1995 ACURA TL Service Repair Manual

Description

Power Flow (cont'd)

Position

Position is provided to drive only in 2nd gear.

1. Hydraulic pressure is applied to the 2nd clutch on the mainshaft, and power is transmitted via the 2nd clutch to the

mainshaft 2nd gear.

2. Power transmitted to the mainshaft 2nd gear is conveyed via the countershaft 2nd gear, which drives the counter-

shaft.

3. Power is transmitted to the secondary drive gear, which drives the secondary driven gear.

NOTE: Hydraulic pressure is also applied to the 1st clutch, but since the rotation speed of the 2nd gear exceeds that

of 1st gear, power from 1st gear is cut off at the one-way clutch.

TORQUE CONVERTER

2ND CLUTCH

MAINSHAFT

SECONDARY

DRIVE GEAR
COUNTERSHAFT

ONE-WAY

CLUTCH

COUNTERSHAFT

2ND GEAR

SECONDARY DRIVEN GEAR
MAINSHAFT

2ND GEARProCarManuals.com

In or position, the optimum gear is automatically selected from 1st, 2nd, 3rd, and 4th gears, according to conditions

such as the balance between throttle opening (engine load) and vehicle speed.

or Position, 1st gear

1. Hydraulic pressure is applied to the 1st clutch, which rotates together with the mainshaft, and the mainshaft 1st gear

rotates.

2. Power is transmitted to the countershaft 1st gear, which drives the countershaft via the one-way clutch.

3. Power is transmitted to the secondary drive gear, which drives the secondary driven gear.

NOTE: In or position, hydraulic pressure is not applied to the 1st-hold clutch.

TORQUE CONVERTER

MAINSHAFT 1ST GEAR

1ST CLUTCH

MAINSHAFT

COUNTERSHAFT

COUNTERSHAFT

1ST GEAR

ONE-WAY CLUTCH

SECONDARY DRIVEN GEAR
PARKING GEAR
SECONDARY

DRIVE GEARProCarManuals.com

Power Flow (cont'd)

or Position, 2nd gear

1. Hydraulic pressure is applied to the 2nd clutch, which rotates together with the mainshaft, and the mainshaft 2nd

gear rotates.

2. Power is transmitted to the countershaft 2nd gear, which drives the countershaft.

3. Power is transmitted to the secondary drive gear, which drives the secondary driven gear.

NOTE: In or position, 2nd gear, hydraulic pressure is also applied to the 1st clutch, but since the rotation speed

of 2nd gear exceeds that of 1st gear, power from 1st gear is cut off at the one-way clutch.

TORQUE CONVERTER

2ND CLUTCH

MAINSHAFT

SECONDARY

DRIVE GEAR

COUNTERSHAFT

ONE-WAY

CLUTCH

SECONDARY DRIVEN GEAR
Description

COUNTERSHAFT

2ND GEAR
MAINSHAFT

2ND GEARProCarManuals.com

or Position, 3rd gear

1. Hydraulic pressure is applied to the 3rd clutch. Power from mainshaft 3rd gear is transmitted to the countershaft 3rd

gear.

2. Power is transmitted to the secondary drive gear, which drives the secondary driven gear.

NOTE: In or position, 3rd gear, hydraulic pressure is also applied to the 1st clutch, but since the rotation speed

of 3rd gear exceeds that of 1st gear, power from 1st gear is cut off at the one-way clutch.

TORQUE CONVERTER

MAINSHAFT 3RD GEAR

MAINSHAFT

SECONDARY

DRIVE GEAR
COUNTERSHAFT

ONE-WAY

CLUTCH

COUNTERSHAFT 3RD GEAR

3RD CLUTCH

SECONDARY DRIVEN GEARProCarManuals.com

Description

Power Flow (cont'd)

Position, 4th gear

1. Hydraulic pressure is applied to the 4th clutch, which rotates together with the mainshaft, and the mainshaft 4th gear

rotates.

2. Power is transmitted to the countershaft 4th gear, which drives the countershaft.

3. Power is transmitted to the secondary drive gear, which drives the secondary driven gear.

NOTE: In position, 4th gear, hydraulic pressure is also applied to the 1st clutch, but since the rotation speed of 4th

gear exceeds that of 1st gear, power from 1st gear is cut off at the one-way clutch.

TORQUE CONVERTER

4TH CLUTCH

MAINSHAFT 4TH GEAR

MAINSHAFT

SECONDARY

DRIVE GEAR
COUNTERSHAFT

ONE-WAY

CLUTCH

REVERSE

SHIFT FORK

SECONDARY DRIVEN GEAR
COUNTERSHAFT

4TH GEAR
REVERSE SELECTOR
REVERSE

SELECTOR

HUBProCarManuals.com

Position
1 . Hydrauli c pressur e i s switche d b y th e manua l valv e t o th e serv o valve , whic h move s th e revers e shif t for k t o th e
revers e position . Th e revers e shif t for k engage s wit h th e revers e selector , revers e selecto r hu b an d th e countershaf t
revers e gear .
2 . Hydrauli c pressur e i s als o applie d t o th e 4t h clutch . Powe r i s transmitte d fro m th e mainshaf t revers e gea r vi a th e
revers e idle r gea r t o th e countershaf t revers e gear .
3 . Th e rotatio n directio n o f th e countershaf t revers e gea r i s change d vi a th e revers e idle r gear .
4 . Powe r i s transmitte d t o th e secondar y driv e gear , whic h drive s th e secondar y drive n gear .
TORQU E CONVERTE R
REVERSEIDLER GEA R
COUNTERSHAF TREVERSE GEA R
MAINSHAF T
COUNTERSHAF T
SECONDARYDRIVE GEAR
COUNTERSHAFT
REVERSE GEAR
REVERSESHI FT FORK
REVERSESELECTOR
REVERSE SELECTOR HUB
SECONDARY DRIVEN GEAR SERVO VALVE MAINSHAF T
REVERSE
GEAR
REVERSEIDLER GEAR
4T H CLUTC H
MAINSHAF T REVERS E GEA R
ProCarManuals.com

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