Infiniti G37 Coupe. Manual - part 1306

DIAGNOSIS AND REPAIR WORK FLOW

TM-77

< BASIC INSPECTION >

[5AT: RE5R05A]

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>> GO TO 3.

3.

CHECK DTC

1.

Check DTC.

2.

Perform the following procedure if DTC is detected.

• Record DTC.
• Erase DTC. Refer to 

TM-108, "Diagnosis Description"

.

Is any DTC detected?

YES

>> GO TO 4.

NO

>> GO TO 6.

4.

PERFORM DIAGNOSTIC PROCEDURE

Perform “Diagnosis Procedure” for the displayed DTC.

>> GO TO 5.

5.

PERFORM DTC CONFIRMATION PROCEDURE

Perform “DTC CONFIRMATION PROCEDURE” for the displayed DTC.

Is any DTC detected?

YES

>> GO TO 4.

NO

>> GO TO 6.

6.

CHECK SYMPTOM 2

Try to confirm the symptom described by the customer.

Is any malfunction present?

YES

>> GO TO 7.

NO

>> INSPECTION END

7.

ROAD TEST

Perform “ROAD TEST”. Refer to 

TM-222, "Description"

.

>> GO TO 8.

8.

CHECK SYMPTOM 3

Try to confirm the symptom described by the customer.

Is any malfunction present?

YES

>> GO TO 2.

NO

>> INSPECTION END

Diagnostic Work Sheet

INFOID:0000000001672104

INFORMATION FROM CUSTOMER

KEY POINTS

• WHAT..... Vehicle and A/T model
• WHEN..... Date, Frequencies
• WHERE..... Road conditions
• HOW..... Operating conditions, Symptoms

Customer name

MR/MS

Model and Year

VIN

Trans. Model

Engine

Mileage

Malfunction Date

Manuf. Date

In Service Date

Frequency

❏

 Continuous

❏

 Intermittent (

times a day)

TM-78

< BASIC INSPECTION >

[5AT: RE5R05A]

DIAGNOSIS AND REPAIR WORK FLOW

DIAGNOSTIC WORK SHEET

Symptoms

❏

 Vehicle does not move.

(

❏

 Any position

❏

 Particular position)

❏

 No up-shift

(

❏

 1st 

→

 2nd

❏

 2nd 

→

 3rd

❏

 3rd 

→

 4th   

❏

 4th 

→

 5th)

❏

 No down-shift

(

❏

 5th 

→

 4th   

❏

 4th 

→

 3rd

❏

 3rd 

→

 2nd

❏

 2nd 

→

 1st)

❏

 Lock-up malfunction

❏

 Shift point too high or too low.

❏

 Shift shock or slip

(

❏

 N 

→

 D

❏

 N 

→

 R

❏

 Lock-up

❏

 Any drive position)

❏

 Noise or vibration

❏

 No kick down

❏

 No pattern select

❏

 Others

(

)

A/T CHECK indicator lamp

❏

 Continuously lit

❏

 Not lit

Malfunction indicator lamp (MIL)

❏

 Continuously lit

❏

 Not lit

1

❏

 Read the item on cautions concerning fail-safe and understand the customer's com-

plaint.

TM-184

2

❏

 A/T fluid inspection, stall test and line pressure test

❏

 A/T fluid inspection

TM-214

❏

 Leak (Repair leak location.)

❏

 State

❏

 Amount

❏

 Stall test

TM-219

❏

 Torque converter 

one-way clutch

❏

 Front brake

❏

 High and low re-

verse clutch

❏

 Low coast brake

❏

 Forward brake

❏

 Reverse brake

❏

 Forward one-way 

clutch

❏

 1st one-way 

clutch

❏

 3rd one-way 

clutch

❏

 Engine

❏

 Line pressure low

❏

 Except for input 

clutch and direct 
clutch, clutches and 
brakes OK

❏

 Line pressure test - Suspected part:

TM-220

3

❏

 Perform self-diagnosis. — Check detected items to repair or replace malfunctioning 

part.

TM-112

4

❏

 Perform road test.

5-1

❏

 Check before engine is started

TM-222

5-2

❏

 Check at idle

TM-222

5-3

Cruise test

❏

 Part 1

TM-223

❏

 Part 2

TM-224

❏

 Part 3

TM-224

❏

 Check malfunction phenomena to repair or replace malfunctioning part after completing all road tests.

Refer to 

TM-188, "Symptom Table"

.

5

❏

 Drive vehicle to check that the malfunction phenomenon has been resolved.

6

❏

 Erase the results of the self-diagnosis from the TCM and the ECM.

TM-108

A/T CONTROL SYSTEM

TM-79

< FUNCTION DIAGNOSIS >

[5AT: RE5R05A]

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FUNCTION DIAGNOSIS

A/T CONTROL SYSTEM

System Diagram

INFOID:0000000001672105

Without Paddle Shifter

With Paddle Shifter

JSDIA0122GB

JPDIA0049GB

TM-80

< FUNCTION DIAGNOSIS >

[5AT: RE5R05A]

A/T CONTROL SYSTEM

System Description

INFOID:0000000001672106

The A/T senses vehicle operating conditions through various sensors or signals. It always controls the opti-
mum shift position and reduces shifting and lock-up shocks.

TCM FUNCTION

The function of the TCM is to:
• Receive input signals transmitted from various switches and sensors.
• Determine required line pressure, shifting point, lock-up operation, engine brake operation, etc.
• Transmit required output signals to the respective solenoids.

Input/Output Signal of TCM

SENSORS (or SIGNALS)

⇒

TCM

⇒

ACTUATORS

PNP switch
Accelerator pedal position signal
Closed throttle position signal
Wide open throttle position signal
Engine speed signal
A/T fluid temperature sensor
Revolution sensor
Vehicle speed signal
Manual mode switch signal
Stop lamp switch signal
Turbine revolution sensor
ATF pressure switch

Shift control
Line pressure control
Lock-up control
Engine brake control
Timing control
Fail-safe control
Self-diagnosis
CONSULT-III communication 
line
Duet-EA control
CAN system

Input clutch solenoid valve 
Direct clutch solenoid valve 
Front brake solenoid valve
High and low reverse clutch sole-
noid valve
Low coast brake solenoid valve
Torque converter clutch solenoid 
valve
Line pressure solenoid valve
A/T CHECK indicator lamp
Back-up lamp relay
Starter relay

Control item

Line

pressure

control

Vehicle 

speed 

control

Shift     

control

Lock-up 

control

Engine 

brake 

control

Fail-safe 

function 

*3

Self-diag-

nostics 

function

Input

Accelerator pedal position signal

*5

X

X

X

X

X

X

X

Vehicle speed sensor A/T
(revolution sensor)

X

X

X

X

X

X

X

Vehicle speed sensor MTR

*1, *5

X

Closed throttle position signal

*5

X

*2

X

X

X

X

*4 

Wide open throttle position signal

*5

X

X

*4 

Turbine revolution sensor 1

X

X

X

X

X

Turbine revolution sensor 2
(for 4th speed only)

X

X

X

X

X

Engine speed signals

*5

X

X

X

X

X

X

X

Stop lamp switch signal

*5

X

X

X

X

*4 

A/T fluid temperature sensors 1, 2

X

X

X

X

X

X

ASCD or ICC 
sensor inte-
grated unit

Operation signal

*5

X

X

X

Overdrive cancel 

signal

(*5)

X