1995 ACURA TL lock

Description

Regulator Valve Body

The regulator valve body is located on the ATF pump body. The regulator valve body consists of the regulator valve, the

lock-up shift valve, and the cooler relief valve.

REGULATOR VALVE

BODY

REGULATOR VALVE

LOCK-UP SHIFT

VALVE

COOLER RELIEF

VALVE
STATOR SHAFT ARM
Hydraulic Control (cont'd)ProCarManuals.com

Description

Hydraulic Control (cont'd)

ATF Pump Body

The ATF pump body is located on the torque converter housing. The ATF pump body consists of the ATF pump gears, the

lock-up control valve, the lock-up timing valve, the relief valve and the modulator valve. The torque converter check valve

is located between the ATF pump body and the torque converter housing.

Throttle Valve Body/Linear Solenoid

The throttle valve body is joined with the linear solenoid which is controlled by the TCM. The throttle valve body/linear

solenoid assembly is located on the 2nd accumulator body. The throttle valve body houses the throttle valve.

2nd Accumulator Body

The 2nd accumulator body is located on the torque converter housing beside the ATF pump body. It contains the 2nd

accumulator.

RELIEF VALVE

LOCK-UP CONTROL

VALVE

LOCK-UP TIMING

VALVE

TORQUE CONVERTER

CHECK VALVE
ATF PUMP BODY

ATF PUMP DRIVE GEAR

ATF PUMP DRIVEN GEAR

MODULATOR VALVE

LINEAR SOLENOID

THROTTLE VALVE

2ND ACCUMULATOR

2ND ACCUMULATOR

BODYProCarManuals.com

Hydraulic Flow

General Chart of Hydraulic Pressure

ATF Pump

Line Pressure
Modulator Pressure

Throttle B Pressure

Clutch Pressure

Torque Converter Pressure

Lubrication Pressure

Distribution of Hydraulic Pressure

Regulator Valve
Torque Converter Pressure

Lubrication Pressure

To Regulate Line Pressure

Manual Valve

Modulator Valve
To Select Line Pressure

Modulator Pressure

1-2 Shift Valve

2-3 Shift Valve

3-4 Shift Valve

Throttle Valve
Clutch Pressure

Throttle B Pressure
Clutch Pressure

Shift Control Solenoid Valves

Lock-up Control Solenoid Valves
Regulator ValveProCarManuals.com

Description

Position

As the engine turns, the ATF pump also starts to operate. Automatic transmission fluid (ATF) is drawn from (99) and dis-

charged into (1). Then, ATF flowing from the ATF pump becomes the line pressure (1). The line pressure (1) is regulated

by the regulator valve. The torque converter inlet pressure (92) enters (94) of the torque converter through the lock-up

shift valve and discharges into (90).

The torque converter check valve prevents the torque converter pressure from rising.

Under this condition, the hydraulic pressure is not applied to the clutches as the manual valve stops line pressure (1).

NOTE: When used, "left" or "right" indicates direction on the hydraulic circuit.
Hydraulic Flow (cont'd)ProCarManuals.com

Description

The parking brake mechanism locks the transmission by engaging the parking brake pawl into the parking gear which is

splined to the countershaft.

Shifting to position causes the parking brake pawl roller (installed at the end of the parking brake shift arm) to press the

parking brake pawl onto the parking gear. Even if the end of the parking brake pawl rides on top of the parking gear teeth,

slight movement of the countershaft will cause the parking brake pawl and the parking gear to mesh with each other com-

pletely, because the parking brake shift arm receives tension from the parking brake shift arm spring. The parking brake

pawl receives the tension (which acts to separate the parking brake pawl from the parking gear) from the parking pawl

spring.

PARKING GEAR
COUNTERSHAFT

1ST GEAR

PARKING BRAKE

PAWL

PARKING BRAKE

PAWL ROLLER

CONTROL SHAFT

PARKING PAWL

SPRING
PARKING BRAKE

SHIFT ARM
Parking Brake MechanismProCarManuals.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

Troubleshooting Procedures

Checking the Diagnostic Trouble Code (DTC)

with an OBD II Scan tool or Honda PGM Tester

When the TCM senses an abnormality in the input or output systems, the indicator light in the gauge assembly will

blink. When the 16P Data Link Connector (DLC) (located behind the ashtray) is connected to the OBD II Scan Tool or Honda

PGM Tester as shown, the scan tool or tester will indicate the Diagnostic Trouble Code (DTC) when the ignition switch is

turned ON(II).

When the indicator light has been reported on, connect the OBD II Scan Tool conforming to SAE J1978 or Honda PGM

Tester to the DLC (16P) behind the ashtray. Turn the ignition switch on (II), and observe the DTC on the screen of the OBD II

Scan Tool or Honda PGM Tester. After determining the DTC, refer to the electrical system Symptom-to-Component Chart

on page 14-56 and 14-57.

NOTE: See the OBD II Scan Tool or Honda PGM Tester user's manual for specific instruction.

OBD II SCAN TOOL or

HONDA PGM TESTER

Some PGM-FI problems will also make the indicator light come on. After repairing the PGM-FI system, disconnect the

BACK UP RADIO fuse (10 A) in the under-hood fuse/relay box for more than 10 seconds to reset the TCM memory, then

retest.

NOTE: Disconnecting the BACK UP RADIO fuse also cancels the radio anti-theft code, preset stations and the clock setting.

Get the customer's code number, and make note of the radio presets before removing the fuse so you can reset them.
DATA LINK CONNECTOR (16P)ProCarManuals.com

Symptom-to-Component Char t
Electrica l Syste m
Diagnosti c
Troubl e Cod e
(DTC) *
P1753
(1)
P175 8
(2)
P179 0
(3)
P179 1
(4)
P170 5
(5)
P170 6
(6)
P075 3
(7)
P075 8
(8)
P072 0
(9)
P179 2
(10)
P072 5
(11)
Indicato r
Light
Blink s
Blink s
Blinks o r
OF F
Blink s
Blink s
OFF
Blink s
Blink s
Blinks
Blink s
OFF
Sympto m
• Lock-u p clutc h doe s no t engage .
• Lock-u p clutc h doe s no t disen -
gage.
• Lock-u p clutc h doe s no t engage .
• Lock-u p clutc h doe s no t engage .
• Lock-u p clutc h doe s no t engage .
• Fail s t o shif t othe r tha n 2n d - 4t h
gears .
• Lock-u p clutc h doe s no t engage .
• Fail s t o shif t othe r tha n 2n d - 3r d
- 4t h gears .
• Lock-u p clutc h doe s no t engage .
• Fail s t o shif t (betwee n 1s t - 4t h
o r 2n d - 3r d gea r only) .
• Fail s t o shif t (stuc k in 4t h gear) .
• Fail s t o shif t (stuc k i n 1s t o r 4t h
gears) .
• Lock-u p clutc h doe s no t engage .
• Lock-u p clutc h doe s no t engage .
• Lock-u p clutc h doe s no t engage . Possibl
e Caus e
• Disconnecte d lock-u p contro l solenoi d
valv e A connecto r
• Shor t o r ope n i n lock-u p contro l
solenoi d valv e A wir e
• Fault y lock-u p contro l solenoi d valv e A
• Disconnecte d lock-u p contro l solenoi d
valv e B connecto r
• Shor t o r ope n i n lock-u p contro l
solenoi d valv e B wir e
• Fault y lock-u p contro l solenoi d valv e B
• Disconnecte d throttl e positio n (TP )
senso r connecto r
• Shor t o r ope n in T P senso r wir e
• Fault y T P senso r
• Disconnecte d vehicl e spee d senso r
(VSS ) connecto r
• Shor t o r ope n i n VS S wir e
•Fault y VS S
• Shor t i n A/ T gea r positio n switc h wir e
• Fault y A/ T gea r positio n switc h
• Disconnecte d A/ T gea r positio n switc h
connecto r
• Ope n i n A/ T gea r positio n switc h wir e
• Fault y A/ T gea r positio n switc h
• Disconnecte d shif t contro l solenoi d
valv e A connecto r
• Shor t o r ope n i n shif t contro l solenoi d
valv e A wir e
• Fault y shif t contro l solenoi d valv e A
• Disconnecte d shif t contro l solenoi d
valv e B connecto r
• Shor t o r ope n i n shif t contro l solenoi d
valv e B wir e
• Fault y shif t contro l solenoi d valv e B
• Disconnecte d countershaf t spee d sen -
so r connecto r
• Shor t o r ope n i n countershaf t spee d
senso r wir e
• Fault y countershaf t spee d senso r
• Disconnecte d engin e coolan t tempera -
ture (ECT ) senso r connecto r
• Shor t o r ope n in EC T senso r wir e
• Fault y EC T senso r
• Disconnecte d ignitio n coi l connecto r
• Shor t o r ope n i n ignitio n coi l wir e
• Fault y ignitio n coi l
Refe r t o
Pag e
14-5 8
14-6 0
14-6 2
14-6 3
14-6 4
14-6 6
14-6 8
14-7 0
14-7 2
14-7 4
14-7 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 to th e specia l too l (SC S servic e connector) .
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