Nissan Pathfinder (2012 year). Manual

TM-6

< BASIC INSPECTION >

DIAGNOSIS AND REPAIR WORKFLOW

BASIC INSPECTION

DIAGNOSIS AND REPAIR WORKFLOW

How to Perform Trouble Diagnosis for Quick and Accurate Repair

INFOID:0000000007357086

INTRODUCTION

The TCM receives a signal from the output speed sensor, accelera-

tor pedal position sensor (throttle position sensor) or transmission

range switch. Then provides shift control or lock-up control via A/T

solenoid valves.

The TCM also communicates with the ECM by means of a signal

sent from sensing elements used with the OBD-related parts of the

A/T system for malfunction-diagnostic purposes. The TCM is capa-

ble of diagnosing malfunctioning parts while the ECM can store mal-

functions in its memory.

Input and output signals must always be correct and stable in the

operation of the A/T system. The A/T system must be in good oper-

ating condition and be free of valve seizure, solenoid valve malfunc-

tion, etc.

It is much more difficult to diagnose an error that occurs intermit-

tently rather than continuously. Most intermittent errors are caused

by poor electric connections or improper wiring. In this case, careful

checking of suspected circuits may help prevent the replacement of

good parts.

A visual check only may not find the cause of the errors. A road test

with CONSULT (or GST) or a circuit tester connected should be per-

formed. Follow the “DETAILED FLOW”.

Before undertaking actual checks, take a few minutes to talk with a

customer who approaches with a driveability complaint. The cus-

tomer can supply good information about such errors, especially

intermittent ones. Find out what symptoms are present and under

what conditions they occur. A “Diagnostic work sheet” as shown on

the example (Refer to

TM-7

) should be used.

Start your diagnosis by looking for “conventional” errors first. This will

help troubleshoot driveability errors on an electronically controlled

engine vehicle.

Also check related Service bulletins.

DETAILED FLOW

COLLECT THE INFORMATION FROM THE CUSTOMER

Get the detailed information from the customer about the symptom (the condition and the environment when

the incident/malfunction occurred) using diagnosis worksheet. Refer to

TM-7, "Diagnostic Work Sheet"

>> GO TO 2.

CHECK SYMPTOM 1

Check the following items based on the information obtained from the customer.

• Fail-safe. Refer to

TM-113, "Fail-Safe"

• A/T fluid inspection. Refer to

TM-157, "Checking the A/T Fluid (ATF)"

• Stall test. Refer to

TM-163, "Stall Test"

• Line pressure test. Refer to

TM-164, "Line Pressure Test"

SAT631IB

SAT632I

SEF234G

August 2012

2012 Pathfinder

DIAGNOSIS AND REPAIR WORKFLOW

TM-7

< BASIC INSPECTION >

>> GO TO 3.

CHECK DTC

1. Check DTC.

2. Perform the following procedure if DTC is detected.

• Record DTC.

• Erase DTC. Refer to

TM-35, "OBD-II Diagnostic Trouble Code (DTC)"

Is any DTC detected?

YES

>> GO TO 4.

>> GO TO 6.

PERFORM DIAGNOSTIC PROCEDURE

Perform “Diagnosis Procedure” for the displayed DTC.

>> GO TO 5.

PERFORM DTC CONFIRMATION PROCEDURE

Perform “DTC CONFIRMATION PROCEDURE”.
Is DTC detected?

YES

>> GO TO 4.

>> GO TO 6.

CHECK SYMPTOM 2

Try to confirm the symptom described by the customer.
Is any malfunction present?

YES

>> GO TO 7.

>> INSPECTION END

ROAD TEST

Perform “ROAD TEST”. Refer to

TM-167, "Check Before Engine Is Started"

>> GO TO 8.

CHECK SYMPTOM 3

Try to confirm the symptom described by the customer.
Is any malfunction present?

YES

>> GO TO 2.

>> INSPECTION END

Diagnostic Work Sheet

INFOID:0000000007357087

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)

August 2012

2012 Pathfinder

TM-8

< BASIC INSPECTION >

DIAGNOSIS AND REPAIR WORKFLOW

DIAGNOSTIC WORK SHEET

Symptoms

Vehicle does not move. (

Any position

Particular position)

No up-shift (

1st

→

2nd

→

3rd

→

4th

→

5th)

No down-shift (

5th

→

4th

→

3rd

→

2nd

→

1st)

Lock-up malfunction

Shift point too high or too low.

Shift shock or slip (

→

Lock-up

Any drive position)

Noise or vibration

No kick down

No pattern select

Cannot be changed to manual mode

Others

(

)

A/T CHECK indicator lamp (with
manual mode)

Continuously lit

Not lit

O/D OFF indicator lamp (without
manual mode)

Continuously lit

Not lit

Malfunction indicator lamp (MIL)

Continuously lit

Not lit

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

TM-113

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

A/T fluid inspection

TM-157

Leak (Repair leak location.)

State

Amount

Stall test

TM-163

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-164

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

TM-37

Perform road test.

5-1

Check before engine is started

TM-167

5-2

Check at idle

TM-167

5-3

Cruise test

Part 1

TM-168

Part 2

TM-170

Part 3

TM-170

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

Refer to

TM-128, "Symptom Chart"

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

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

TM-35

August 2012

2012 Pathfinder

A/T CONTROL SYSTEM

TM-9

< SYSTEM DESCRIPTION >

SYSTEM DESCRIPTION

A/T CONTROL SYSTEM

Cross-Sectional View

INFOID:0000000007357088

2WD models

SCIA5267E

Front planetary gear

Mid planetary gear

Rear planetary gear

Direct clutch

High and low reverse clutch

Reverse brake

Drum support

Forward brake

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

August 2012

2012 Pathfinder

TM-10

< SYSTEM DESCRIPTION >

A/T CONTROL SYSTEM

4WD models

Shift Mechanism

INFOID:0000000007357089

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

SCIA5268E

Front planetary gear

Mid planetary gear

Rear planetary gear

Direct clutch

High and low reverse clutch

Reverse brake

Drum support

Forward brake

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

August 2012

2012 Pathfinder

Nissan Pathfinder (2012 year). Manual - part 572