Nissan Pathfinder (2006 year). Instruction - part 8

TROUBLE DIAGNOSIS

AT-55

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AT

2006 Pathfinder

3.

After warming up remove the oil pressure detection plug and
install the oil pressure gauge [ST2505S001(J-34301-C)].

CAUTION:

When using the oil pressure gauge, be sure to use the O-
ring attached to the oil pressure detection plug.

4.

Securely engage the parking brake so that the tires do not turn.

5.

Start the engine, then measure the line pressure at both idle and
the stall speed.

CAUTION:

●

Keep the brake pedal pressed all the way down during
measurement.

●

 When measuring the line pressure at the stall speed,
refer to 

AT-53, "STALL TEST"

 .

6.

After the measurements are complete, install the oil pressure
detection plug and tighten to the regulation torque below.

CAUTION:

●

 Do not reuse the O-ring.

●

Apply ATF to O-ring.

Line Pressure

SCIA5309E

SCIA1224E

:7.3 N·m (0.74 kg-m, 65 in-lb)

SAT493G

Engine speed

Line pressure [kPa (kg/cm

2

 , psi)]

“R” position

“D” position

At idle speed

392 - 441 (4.0 - 4.5, 57 - 64)

373 - 422 (3.8 - 4.3, 54 - 61)

At stall speed

1,700 - 1,890 (17.3 - 19.3, 247 - 274)

1,310 - 1,500 (13.3 - 15.3, 190 - 218)

AT-56

TROUBLE DIAGNOSIS

2006 Pathfinder

Judgement of Line Pressure Test

ROAD TEST
Description

●

The road test inspects overall performance of the A/T and analyzes possible malfunction causes.

●

The road test is carried out in the following three stages.

1.

Check before engine is started. Refer to 

AT-57

 .

2.

Check at idle. Refer to 

AT-57

 .

3.

Cruise test

●

Inspect all the items from Part 1 to Part 3. Refer to 

AT-58

 , 

AT-60

 , 

AT-61

 .

●

Before beginning the road test, check the test procedure and inspection items.

●

Test all inspection items until the symptom is uncovered. Diagnose NG items when all road tests are com-
plete.

Judgement Possible 

cause

Idle speed

Low for all positions 
(P, R, N, D)

Possible causes include malfunctions in the pressure supply system and low oil pump output.
For example

●

Oil pump wear

●

Pressure regulator valve or plug sticking or spring fatigue

●

Oil strainer 

Þ

 oil pump 

Þ

 pressure regulator valve passage oil leak

●

Engine idle speed too low

Only low for a spe-
cific position

Possible causes include an oil pressure leak in a passage or device related to the position after 
the pressure is distributed by the instruction valve.

High

Possible causes include a sensor malfunction or malfunction in the line pressure adjustment func-
tion.
For example

●

Accelerator pedal position signal malfunction

●

ATF temperature sensor malfunction

●

Line pressure solenoid malfunction (sticking in “OFF” state, filter clog, cut line)

●

Pressure regulator valve or plug sticking

Stall speed

Oil pressure does 
not rise higher than 
the oil pressure for 
idle.

Possible causes include a sensor malfunction or malfunction in the pressure adjustment function.
For example

●

Accelerator pedal position signal malfunction

●

TCM breakdown

●

Line pressure solenoid malfunction (shorting, sticking in“ ON” state)

●

Pressure regulator valve or plug sticking

●

Pilot valve sticking or pilot filter clogged

The pressure rises, 
but does not enter 
the standard posi-
tion.

Possible causes include malfunctions in the pressure supply system and malfunction in the pres-
sure adjustment function.
 For example

●

Accelerator pedal position signal malfunction

●

Line pressure solenoid malfunction (sticking, filter clog)

●

Pressure regulator valve or plug sticking

●

Pilot valve sticking or pilot filter clogged

Only low for a spe-
cific position

Possible causes include an oil pressure leak in a passage or device related to the position after 
the pressure is distributed by the instruction valve.

TROUBLE DIAGNOSIS

AT-57

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2006 Pathfinder

Check Before Engine is Started

ECS00EF7

1. 

CHECK O/D OFF INDICATOR LAMP

1.

Park vehicle on level surface.

2.

Move selector lever to “P” position.

3.

Turn ignition switch to “OFF” position and wait at least 10 seconds.

4.

Turn ignition switch to “ON” position. (Do not start engine.)

Does O/D OFF indicator lamp light up for about 2 seconds?

YES

>> GO TO 2.

NO

>> 1. Turn ignition switch to “OFF” position.

2. Carry out the self-diagnostics and record all NG items on the diagnostics worksheet. Refer to

AT-90

 .

3. Go to 

AT-57, "Check at Idle"

 .

Check at Idle

ECS00EF8

1. 

CHECK STARTING THE ENGINE

1.

Park vehicle on level surface.

2.

Move selector lever to “P” or “N” position.

3.

Turn ignition switch to “OFF” position.

4.

Turn ignition switch to “START” position.

Does the engine start?

YES

>> GO TO 2.

NO

>> Stop the road test and go to 

AT-184, "Engine Cannot Be Started In “P” or “N” Position"

 .

2. 

CHECK STARTING THE ENGINE

1.

Turn ignition switch to “ON” position.

2.

Move selector lever in “D”, “3”, “2”, “1” or “R” position.

3.

Turn ignition switch to “START” position.

Does the engine start in either position?

YES

>> Stop the road test and go to 

AT-184, "Engine Cannot Be Started In “P” or “N” Position"

 .

NO

>> GO TO 3.

3. 

CHECK “P” POSITION FUNCTIONS

1.

Move selector lever to “P” position.

2.

Turn ignition switch to “OFF” position.

3.

Release the parking brake.

4.

Push the vehicle forward or backward.

5.

Engage the parking brake.

When you push the vehicle with disengaging the parking brake, does it move?

YES

>> Enter a check mark at “In “P” Position Vehicle Moves When Pushed” on the diagnostics work-

sheet, then continue the road test.

NO

>> GO TO 4. 

AT-58

TROUBLE DIAGNOSIS

2006 Pathfinder

4. 

CHECK “N” POSITION FUNCTIONS

1.

Start the engine.

2.

Move selector lever to “N” position.

3.

Release the parking brake.

Does vehicle move forward or backward?

YES

>> Enter a check mark at “In “N” Position Vehicle Moves” on the diagnostics worksheet, then con-

tinue the road test. 

NO

>>  GO TO 5.

5. 

CHECK SHIFT SHOCK

1.

Engage the brake.

2.

Move selector lever to “D” position.

When the transmission is shifted from “N” to “D”, is there an excessive shock?

YES

>> Enter a check mark at “Large Shock (“N” to “D” Position)” on the diagnostics worksheet, then con-

tinue the road test.

NO

>> GO TO 6.

6. 

CHECK “R” POSITION FUNCTIONS

1.

Engage the brake.

2.

Move selector lever to “R” position.

3.

Release the brake for 4 to 5 seconds.

Does the vehicle creep backward?

YES

>> GO TO 7.

NO

>> Enter a check mark at “Vehicle Does Not Creep Backward In “R” Position” on the diagnostics

worksheet, then continue the road test.

7. 

CHECK “D” POSITION FUNCTIONS 

Inspect whether the vehicle creep forward when the transmission is put into the “D” position.

Does the vehicle creep forward in the “D” positions?

YES

>> Go to 

AT-58, "Cruise Test - Part 1"

 , 

AT-60, "Cruise Test - Part 2"

 and 

AT-61, "Cruise Test - Part 3"

.

NO

>> Enter a check mark at “Vehicle Does Not Creep Forward In “D” Positions” on the diagnostics

worksheet, then continue the road test. 

Cruise Test - Part 1

ECS00EF9

1. 

CHECK STARTING OUT FROM D1

1.

Drive the vehicle for about 10 minutes to warm up the engine oil and ATF.
Appropriate temperature for the ATF: 50 - 80

°

C (122 - 176

°

F)

2.

Park the vehicle on a level surface.

3.

Move selector lever to “P” position.

4.

Start the engine.

5.

Set overdrive control switch to ON position.

6.

Move selector lever to “D” position.

7.

Press the accelerator pedal about half way down to accelerate the vehicle.

 With CONSULT-II

Read off the gear positions.

Starts from D1?

YES

>> GO TO 2.

NO

>> Enter a check mark at “Vehicle Cannot Be Started From D1” on the diagnostics worksheet, then

continue the road test.

TROUBLE DIAGNOSIS

AT-59

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2006 Pathfinder

2. 

CHECK SHIFT-UP D1 

→

 D2

Press down the accelerator pedal about half way and inspect if the vehicle shifts up (D1 

→

 D2) at the appropri-

ate speed.

●

Refer to 

AT-63, "Vehicle Speed at Which Gear Shifting Occurs"

 .

 With CONSULT-II

Read the gear position, throttle degree of opening, and vehicle speed.

Does the A/T shift-up D1 

→

 D2 at the correct speed?

YES

>> GO TO 3.

NO

>> Enter a check mark at “A/T Does Not Shift: D1 

→

 D2” on the diagnostics worksheet, then continue

the road test.

3. 

CHECK SHIFT-UP D2 

→

 D3

Press down the accelerator pedal about half way and inspect if the vehicle shifts up (D2 

→

 D3) at the appropri-

ate speed.

●

Refer to 

AT-63, "Vehicle Speed at Which Gear Shifting Occurs"

 .

 With CONSULT-II

Read the gear position, throttle degree of opening, and vehicle speed.
Does the A/T shift-up D2 

→

 D3 at the correct speed?

YES

>> GO TO 4.

NO

>> Enter a check mark at “A/T Does Not Shift: D2 

→

 D3” on the diagnostics worksheet, then continue

the road test.

4. 

CHECK SHIFT-UP D3 

→

 D4

Press down the accelerator pedal about half way and inspect if the vehicle shifts up (D3 

→

 D4) at the appropri-

ate speed.

●

Refer to 

AT-63, "Vehicle Speed at Which Gear Shifting Occurs"

 .

 With CONSULT-II

Read the gear position, throttle degree of opening, and vehicle speed.

Does the A/T shift-up D3 

→

 D4 at the correct speed?

YES

>> GO TO 5.

NO

>> Enter a check mark at “A/T Does Not Shift: D3 

→

 D4” on the diagnostics worksheet, then continue

the road test.

5. 

CHECK SHIFT-UP D4 

→

 D5

Press down the accelerator pedal about half way and inspect if the vehicle shifts up (D4 

→

 D5) at the appropri-

ate speed.

●

Refer to 

AT-63, "Vehicle Speed at Which Gear Shifting Occurs"

 .

 With CONSULT-II

Read the gear position, throttle degree of opening, and vehicle speed.

Does the A/T shift-up D4 

→

 D5 at the correct speed?

YES

>> GO TO 6.

NO

>> Enter a check mark at “A/T Does Not Shift: D4 

→

 D5” on the diagnostics worksheet, then continue

the road test.

AT-60

TROUBLE DIAGNOSIS

2006 Pathfinder

6. 

CHECK LOCK-UP 

When releasing accelerator pedal from D5 (closed throttle position signal: OFF), check lock-up from D5 to L/U.

●

Refer to 

AT-63, "Vehicle Speed at Which Gear Shifting Occurs"

 .

 With CONSULT-II

Select “TCC SOLENOID” with the “MAIN SIGNAL” mode for A/T.
Does it lock-up? 

YES

>> GO TO 7.

NO

>> Enter a check mark at “A/T Does Not Perform Lock-up” on the diagnostics worksheet, then con-

tinue the road test.

7. 

CHECK LOCK-UP HOLD

Check hold lock-up.

 With CONSULT-II

Select “TCC SOLENOID” with the “MAIN SIGNAL” mode for A/T.

Does it maintain lock-up status?

YES

>> GO TO 8.

NO

>> Enter a check mark at “A/T Does Not Hold Lock-up Condition” on the diagnostics worksheet, then

continue the road test.

8. 

CHECK LOCK-UP RELEASE

Check lock-up cancellation by depressing brake pedal lightly to decelerate.

 With CONSULT-II

Select “TCC SOLENOID” with the “MAIN SIGNAL” mode for A/T.
Does lock-up cancel?

YES

>> GO TO 9.

NO

>> Enter a check mark at “Lock-up Is Not Released” on the diagnostics worksheet, then continue the

road test.

9. 

CHECK SHIFT-DOWN D5 

→

 D4

Decelerate by pressing lightly on the brake pedal.

 With CONSULT-II

Read the gear position and engine speed.

When the A/T shift-down D5 

→

 D4, does the engine speed drop smoothly back to idle?

YES

>> 1.  Stop the vehicle.

2. Go to Cruise test - Part 2 (Refer to 

AT-60

 ).

NO

>> Enter a check mark at “Engine Speed Does Not Return to Idle” on the diagnostics worksheet, then

continue the road test. Go to Cruise test - Part 2 (Refer to 

AT-60

 ).

Cruise Test - Part 2

ECS00EFA

1. 

CHECK STARTING FROM D1

1.

Move selector lever to “D” position.

2.

Accelerate at half throttle.

 With CONSULT-II

Read the gear position.

Does it start from D1?

YES

>> GO TO 2.

NO

>> Enter a check mark at “Vehicle Cannot Be Started From D1” on the diagnostics worksheet, then

continue the road test.

TROUBLE DIAGNOSIS

AT-61

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2006 Pathfinder

2. 

CHECK SHIFT-UP D1 

→

 D2

Press the accelerator pedal down all the way and inspect whether or not the transmission shifts up (D1 

→

 D2)

at the correct speed.

●

Refer to 

AT-63, "Vehicle Speed at Which Gear Shifting Occurs"

 .

 With CONSULT-II

Read the gear position, throttle position and vehicle speed.

Does the A/T shift-up D1 

→

 D2 at the correct speed?

YES

>> GO TO 3.

NO

>> Enter a check mark at “A/T Does Not Shift: D1 

→

 D2” on the diagnostics worksheet, then continue

the road test.

3. 

CHECK SHIFT-UP D2 

→

 D3

Press the accelerator pedal down all the way and inspect whether or not the transmission shifts up (D2 

→

 D3)

at the correct speed.

●

Refer to 

AT-63, "Vehicle Speed at Which Gear Shifting Occurs"

 .

 With CONSULT-II

Read the gear position, throttle position and vehicle speed.
Does the A/T shift-up D2 

→

 D3 at the correct speed?

YES

>> GO TO 4.

NO

>> Enter a check mark at “A/T Does Not Shift: D2 

→

 D3” on the diagnostics worksheet, then continue

the road test.

4. 

CHECK SHIFT-UP D3 

→

 D4 AND ENGINE BRAKE

When the transmission changes speed D3 

→

 D4, return the accelerator pedal.

 With CONSULT-II

Read the gear position.

Does the A/T shift-up D3 

→

 D4 and apply the engine brake?

YES

>> 1. Stop the vehicle.

2. See 

AT-61, "Cruise Test - Part 3"

 .

NO 

>> Enter a check mark at “A/T Does Not Shift: D3 

→

 D4” on the diagnostics worksheet, then continue

the road test. 

Cruise Test - Part 3

ECS00EFB

1. 

CHECK SHIFT-DOWN

1.

Confirm overdrive control switch is ON position.

2.

Confirm gear selector lever is in “D” position.

3.

Accelerate vehicle using half-throttle to D

5

 .

4.

Release accelerator pedal.

5.

Set overdrive control switch to OFF position while driving in D

5

 .

 With CONSULT-II

Read the gear position.

Does A/T shift from D

5

  to D

4

  (O/D OFF)?

YES

>> GO TO 2.

NO

>> Enter a check mark at “A/T does not shift: 5th gear 

→

 4th gear” on the diagnostics worksheet,

then continue the road test.

AT-62

TROUBLE DIAGNOSIS

2006 Pathfinder

2. 

CHECK SHIFT-DOWN 

During D

4 

 driving, move gear selector from D 

→

 3 

→

 2 

→

 1. 

 With CONSULT-II

Read the gear position.

Is downshifting correctly performed?

YES

>> GO TO 3.

NO

>> Enter a check mark at “A/T does not shift” at the corresponding position (4th 

→

 3rd, 3rd 

→

 2nd,

2nd 

→

 1st) on the diagnostics worksheet, then continue the road test.

3. 

CHECK ENGINE BRAKE

Does engine braking effectively reduce speed in 1

1

  position?

YES

>> 1. Stop the vehicle.

2. Carry out the self-diagnostics. Refer to 

AT-90, "SELF-DIAGNOSTIC RESULT MODE"

 .

NO

>> Enter a check mark at “Vehicle Does Not Decelerate By Engine Brake” on the diagnostics work-

sheet, then continue trouble diagnosis.