sensor ACURA TL 1995 Service Manual Online

Description

The electronic control system consists of the Transmission Control Module (TCM), sensors, a linear solenoid, and four

solenoid valves.

Shift and lock-up are electronically controlled for comfortable driving under all conditions.

The TCM is located below the dashboard, behind the glove box on the passenger's side.

TCM

Linear Solenoid

Shift Control

Solenoid Valve A

Shift Control

Solenoid Valve B

Lock-up Control

Solenoid Valve A

Lock-up Control

Solenoid Valve B

Engine Speed Signal

Brake Switch Signal

Mainshaft Speed Sensor

Signal

Countershaft Speed

Sensor Signal

Vehicle Speed Sensor

Signal

Indicator Light

Self-Diagnosis Signal
Electronic Control System

Shift Control

Lock-up Control
Throttle Position

Sensor Signal

Engine Coolant

Temperature

Sensor Signal

Service Check

Connector

Barometric

Pressure Sensor

INTERLOCK

CONTROL UNIT

Self-Diagnosis

FunctionProCarManuals.com

Shift Control

The TCM instantaneously determines which gear should be selected by various signals sent from sensors, and actuates

the shift control solenoid valves A and B control shifting. Also, a Grade Logic Control System has been adopted to control

shifting in position while the vehicle is ascending or descending a slope, or reducing speed.

Lock-up Control

From sensor input signals, the TCM determines whether to turn the lock-up ON or OFF, and activates lock-up control

solenoid valve A and/or B accordingly.

The combination of driving signals to lock-up control solenoid valves A and B is shown in the table below.ProCarManuals.com

Description

GRADE LOGIC CONTROL SYSTEM

How it works:

The TCM compares actual driving conditions with driving conditions memorized in the TCM, based on the input from the

vehicle speed sensor, throttle position sensor, engine coolant temperature sensor, barometric pressure sensor, brake

switch signal and shift lever position signal, to control shifting while a vehicle is ascending or descending a slope, or

reducing speed.

SENSORS

SIGNALS DETECTED

TCM
Electronic Control System (cont'd)ProCarManuals.com

Component Locations

BRAKE SWITCH

TRANSMISSION CONTROL

MODULE (TCM)

ENGINE CONTROL

MODULE (ECM)

THROTTLE POSITION (TP)

SENSOR

ENGINE COOLANT

TEMPERATURE (ECT)

SENSOR
LOCK-UP CONTROL SOLENOID

VALVE ASSEMBLY

MAINSHAFT SPEED SENSOR

COUNTERSHAFT SPEED

SENSOR

VEHICLE SPEED

SENSOR (VSS)
AUTOMATIC TRANSAXLE (A/T)

GEAR POSITION SWITCH

SHIFT CONTROL SOLENOID

VALVE ASSEMBLY*

LINEAR SOLENOID*

*: Located in transmission.ProCarManuals.com

Diagnostic
Troubl e Cod e
(DTC) *
P1794
(13)
P178 6
(14)
P071 5
(15)
P176 8
(16)
P178 7
(18)
P074 0
(none )
P0730
(none )
Indicato r
Light
Blink s
Blinks
'95, '96 , '97
model s
OFF
'98 mode l
Blink s
Blinks
OFF
OF F
OFF
Sympto m
• N o specifi c sympto m appears .
• Transmissio n jerk s har d whe n
shifting .
• Transmissio n jerk s har d whe n
shifting .
• Lock-u p clutc h doe s no t engage .
• Fail s t o shif t (stuc k in 4t h gear) .
• Lock-u p clutc h doe s no t engage .
• Lock-u p clutc h doe s no t hav e
duty operatio n (O N OFF )
• Lock-u p clutc h doe s no t engage .
• Fail s t o shif t (betwee n 1s t -2nd,
1s t - 2n d - 3rd , 1st - 2nd - 4th , 1st
- 3r d - 4th , 2n d - 3r d - 4t h gear s
only) .
• Fail s t o shif t (stuc k in 1s t gear) .
Possibl e Caus e
• Shor t o r ope n in BARO S S (RED/BLU )
wir e betwee n B 2 termina l an d EC M
• Fault y barometri c pressur e (BARO )
sensor
NOTE : BAR O senso r i s buil t int o ECM .
• Shor t o r ope n in FA S (PNK ) wir e
betwee n B1 9 termina l an d EC M
• Fault y EC M
• Disconnecte d mainshaf t spee d senso r
connecto r
• Shor t o r ope n in mainshaf t spee d sen -
so r wir e
• Fault y mainshaf t spee d senso r
• Disconnecte d linea r solenoi d connecto r
• Shor t o r ope n in linea r solenoi d wir e
• Fault y linea r solenoi d
• Disconnecte d o r loose d P G termina l
• Shor t o r ope n in FF S (RED/GRN ) wir e
betwee n A2 4 termina l an d EC M
• Fault y EC M
• Fault y TC M
• Fault y lock-u p contro l syste m
• Fault y shif t contro l syste m
Refer t o
Pag e
14-7 6
14-77
14-7 9
14-8 1
14-8 3
14-8 4
14-8 5
(DTC)* : Th e DTC s i n parenthese s ar e th e code s o f th e indicato r ligh t indicate s whe n th e servic e chec k connecto r i s con -
necte d t o th e specia l too l (SC S servic e connector) .
If th e self-diagnosti c indicato r ligh t doe s no t blink , perfor m a n inspectio n accordin g t o th e tabl e below .
Sympto m
indicator ligh t doe s no t com e o n fo r tw o second s afte r ignitio n
switc h i s firs t turne d o n (II) .
indicato r ligh t i s o n constantl y (no t blinking ) wheneve r th e ignitio n
switch i s o n (II) .
Shif t leve r canno t b e move d fro m positio n wit h th e brak e peda l
depressed . Inspectio
n
Chec k brak e switc h signal . Ref
. pag e
14-86
14-8 8
14-8 9
NOTE :
If a custome r describe s th e sympto m fo r cod e P179 0 (3) , bu t th e indicato r ligh t i s no t blinking , P170 6 (6 ) o r P072 5
(11) , i t wil l b e necessar y t o recreat e th e sympto m b y test-driving , the n rechec k th e DTC .
Sometime s th e indicato r ligh t an d th e Malfunctio n Indicato r Lam p (MIL ) ma y com e o n simultaneously . I f so , repai r
th e PGM-F I syste m accordin g t o th e DTC , the n rese t th e memor y b y removin g th e BAC K U P RADI O fus e i n th e under -
das h fuse/rela y bo x fo r mor e tha n 1 0 seconds . Driv e th e vehicl e fo r severa l minute s a t a spee d ove r 3 0 mp h (5 0 km/h) ,
the n rechec k th e DTC .
ProCarManuals.com

Mainshaft/Countershaft Spee d Sensor s
Replacemen t
Make sur e lifts , jack s an d safet y stand s ar e
place d properl y (se e sectio n 1 ).
1 . Rais e th e fron t o f th e vehicle , an d suppor t i t wit h
safet y stand s (se e sectio n 1 ).
2 . Se t th e parkin g brake , an d bloc k bot h rea r wheel s
securely .
3. Remov e th e transmissio n moun t an d moun t bracket .
12 x 1.2 5 mm54 N- m(5.5 kgf-m ,40 Ibf-ft ]
MOUN TBRACKE T
12 x 1.2 5 mm54 N- m(5.5 kgf-m , 4 0 Ibf-ft )
TRANSMISSIO NMOUNT
INSULATO RRUBBER
MOUNTSTOPPE R
WASHER
12 x 1.2 5 mm64 N- m(6.5 kgf-m , 4 7 Ibf-ft )Replace .
4. Disconnec t th e mainshaf t o r countershaf t spee d
senso r connector .
5. Remov e th e 6 m m bol t fro m th e transmissio n hous -
ing, an d remov e th e mainshaf t o r countershaf t
spee d sensor .
6 . Replac e th e O-rin g wit h a ne w on e befor e rein -
stallin g th e mainshaf t o r countershaf t spee d sensor .
MAINSHAF T SPEE DSENSO R
6 x 1. 0 m m12 N- m(1.2 kgf-m , 8. 7 Ibf-ft )WASHE R(used fro m transmissio n
numbe r M1WA-3010520. )
COUNTERSHAFTSPEED SENSO R
O-RINGReplace .
ProCarManuals.com

Road Tes t
NOTE : War m u p th e engin e to norma l operatin g temperatur e (th e radiato r fa n come s on) .
1. Appl y parkin g brak e an d bloc k th e wheels . Star t th e engine , the n shif t t o positio n whil e depressin g th e brak e
pedal . Depres s th e accelerato r peda l an d releas e it suddenly . Th e engine should no t stall .
2. Repea t sam e tes t i n position .
3. Shif t t o position , an d chec k tha t th e shif t point s o n a fla t roa d occu r a t th e approximat e speed s show n o n th e nex t
page . Als o chec k fo r abnorma l nois e an d clutc h slippage .
NOTE : Throttl e positio n senso r voltag e represent s th e throttl e opening .
-1 . Remov e th e TC M cove r t o expos e th e TC M fo r roa d testing ; refe r t o pag e 14-5 4 an d 14-55 .
-2 . Se t th e digita l multimete r t o chec k voltag e betwee n B 4 (+ ) termina l an d A1 3 (- ) o r A2 6 (- ) termina l o f th e TC M fo r
th e throttl e positio n sensor .
NOTE : Refe r t o pag e 14-55 ; Ho w to us e th e Backprob e Set .
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 i n th e SR S
( sectio n 24 ) befor e performin g repair s o r service .
BACKPROB EADAPTER
B4 Termina l
BACKPROB E SE T07SAZ-001000 A
(tw o required )
A13 o r A2 6Termina l
STACKING PATC H
CORD
TCM
DIGITA L MULTIMETE R
(Commerciall y available )
KS - AH M - 3 2 - 003 ,or equivalen t
TC M CONNECTOR S
WIR E SID E O F FEMAL E TERMINAL S
ProCarManuals.com

Transmission Housing

Removal

NOTE:

Clean all parts thoroughly in solvent or carburetor cleaner, and dry with compressed air.

Blow out all passages.

When removing the transmission housing, replace the following:

O-rings

Transmission housing gasket

TRANSMISSION HOUSING

TRANSMISSION HOUSING

MOUNTING BOLTS

10 x
1.25
mm

10 Bolts

COUNTERSHAFT SPEED

SENSOR

MAINSHAFT SPEED

SENSOR

TRANSMISSION

HOUSING GASKET

Replace.

COUNTERSHAFT

SUB-ASSEMBLY
MAINSHAFT

SUB-ASSEMBLY

SECONDARY DRIVEN

GEAR/SHAFT

TRANSMISSION HOUSING

MOUNTING BOLTS

8 x
1.25
mm

3 Bolts
EXTENSION SHAFT

CONNECTOR BRACKETS

TORQUE CONVERTER

HOUSING

TRANSMISSION HOUSING

MOUNTING BOLT

10 x
1.25
mm
DOWEL PINS, 3
WASHER (M1WA-3010520~)
CONNECTOR HOLDERProCarManuals.com

1. Disconnec t th e mainshaf t an d countershaf t spee d
sensor connectors .
2. Remov e th e connecto r holde r an d connecto r brackets .
3 . Remov e th e countershaf t spee d senso r an d main -
shaf t spee d senso r fro m th e transmissio n housing .
4 . Remov e th e te n bolt s securin g th e transmissio n hous -
ing , the n remov e th e 1 0 m m bol t an d thre e 8 m m
bolt s securin g th e transmissio n housin g t o th e
torqu e converte r housin g side .
5. Instal l th e specia l too l o n th e transmissio n housing ,
then remov e th e transmissio n housin g a s shown .
CAUTION : Mak e sur e tha t th e mainshaf t an d coun -
tershaf t spee d sensor s hav e bee n remove d fro m th e
transmissio n housin g befor e removin g th e trans -
missio n housin g fro m th e torqu e converte r housing .
HOUSING PULLE R07HAC-PK4010 A
TRANSMISSIONHOUSING
6. Remov e th e mainshaf t sub-assembl y an d counter -
shaft sub-assembl y together .
NOTE: Whe n removin g th e shafts , tak e car e t o pre -
ven t damag e t o th e regulato r valv e body .
MAINSHAF TSUB-ASSEMBL YCOUNTERSHAF TSUB-ASSEMBLY
7. Remov e th e secondar y drive n gea r shaf t fro m th e
torqu e converte r housing .
ProCarManuals.com

Transmission

Reassembly (cont'd)

6 x 1.0 mm

12 N-m (1.2 kgf-m, 8.7 Ibf-ft)

CONNECTOR HOLDER

TRANSMISSION HOUSING

TRANSMISSION HOUSING

MOUNTING BOLTS

10 x
1.25
mm

10 Bolts

44 N-m (4.5 kgf-m, 33 Ibf-ft)

TRANSMISSION

HOUSING GASKET.

Replace.

COUNTERSHAFT

SUB-ASSEMBLY

TRANSMISSION HOUSING

MOUNTING BOLTS

8 x
1.25
mm

3 Bolts

33 N-m (3.4 kgf-m, 25 Ibf-ft)
COUNTERSHAFT SPEED

SENSOR

6 x 1.0 mm

12 N-m (1.2 kgf-m, 8.7 Ibf-ft)

MAINSHAFT SPEED

SENSOR

MAINSHAFT

SUB-ASSEMBLY

SECONDARY DRIVEN

GEAR/SHAFT

EXTENSION SHAFT

CONNECTOR BRACKETS

TORQUE CONVERTER

HOUSING

TRANSMISSION HOUSING

MOUNTING BOLT

10 x
1.25
mm

44 N-m (4.5 kgf-m, 33 Ibf-ft)
DOWEL PINS, 3
WASHER

(M1WA-3010520~)ProCarManuals.com