Nissan Pathfinder (2008 year). Manual — part 583

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:0000000001714419

INTRODUCTION

The TCM receives a signal from the vehicle speed sensor, accelera-
tor pedal position sensor (throttle position sensor) or PNP 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-III (or GST) or a circuit tester connected should be
performed. 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

1.

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.

2.

CHECK SYMPTOM 1

Check the following items based on the information obtained from the customer.
• Fail-safe. Refer to

TM-121, "Fail-Safe"

.

• A/T fluid inspection. Refer to

TM-180, "Checking the A/T Fluid (ATF)"

.

• Stall test. Refer to

TM-186, "Stall Test"

.

• Line pressure test. Refer to

TM-187, "Line Pressure Test"

.

SAT631IB

SAT632I

SEF234G

DIAGNOSIS AND REPAIR WORKFLOW

TM-7

< BASIC INSPECTION >

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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-33, "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-190, "Check Before Engine Is Started"

.

>> 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:0000000001714420

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-8

< BASIC INSPECTION >

DIAGNOSIS AND REPAIR WORKFLOW

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

❏

Cannot be changed to manual mode

❏

Others

(

)

AT CHECK Malfunction indicator
lamp (MIL)

❏

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 complaint.

TM-121

2

❏

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

❏

A/T fluid inspection

TM-180

❏

Leak (Repair leak location.)

❏

State

❏

Amount

3

❏

Stall test

TM-186

❏

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-187

4

❏

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

TM-35

5

❏

Perform road test.

5-1

❏

Check before engine is started

TM-190

5-2

❏

Check at idle

TM-190

5-3

Cruise test

❏

Part 1

TM-191

❏

Part 2

TM-193

❏

Part 3

TM-194

❏

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

Refer to

TM-152, "Symptom Chart"

.

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-33

A/T CONTROL SYSTEM

TM-9

< FUNCTION DIAGNOSIS >

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FUNCTION DIAGNOSIS

A/T CONTROL SYSTEM

Cross-Sectional View

INFOID:0000000001282728

2WD models

SCIA5267E

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

TM-10

< FUNCTION DIAGNOSIS >

A/T CONTROL SYSTEM

4WD models

Shift Mechanism

INFOID:0000000001282729

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

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

A/T CONTROL SYSTEM

TM-11

< FUNCTION DIAGNOSIS >

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FUNCTION OF CLUTCH AND BRAKE

CLUTCH AND BAND CHART

1.

Front brake

2.

Input clutch

3.

Direct clutch

4.

High and low reverse clutch

5.

Reverse brake

6.

Forward brake

7.

Low coast brake

8.

1st one-way clutch

9.

Forward one-way clutch

10. 3rd one-way clutch

11.

Front sun gear

12. Input shaft

13. Mid internal gear

14.

Front internal gear

15. Rear carrier

16. Rear sun gear

17.

Mid sun gear

18. Front carrier

19. Mid carrier

20.

Rear internal gear

21. Output shaft

22. Parking gear

23.

Parking pawl

PCIA0002J

Name of the Part

Abbreviation

Function

Front brake (1)

FR/B

Fastens the front sun gear (11).

Input clutch (2)

I/C

Connects the input shaft (12), the front internal gear (14) and the mid internal
gear (13).

Direct clutch (3)

D/C

Connects the rear carrier (15) and the rear sun gear (16).

High and low reverse clutch (4)

HLR/C

Connects the mid sun gear (17) and the rear sun gear (16).

Reverse brake (5)

R/B

Fastens the rear carrier (15).

Forward brake (6)

Fwd/B

Fastens the mid sun gear (17).

Low coast brake (7)

LC/B

Fastens the mid sun gear (17).

1st one-way clutch (8)

1st WOC

Allows the rear sun gear (16) to turn freely forward relative to the mid sun gear
(17) but fastens it for reverse rotation.

Forward one-way clutch (9)

Fwd OWC

Allows the mid sun gear (17) to turn freely in the forward direction but fastens it
for reverse rotation.

3rd one-way clutch (10)

3rd OWC

Allows the front sun gear (11) to turn freely in the forward direction but fastens
it for reverse rotation.

Shift position

I/C

HLR/C

D/C

R/B

FR/B

LC/B

Fwd/B

1st

OWC

Fwd

OWC

3rd

OWC

Remarks

P

PARK POSITION

R

REVERSE POSI-

TION

TM-12

< FUNCTION DIAGNOSIS >

A/T CONTROL SYSTEM

•

—Operates

•

—Operates during “progressive” acceleration.

•

—Operates and effects power transmission while coasting.

•

—Line pressure is applied but does not affect power transmission.

•

—Operates under conditions shown in HLR/C Operating Condition

•

—Operates under conditions shown in LC/B Operating Condition. Delay control is applied during D (4,3,2,1)

⇒

N shift.

• *1: A/T will not shift to 5th when overdrive control switch is set in “OFF” position.

POWER TRANSMISSION

“N” Position

Since both the forward brake and the reverse brake are released, torque from the input shaft drive is not trans-
mitted to the output shaft.

“P” Position

• The same as for the “N” position, both the forward brake and the reverse brake are released, so torque from

the input shaft drive is not transmitted to the output shaft.

N

NEUTRAL POSI-

TION

D*1

1st

Automatic shift

1

⇔

2

⇔

3

⇔

4

⇔

5

2nd

3rd

4th

5th

3

1st

Automatic shift

1

⇔

2

⇔

3

⇐

4

2nd

3rd

4th

2

1st

Automatic shift

1

⇔

2

⇐

3

⇐

4

2nd

3rd

4th

1

1st

Locks (held sta-

tionary in 1st

gear)

1

⇐

2

⇐

3

⇐

4

2nd

3rd

4th

Shift position

I/C

HLR/C

D/C

R/B

FR/B

LC/B

Fwd/B

1st

OWC

Fwd

OWC

3rd

OWC

Remarks

SCIA5642E

A/T CONTROL SYSTEM

TM-13

< FUNCTION DIAGNOSIS >

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• The parking pawl linked with the select lever meshes with the parking gear and fastens the output shaft

mechanically.

“D”, “3” and “2” Positions 1st Gear

• The forward brake and the forward one-way clutch regulate reverse rotation of the mid sun gear.
• The 1st one-way clutch regulates reverse rotation of the rear sun gear.
• The 3rd one-way clutch regulates reverse rotation of the front sun gear.
• During deceleration, the mid sun gear turns forward, so the forward one-way clutch idles and the engine

brake is not activated.

1.

Front brake

2.

Input clutch

3.

Direct clutch

4.

High and low reverse clutch

5.

Reverse brake

6.

Forward brake

7.

Low coast brake

8.

1st one-way clutch

9.

Forward one-way clutch

10. 3rd one-way clutch

11.

Front sun gear

12. Input shaft

13. Mid internal gear

14. Front internal gear

15. Rear carrier

16. Rear sun gear

17. Mid sun gear

18. Front carrier

19. Mid carrier

20. Rear internal gear

21. Output shaft

22. Parking gear

23. Parking pawl

PCIA0003J