Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 627

7A1–8 AUTOMATIC TRANSMISSION (4L30-E)

CONTROL SYSTEM DIAGRAM

AUTOMATIC TRANSMISSION ASSEMBLY

ENGINE

LOCKUP PISTON

TORQUE

CONVERTER

INPUT SHAFT

PLANETARY GEAR

MULTIPLATE CLUTCH

MULTIPLATE BRAKE

BRAKE BAND

ONE WAY CLUTCH

OUTPUT SHAFT

TIRE

FINAL DRIVE GEAR

DRIVE SHAFT

OIL PUMP

SERVO MECHANISM

CONTROL VALVE

:

POWER
TRANSMIT

:

OIL PRESSURE
CONTROL

:

MECHANICAL
SIGNAL

:

ELECTRONIC
SIGNAL

OIL TEMP.

SENSOR

TORQUE CONVERTER

CLUTCH SOLENOID

SHIFT SOLENOID A

SHIFT SOLENOID B

BAND APPLY

SOLENOID

FORCE MOTOR

MANUAL VALVE

VEHICLE SPEED

SENSOR

MODE

SWITCH

CHECK TRANS LAMP

POWER LAMP

KICKDOWN SWITCH

BRAKE SWITCH

POWER MODE SWITCH

AIR CONDITIONING

SWITCH

TRANSMISSION CONTROL

MODULE (TCM)

•   SHIFT CONTROL

•   BAND APPLY CONTROL

•   TORQUE CONVERTER CLUTCH
    CONTROL

•   LINE PRESSURE CONTROL

•   SAFETY MODE

•   ON-BOARD DIAGNOSTIC
    SYSTEM

•   TORQUE MANAGEMENT

SHIFT INDICATOR LAMP

A/T SHIFT INDICATOR
CONTROL UNIT

(

(

CRANK ANGLE SENSOR

THROTTLE POSITION

SENSOR

ENGINE COOLANT

TEMPERATURE SENSOR

ECM

C07LW001

AUTOMATIC TRANSMISSION (4L30-E) 7A1–9

1.

SHIFT CONTROL

The transmission gear is shifted according to the
shift pattern selected by the driver.
In shifting gears, the gear ratio is controlled by the
ON/OFF signal using the shift solenoid A and the
shift solenoid B.

2.

BAND APPLY CONTROL

The band apply is controlled when in the 3-2
downshift (engine overrun prevention) and the
garage shift (shock control).
The band apply solenoid is controlled by the signal
from the Pulse Width Modulation (PWM) to regulate
the flow of the oil.

3.

TORQUE CONVERTER CLUTCH CONTROL

The clutch ON/OFF is controlled by moving the
converter clutch valve through shifting Torque
Converter Clutch (TCC) solenoid using the ON/OFF
signal.

4.

LINE PRESSURE CONTROL

The throttle signal allows the current signal to be
sent to the force motor. After receiving the current
signal, the force motor activates the pressure
regulator valve to regulate the line pressure.

5.

ON-BOARD DIAGNOSTIC SYSTEM

Several malfunction displays can be stored in the
Transmission Control Module (TCM) memory, and
read out of it afterward.
The serial data lines, which are required for the
testing of the final assembly and the coupling to
other electronic modules, can be regulated by this
function.

6.

FAIL-SAFE MECHANISM

If there is a problem in the transmission system, the
TCM will go into a “backup” mode. The vehicle can
still be driven, but the drive must use the gear lever
to shift gears.

7.

TORQUE MANAGEMENT CONTROL

The TCM sends the absolute spark advance signal
to the Engine Control Module (ECM) while the
transmission is being shifted, to control the engine
spark timing in compliance with the vehicle running
condition to reduce the shocks caused by the
change of speed.

7A1–10 AUTOMATIC TRANSMISSION (4L30-E)

SHIFT MODE CONTROL

1

Mode type

Mode type

Select lever position

Normal drive mode (NOR)

Entire range (excluding “R”)

Power drive mode (PWR)

Entire range (excluding “R”)

2

Mode selection

SWITCH (SW)

LAMP

Mode type

PWR/NOR. SW

POWER DRIVE LAMP

Normal drive mode (NOR)

OFF

OFF

Power drive mode (PWR)

ON

ON

3

Comparison of mode

(1)

The normal drive mode is set at the normal shift points.

(2)

The shift points of the power drive mode are shifted to the higher speed side, compared to the
normal drive mode.

Shift diagram

2

3

3

4

1

2

2

1

2

3

4

3

N: Normal  drive  mode
P: Power  drive  mode

Amount  of
throttle
opening

Speed

mph(km/h)

N P

P

P

N

N

AUTOMATIC TRANSMISSION (4L30-E) 7A1–11

GEAR SHIFT CONTROL

1

Shift pattern

2

Gear position

The gear is selected by ON/OFF of two solenoids.

3

Selecting gear position

Seven types of positions can be selected according to 5 signals from the mode switch as shown
below.

SELECT LEVER RANGE

SHIFT PATTERN

D (Drive)

1

2TCC

3TCC

4TCC

3 (Third)

1

2TCC

3TCC

4TCC

2 (Second)

1

2TCC

3TCC

L (First)

1

2

→

←

→

←

←

←

←

→

←

→

←

→

←

→

←

TCC = Torque Converter Clutch

GEAR

SOL

A

B

4 (Fourth)

✕

✕

3 (Third)

●

●

✕

2 (Second)

●

●

●

●

1 (First)

✕

●

●

P (Park)
R (Reverse)

✕

●

●

N (Neutral)

●

●

=  ON

✕ =  OFF

SOLENOID A

ON 

→

PRESSURE TO

(Normally closed)

SHIFT VALVE

SOLENOID B

OFF 

→

PRESSURE TO

(Normally open)

SHIFT VALVE

MODE SW TERMINALS

SELECT LEVER RANGE

5(D) 8(A) 7(B) 6(C) 3(G)

P (Park)

•

•

•

R (Reverse)

•

•

•

N (Neutral)

•

•

•

D (Drive)

•

•

•

3 (Third)

•

•

•

•

•

2 (Second)

•

•

•

L (First)

•

•

•

•

= Continuity