Infiniti QX56 (JA60). Manual - part 926

TM-6

< BASIC INSPECTION >

DIAGNOSIS AND REPAIR WORKFLOW

>> 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-30, "OBD-II Diagnostic Trouble Code (DTC)"

.

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”.
Is 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-159, "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:0000000005148506

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)

DIAGNOSIS AND REPAIR WORKFLOW

TM-7

< BASIC INSPECTION >

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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-117

2

†

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

†

 A/T fluid inspection

TM-148

†

 Leak (Repair leak location.)

†

 State

†

 Amount

†

 Stall test

TM-155

†

 Torque converter one-way clutch

†

 Front brake

†

 High and low reverse 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-157

3

†

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

part.

TM-32

4

†

 Perform road test.

5-1

†

 Check before engine is started

TM-159

5-2

†

 Check at idle

TM-159

5-3

Cruise test

†

 Part 1

TM-160

†

 Part 2

TM-162

†

 Part 3

TM-162

†

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

Refer to 

TM-121, "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-30

TM-8

< FUNCTION DIAGNOSIS >

A/T CONTROL SYSTEM

FUNCTION DIAGNOSIS

A/T CONTROL SYSTEM

Cross-Sectional View (2WD models)

INFOID:0000000005148507

1.

Front planetary gear

2.

Mid planetary gear

3.

Rear planetary gear

4.

Direct clutch

5.

High and low reverse clutch

6.

Reverse brake

7.

Drum support

8.

Forward brake

9.

Low coast brake

10. Input shaft

11. Torque converter

12. Oil pump

13. Front brake

14. 3rd one-way clutch

15. Input clutch

16. 1st one-way clutch

17. Control valve with TCM

18. Forward one-way clutch

19. Rear extension

20. Output shaft

SCIA5267E

A/T CONTROL SYSTEM

TM-9

< FUNCTION DIAGNOSIS >

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Cross-Sectional View (4WD models)

INFOID:0000000005148508

Shift Mechanism

INFOID:0000000005148509

The automatic transmission uses compact triple planetary gear systems to improve power-transmission effi-

ciency, simplify construction and reduce weight.

It also employs an optimum shift control and super wide gear ratios. They improve starting performance and

acceleration during medium and high-speed operation.

CONSTRUCTION 

1.

Front planetary gear

2.

Mid planetary gear

3.

Rear planetary gear

4.

Direct clutch

5.

High and low reverse clutch

6.

Reverse brake

7.

Drum support

8.

Forward brake

9.

Low coast brake

10. Input shaft

11. Torque converter

12. Oil pump

13. Front brake

14. 3rd one-way clutch

15. Input clutch

16. 1st one-way clutch

17. Control valve with TCM

18. Forward one-way clutch

19. Adapter case

20. Output shaft

SCIA5268E