Nissan Pathfinder (2007 year). Instruction — part 10
TROUBLE DIAGNOSIS
AT-51
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2007 Pathfinder
Schematic
ECS00EF5
BCWA0575E
AT-52
TROUBLE DIAGNOSIS
2007 Pathfinder
Inspections Before Trouble Diagnosis
ECS00EF6
A/T FLUID CHECK
Fluid Leakage and Fluid Level Check
●
Inspect for fluid leakage and check the fluid level. Refer to
AT-14, "Changing the A/T Fluid (ATF)"
.
Fluid Condition Check
Inspect the fluid condition.
STALL TEST
Stall Test Procedure
1.
Inspect the amount of engine oil. Replenish the engine oil if necessary.
2.
Drive for about 10 minutes to warm up the vehicle so that the A/
T fluid temperature is 50 to 80
°
C (122 to 176
°
F). Inspect the
amount of ATF. Replenish if necessary.
3.
Securely engage the parking brake so that the tires do not turn.
4.
Engine start, apply foot brake, and place selector lever in “D”
position.
5.
While holding down the foot brake, gradually press down the
accelerator pedal.
6.
Quickly read off the stall speed, then quickly remove your foot
from the accelerator pedal.
CAUTION:
Do not hold down the accelerator pedal for more than 5 sec-
onds during this test.
Fluid condition
Conceivable Cause
Required Operation
Varnished (viscous
varnish state)
Clutch, brake
scorched
Replace the ATF and check the A/T
main unit and the vehicle for mal-
functions (wire harnesses, cooler
pipes, etc.)
Milky white or
cloudy
Water in the fluid
Replace the ATF and check for
places where water is getting in.
Large amount of
metal powder mixed
in
Unusual wear of
sliding parts within
A/T
Replace the ATF and check for
improper operation of the A/T.
SAT638A
SAT647B
SCIA7463E
Stall speed:
2,200 - 2,500 rpm
SAT514G
TROUBLE DIAGNOSIS
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2007 Pathfinder
7.
Move the selector lever to the “N” position.
8.
Cool down the ATF.
CAUTION:
Run the engine at idle for at least one minute.
9.
Repeat steps 5 through 8 with selector lever in “3”, “2”, “1” and “R” positions.
Judgement of Stall Test
O: Stall speed within standard value position
H: Stall speed higher than standard value
L: Stall speed lower than standard value
Stall test standard value position
LINE PRESSURE TEST
Line Pressure Test Port
Line Pressure Test Procedure
1.
Inspect the amount of engine oil and replenish if necessary.
2.
Drive the car for about 10 minutes to warm it up so that the ATF reaches in range of 50 to 80
°
C (122 to
176
°
F), then inspect the amount of ATF and replenish if necessary.
NOTE:
The automatic fluid temperature rises in range of 50 to 80
°
C (122 to 176
°
F) during 10 minutes of
driving.
Selector lever position
Expected problem location
D, 3, 2, 1
R
Stall rotation
H
O
●
Forward brake
●
Forward one-way clutch
●
1st one-way clutch
●
3rd one-way clutch
O
H
●
Reverse brake
L
L
●
Engine and torque converter one-way clutch
H
H
●
Line pressure low
Does not shift-up D position 1
→
2
Slipping in 2nd, 3rd, 4th gears
Direct clutch slippage
Does not shift-up D position 2
→
3
Slipping in 3rd, 4th, 5th gears
High and low reverse clutch slippage
Does not shift-up D position 3
→
4
Slipping in 4th, 5th gears
Input clutch slippage
Does not shift-up D position 4
→
5
Slipping in 5th gear
Front brake slippage
SCIA2187E
AT-54
TROUBLE DIAGNOSIS
2007 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
.
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
SCIA7463E
: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
425-465 (4.3 - 4.7, 62 - 67)
379 - 428 (3.9 - 4.4, 55 - 62)
At stall speed
1,605 - 1,905 (16.4 - 19.9, 233 - 283)
1,310 - 1,500 (13.4 - 15.3, 190 - 218)
TROUBLE DIAGNOSIS
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2007 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
.
2.
Check at idle. Refer to
3.
Cruise test
●
Inspect all the items from Part 1 to Part 3. Refer to
●
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.
AT-56
TROUBLE DIAGNOSIS
2007 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
>> 1. Turn ignition switch “OFF”.
2. Perform self-diagnostics and record all NG items on the
. Refer to
AT-88, "SELF-DIAGNOSTIC RESULT MODE"
AT-95, "Diagnostic Procedure With-
.
3. Go to
.
NO
>> Stop the test and go to
AT-177, "O/D OFF Indicator Lamp Does Not Come On"
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-178, "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-178, "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.
TROUBLE DIAGNOSIS
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2007 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
,
.
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.
AT-58
TROUBLE DIAGNOSIS
2007 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-62, "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-62, "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-62, "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-62, "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.
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