Infiniti EX37. Transaxle and Transmission (2013 year). Manual - part 4

SHIFT MECHANISM

TM-49

< SYSTEM DESCRIPTION >

[7AT: RE7R01A]

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• The input clutch gets engaged and connects the mid internal gear with the rear carrier.
• The direct clutch gets engaged and connects the rear sun gear with the rear carrier.
• The high and low reverse clutch gets engaged and connects the rear sun gear with the mid sun gear.
• Each planetary gear enters the state described below.

JSDIA0872GB

2013 EX

TM-50

< SYSTEM DESCRIPTION >

[7AT: RE7R01A]

SHIFT MECHANISM

Rear planetary gear

Mid planetary gear

“D

6

”, “DS

6

” and “M6” Positions

Name

Rear sun gear

Rear carrier

Rear internal gear

Condition

—

input/Output

—

Direction of rotation

Clockwise revolution

Clockwise revolution

Clockwise revolution

Number of revolutions

Same number of revolution as the 

rear carrier

Same number of revolution as the 

input shaft

Same number of revolution as the 

rear carrier

Name

Mid sun gear

Mid carrier

Mid internal gear

Condition

—

Output

Input

Direction of rotation

Clockwise revolution

Clockwise revolution

Clockwise revolution

Number of revolutions

Same number of revolution as the 

mid internal gear

Same number of revolution as the 

mid internal gear

Same number of revolution as the 

input shaft

2013 EX

SHIFT MECHANISM

TM-51

< SYSTEM DESCRIPTION >

[7AT: RE7R01A]

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• The front sun gear and the under drive sun gear are fixed by the 2346 brake.
• The input clutch gets engaged and connects the mid internal gear with the rear carrier.
• The high and low reverse clutch gets engaged and connects the rear sun gear with the mid sun gear.
• Each planetary gear enters the state described below.

JSDIA0873GB

2013 EX

TM-52

< SYSTEM DESCRIPTION >

[7AT: RE7R01A]

SHIFT MECHANISM

Front planetary gear

Rear planetary gear

Mid planetary gear

“D

7

”, “DS

7

” and “M7” Positions

Name

Front sun gear

Front carrier

Front internal gear

Condition

Fixed

Output

Input

Direction of rotation

—

Clockwise revolution

Clockwise revolution

Number of revolutions

—

Deceleration from front internal 

gear

Same number of revolution as the 

input shaft

Name

Rear sun gear

Rear carrier

Rear internal gear

Condition

—

Input/Output

Input

Direction of rotation

Clockwise revolution

Clockwise revolution

Clockwise revolution

Number of revolutions

Acceleration from rear carrier

Same number of revolution as the 

input shaft

Same number of revolution as the 

front carrier

Name

Mid sun gear

Mid carrier

Mid internal gear

Condition

—

Output

Input

Direction of rotation

Clockwise revolution

Clockwise revolution

Clockwise revolution

Number of revolutions

Acceleration from mid internal gear

Acceleration from mid internal gear

Same number of revolution as the 

input shaft

2013 EX

SHIFT MECHANISM

TM-53

< SYSTEM DESCRIPTION >

[7AT: RE7R01A]

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• The under drive carrier is fixed by the front brake.
• The input clutch gets engaged and connects the mid internal gear with the rear carrier.
• The high and low reverse clutch gets engaged and connects the rear sun gear with the mid sun gear.
• Each planetary gear enters state described below.

JSDIA0874GB

2013 EX

TM-54

< SYSTEM DESCRIPTION >

[7AT: RE7R01A]

SHIFT MECHANISM

Front planetary gear

Under drive planetary gear

Rear planetary gear

Mid planetary gear

“R” Position

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

—

Input/Output

Input

Direction of rotation

Clockwise revolution

Clockwise revolution

Clockwise revolution

Number of revolutions

Acceleration from rear carrier

Same number of revolution as the 

input shaft

Same number of revolution as the 

under drive internal gear

Name

Mid sun gear

Mid carrier

Mid internal gear

Condition

—

Output

Input

Direction of rotation

Clockwise revolution

Clockwise revolution

Clockwise revolution

Number of revolutions

Acceleration from mid internal gear

Acceleration from mid internal gear

Same number of revolution as the 

input shaft

2013 EX

SHIFT MECHANISM

TM-55

< SYSTEM DESCRIPTION >

[7AT: RE7R01A]

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• The 1st one-way clutch and the front brake regulate counterclockwise rotation of the under drive carrier.

NOTE:
The front brake operates at the fixed speed or less.

• The rear carrier and the mid internal gear are fixed by the reverse brake.
• The mid sun gear rotates at the same speed as the rear sun gear by operation of the 2nd one-way clutch

and the high and low reverse clutch.
NOTE:
The high and low reverse clutch operates at the fixed speed or less.

JSDIA0875GB

2013 EX

TM-56

< SYSTEM DESCRIPTION >

[7AT: RE7R01A]

SHIFT MECHANISM

• Each planetary gear enters the state described below.

Front planetary gear

Under drive planetary gear

Rear planetary gear

Mid planetary gear

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

—

2013 EX

SHIFT MECHANISM

TM-57

< SYSTEM DESCRIPTION >

[7AT: RE7R01A]

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Component Parts Location

INFOID:0000000008285760

1.

IPDM E/R
Refer to 

PCS-4, "Component Parts 

Location"

.

2.

ECM
Refer to 

EC-39, "Component Parts 

Location"

.

3.

BCM
Refer to 

BCS-9, "Component Parts 

Location"

.

4.

Accelerator pedal position sensor
Refer to 

EC-39, "Component Parts 

Location"

.

5.

Stop lamp switch
Refer to 

TM-60, "Component Parts 

Location"

.

6.

ABS actuator and electric unit (con-
trol unit)
Refer to 

BRC-13, "Component Parts 

Location"

.

7.

A/T CHECK indicator lamp
(On the combination meter)

8.

Shift position indicator
(On the combination meter)

9.

Yaw rate/side G sensor
Refer to 

BRC-13, "Component Parts 

Location"

.

10. Unified meter and A/C amp.

Refer to 

MWI-10, "METER SYSTEM 

: Component Parts Location"

.

11.

Joint connector

12. Output speed sensor

*1

13. Control valve & TCM

*2

14. Manual mode position select switch 

(shift-up)

15. Manual mode select switch

16. Manual mode position select switch 

(shift-down)

17. Shift position switch

18. Selector lever position indicator

A.

A/T assembly

B.

A/T shift selector assembly

C.

Center console

*1: Output speed sensor is installed in A/T assembly.

*2: Control valve & TCM is installed in A/T assembly.

JSDIA2909GB

2013 EX

TM-58

< SYSTEM DESCRIPTION >

[7AT: RE7R01A]

SHIFT MECHANISM

NOTE:

The following components are included in control valve & TCM.

• TCM

• Input speed sensor 1, 2

• A/T fluid temperature sensor

• Transmission range switch

• Direct clutch solenoid valve

• High and low reverse clutch solenoid valve

• Input clutch solenoid valve

• Front brake solenoid valve

• Low brake solenoid valve

• Anti-interlock solenoid valve

• 2346 brake solenoid valve

• Line pressure solenoid valve

• Torque converter clutch solenoid valve

Component Description

INFOID:0000000008285761

Name of the Part (Abbreviation)

Function

Front brake (FR/B)

Fastens the under drive carrier.

Input clutch (I/C)

Connects the input shaft, 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.

Bypass valve

Controls the flow rate of A/T fluid to fluid cooler according to the oil temperature.

2013 EX

SHIFT LOCK SYSTEM

TM-59

< SYSTEM DESCRIPTION >

[7AT: RE7R01A]

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SHIFT LOCK SYSTEM

System Description

INFOID:0000000008285762

• 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

2013 EX

TM-60

< SYSTEM DESCRIPTION >

[7AT: RE7R01A]

SHIFT LOCK SYSTEM

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:0000000008285763

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

Component Description

INFOID:0000000008285764

1.

Stop lamp switch

2.

Shift lock unit

3.

Shift lock solenoid

4.

Slider A

5.

A/T shift selector harness connector 6.

Lock plate

7.

Position pin

8.

Slider B

9.

Shift lock cover 

*

A.

Brake pedal, upper

B.

A/T shift selector assembly

C.

Center console

JPDIA1185GB

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.

2013 EX

SHIFT LOCK SYSTEM

TM-61

< SYSTEM DESCRIPTION >

[7AT: RE7R01A]

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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.

Component

Function

2013 EX

TM-62

< SYSTEM DESCRIPTION >

[7AT: RE7R01A]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

ON BOARD DIAGNOSTIC (OBD) SYSTEM

Diagnosis Description

INFOID:0000000008285765

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-

578, "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-135, "Diagnosis Description"

.

2013 EX

DIAGNOSIS SYSTEM (TCM)

TM-63

< SYSTEM DESCRIPTION >

[7AT: RE7R01A]

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DIAGNOSIS SYSTEM (TCM)

CONSULT Function

INFOID:0000000008285766

CONSULT APPLICATION ITEMS

*: Although “CALIB DATA” is selectable, do not use its.

SELF-DIAGNOSTIC RESULTS

Refer to 

TM-156, "DTC Index"

.

IGN Counter

The IGN counter is indicated in Freeze frame data (FFD) and indicates the number of times that the ignition
switch is turned ON after returning to the normal state from DTC.
• CAN malfunction
- The number is 0 when a malfunction is detected now.
- The number increases like 1 

→

 2 

→

 3...38 

→

 39 after returning to the normal condition whenever ignition

switch OFF 

→

 ON.

- The number is fixed to 39 until the self-diagnosis results are erased if it is over 39.
• Other than CAN malfunction
- The number is 0 when a malfunction is detected now.
- The number increases like 1 

→

 2 

→

 3...254 

→

 255 after returning to the normal condition whenever ignition

switch OFF 

→

 ON.

- The number is fixed to 255 until the self-diagnosis results are erased if it is over 255.

DATA MONITOR

NOTE:
The following table includes information (items) inapplicable to this vehicle. For information (items) applicable
to this vehicle, refer to CONSULT display items.

 X: Standard, —: Not applicable, 

: Option

Diagnostic test mode

Function

Self Diagnostic Results

Retrieve DTC from ECU and display diagnostic items.

Data Monitor

Monitor the input/output signal of the control unit in real time.

CAN Diagnosis

This mode displays a network diagnosis result about CAN by a diagram.

CAN Diagnostic Support 
Monitor

It monitors the status of CAN communication.

DTC work support

DTC reproduction procedure can be performed speedily and precisely.

ECU Identification

Display the ECU identification number (part number etc.) of the selected system.

CALIB DATA*

The calibration data status of TCM can be checked.

Monitored item (Unit)

Monitor Item Selection

Remarks

ECU IN-

PUT SIG-

NALS

MAIN SIG-

NALS

SELEC-

TION 

FROM 

ITEM

VHCL/S SE-A/T

(km/h or mph)

X

X

Displays the vehicle speed calculated by the 
TCM from the output shaft revolution.

ESTM VSP SIG

(km/h or mph)

X

—

Displays the vehicle speed signal received via 
CAN communication.

OUTPUT REV

(rpm) 

X

X

Displays the output speed calculated from the 
pulse signal of output speed sensor.

INPUT SPEED

(rpm) 

X

X

Displays the input speed calculated from front 
sun gear revolution and front carrier revolution.

F SUN GR REV

(rpm) 

—

—

Displays the front sun gear revolution calculat-
ed from the pulse signal of input speed sensor 
1.

2013 EX

TM-64

< SYSTEM DESCRIPTION >

[7AT: RE7R01A]

DIAGNOSIS SYSTEM (TCM)

F CARR GR REV

(rpm) 

—

—

Displays the front carrier gear revolution calcu-
lated from the pulse signal of input speed sen-
sor 2.

ENGINE SPEED

(rpm) 

X

X

Displays the engine speed received via CAN 
communication.

TC SLIP SPEED

(rpm) 

—

X

Displays the revolution difference between in-
put speed and engine speed.

ACCELE POSI

(0.0/8)

X

—

Displays the accelerator position estimated val-
ue received via CAN communication.

THROTTLE POSI

(0.0/8)

X

X

Displays the throttle position received via CAN 
communication.

ATF TEMP 1

(

°

C or 

°

F)

X

X

Displays the ATF temperature of oil pan calcu-
lated from the signal voltage of A/T fluid tem-
perature sensor.

ATF TEMP 2

(

°

C or 

°

F)

X

X

Displays the ATF temperature estimated value 
of torque converter outlet calculated from the 
signal voltage of A/T fluid temperature sensor.

ATF TEMP SE 1

(V)

—

—

Displays the signal voltage of A/T fluid temper-
ature sensor.

BATTERY VOLT

(V)

X

—

Displays the power supply voltage of TCM.

LINE PRES SOL

(A)

—

X

Displays the command current from TCM to the 
line pressure solenoid.

TCC SOLENOID

(A)

—

X

Displays the command current from TCM to the 
torque converter clutch solenoid.

L/B SOLENOID

(A)

—

X

Displays the command current from TCM to the 
low brake solenoid.

FR/B SOLENOID

(A)

—

X

Displays the command current from TCM to the 
front brake solenoid.

HLR/C SOL

(A)

—

X

Displays the command current from TCM to the 
high and low reverse clutch solenoid.

I/C SOLENOID

(A)

—

X

Displays the command current from TCM to the 
input clutch solenoid.

D/C SOLENOID

(A)

—

X

Displays the command current from TCM to the 
direct clutch solenoid.

2346/B SOL

(A)

—

X

Displays the command current from TCM to the 
2346 brake solenoid.

L/P SOL MON

(A)

—

—

Monitors the command current from TCM to the 
line pressure solenoid, and displays the moni-
tor value.

TCC SOL MON

(A)

—

—

Monitors the command current from TCM to the 
torque converter clutch solenoid, and displays 
the monitor value.

L/B SOL MON

(A)

—

—

Monitors the command current from TCM to the 
low brake solenoid, and displays the monitor 
value.

FR/B SOL MON

(A)

—

—

Monitors the command current from TCM to the 
front brake solenoid, and displays the monitor 
value.

Monitored item (Unit)

Monitor Item Selection

Remarks

ECU IN-

PUT SIG-

NALS

MAIN SIG-

NALS

SELEC-

TION 

FROM 

ITEM

2013 EX