Infiniti FX35, FX50 (S51). Manual - part 1858

SHIFT MECHANISM

TM-239

< SYSTEM DESCRIPTION >

[7AT: RE7R01B (VK50VE)]

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

• Each planetary gear enters the state described below.

Front planetary gear

Under drive planetary gear

Rear planetary gear

Mid planetary gear

Component Parts Location

INFOID:0000000005250214

Refer to 

TM-215, "Cross-Sectional View"

.

Component Description

INFOID:0000000005250215

Name

Front sun gear

Front carrier

Front internal gear

Condition

—

Output

Input

Direction of rotation

Counterclockwise revolution

Clockwise revolution

Clockwise revolution

Number of revolutions

Deceleration from front internal 

gear

Deceleration from front internal 

gear

Same number of revolution as the 

input shaft

Name

Under drive sun gear

Under drive carrier

Under drive internal gear

Condition

—

Fixed

Input/Output

Direction of rotation

Counterclockwise revolution

—

Clockwise revolution

Number of revolutions

Acceleration from under drive inter-

nal gear

—

Same number of revolution as the 

front carrier

Name

Rear sun gear

Rear carrier

Rear internal gear

Condition

Output

Fixed

Input

Direction of rotation

Counterclockwise revolution

—

Clockwise revolution

Number of revolutions

Acceleration from rear internal 

gear

—

Same number of revolution as the 

under drive internal gear

Name

Mid sun gear

Mid carrier

Mid internal gear

Condition

Input

Output

Fixed

Direction of rotation

Counterclockwise revolution

Counterclockwise revolution

—

Number of revolutions

Same number of revolution as the 

rear sun gear

Deceleration from mid sun gear

—

Name of the Part (Abbreviation)

Function

Front brake (FR/B)

Fastens the under drive carrier.

Input clutch (I/C)

Connects the mid internal gear and the rear carrier.

Direct clutch (D/C)

Connects the rear carrier and the rear sun gear.

High and low reverse clutch (HLR/C)

Connects the rear sun gear and the mid sun gear.

Reverse brake (R/B)

Fastens the rear carrier.

Low brake (L/B)

Fastens the mid sun gear.

2346 brake (2346/B)

Fastens the under drive sun gear.

1st one-way clutch (1st OWC)

Allows the under drive carrier to turn freely in the forward direction but fastens it for reverse 
rotation.

2nd one-way clutch (2nd OWC)

Allows the rear sun gear to turn freely in the forward direction but fastens it for reverse ro-
tation.

Torque converter

Amplifies driving force the engine, and transmits it to transmission input shaft.

Oil pump

Driven by the engine, oil pump supplies oil to torque converter, control valve assembly, and 
each lubricating system.

TM-240

< SYSTEM DESCRIPTION >

[7AT: RE7R01B (VK50VE)]

SHIFT LOCK SYSTEM

SHIFT LOCK SYSTEM

System Description

INFOID:0000000005530869

• Shift lock prevents an unintentional start of the vehicle that may be caused by an incorrect operation while

selector lever is in the “P” position.

• Selector lever can be shifted from the “P” position to another position when the following conditions are sat-

isfied.

- Ignition switch ON
- Stop lamp switch is ON (brake pedal is depressed)
- Selector lever knob button is pressed

SHIFT LOCK OPERATION AT “P” POSITION

When Brake Pedal Is Not Depressed (No Shift Operation Allowed)

The shift lock solenoid (A) inside the shift lock unit is not energized if
the brake pedal is not depressed while the ignition switch is ON.
The lock plate (B) lowers according to the downward movement of
the position pin (C) when the selector button (D) is pressed, and
presses only slider B (E) into the shift lock unit. Slider A (F) located
below the lock plate prevents the downward movement of the lock
plate with the spring force. The selector lever cannot be shifted from
the “P” position for this reason.
However, slider A is forcibly pressed into the shift lock unit, allowing
the selector lever to shift if the shift lock release button is pressed.

When Brake Pedal Is Depressed (Shift Operation Allowed)

The shift lock solenoid (A) inside the shift lock unit is energized and
the relative positions of sliders A (B) and B (C) are maintained when
the brake pedal is depressed while the ignition switch is ON.
The lock plate (D) lowers according to the downward movement of
the position pin (E), thrusting away sliders A and B, when the selec-
tor button (F) is pressed.
The position pin lowers to the position that allows shift operation for
this reason. As a result, the selector lever can be shifted out of the P
position.

OPERATION AT OTHER THAN “P” POSITION

The shift lock function will not operate at any position other than “P”
because the lock plate (A) is only set for the “P” position. Accord-
ingly, the selector lever can be shifted to any position regardless of
the brake operation.
The position pin (B) enters the “P” position thrusting away the lock
plate when the selector lever is shifted to the “P” position. Then, the
shift mechanism is locked when the selector button (C) is released.

“P” POSITION RETAINING MECHANISM (IGNITION SWITCH LOCK)

When ignition switch is not in the ON position, power is not applied to the shift lock solenoid in the shift lock
unit. This causes shift lock state, and then “P” position is retained.
When an actuating system in the shift lock unit has a malfunction, selector lever is unable to operate from the
“P” position even when pressing the brake pedal with the ignition switch ON. However, when pressing the shift
lock release button, slider A is forcibly pressed into the shift lock unit. This allows shift lock to be released and
selector lever enables the select operation from the “P” position.

CAUTION:

JSDIA0119ZZ

JSDIA0120ZZ

JSDIA0121ZZ

SHIFT LOCK SYSTEM

TM-241

< SYSTEM DESCRIPTION >

[7AT: RE7R01B (VK50VE)]

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

Never use the shift lock release button except when the select lever is inoperative even when pressing
the brake pedal with the ignition switch ON.

Component Parts Location

INFOID:0000000005530870

*: Shift lock release button becomes operative by removing shift lock cover.

Component Description

INFOID:0000000005530871

1.

Position pin

2.

Shift lock unit

3.

Shift lock solenoid

4.

Slider A

5.

A/T shift selector connector

6.

Lock plate

7.

Slider B

8.

Stop lamp switch

9.

Brake pedal

10. Shift lock cover *

A.

A/T shift selector assembly

B.

Brake pedal, upper

C.

Center console

JSDIA1461ZZ

Component

Function

Shift lock unit

Shift lock solenoid

Activated by the ignition switch and stop lamp signals, it holds the relative 
positions of sliders A and B.

Lock plate

Restricts position pin moving.

Shift lock release button

Pressing the shift lock release button cancels the shift lock forcibly.

Position pin

Links with selector knob button and restricts selector lever shift operation.

Stop lamp switch

• When brake pedal is depressed, stop lamp switch turns ON.
• When stop lamp switch turns ON, power is supplied to shift lock unit.

TM-242

< SYSTEM DESCRIPTION >

[7AT: RE7R01B (VK50VE)]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

ON BOARD DIAGNOSTIC (OBD) SYSTEM

Diagnosis Description

INFOID:0000000005250219

The A/T system has two self-diagnostic systems.
The first is the emission-related on board diagnostic system (OBD-II) performed by the TCM in combination
with the ECM. A malfunction is indicated by the MIL (malfunction indicator lamp) and is stored as a DTC in the
ECM memory and in the TCM memory.
The second is the TCM original self-diagnosis indicated by the TCM. A malfunction history is stored in the
TCM memory. The detected items are overlapped with OBD-II self-diagnostic items. For details, refer to 

EC-

1179, "DTC Index"

.

OBD FUNCTION

The ECM provides emission-related on board diagnostic (OBD-II) functions for the A/T system.
One function is to receive a signal from the TCM used with OBD-related parts of the A/T system. The signal is
sent to the ECM when a malfunction occurs in the corresponding OBD-related part.
The other function is to indicate a diagnostic result by means of the MIL (malfunction indicator lamp) on the
instrument panel. Sensors, switches and solenoid valves are used as sensing elements.
The MIL automatically illuminates in “One or Two Trip Detection Logic” when a malfunction is sensed in rela-
tion to A/T system parts. For details, refer to 

EC-705, "Diagnosis Description"

.