ). I f th e DT C doe s no t return , ther e wa s a n inter -
mitten t proble m withi n th e circuit . Mak e sur e al l pin s an d terminal s i n th e circui t ar e tight , an d the n g o t o ste p 8 .
8 . Ente r th e anti-thef t cod e fo r th e radio , rese t th e radi o prese t stations , an d se t th e clock .
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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 )
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