2003 NISSAN X-TRAIL low oil pressure

AT-236
[EURO-OBD]
TROUBLE DIAGNOSES FOR SYMPTOMS
4.CHECK A/T FLUID CONDITION
1. Remove oil pan.
2. Check A/T fluid condition.
OK or NG
OK >> GOTO5
NG >> 1. Disassemble A/T.
2. Check the following items:
–Forwardclutchassembly
–Overrunclutchassembly
–Reverse clutch assembly
5.CHECK SYMPTOM
Check again.
OK or NG
OK >>INSPECTION END
NG >> 1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
5. Large Shock. “N”®“R” PositionECS004SY
SYMPTOM:
There is large shock when changing from “N” to “R” position.
1.CHECK SELF-DIAGNOSTIC RESULTS
Does self-diagnosis show damage to A/T fluid temperature sensor,
line pressure solenoid valve or throttle position sensor circuit?
Ye s o r N o
Ye s > >lCheck damaged circuit. Refer to the following items.
Except for Euro-OBD
–LINE PRESSURE SOLENOID VALVE:AT-436, "LINE
PRESSURE SOLENOID VALVE"
–THROTTLE POSITION SENSOR:AT-401, "ACCELE
RATOR PEDAL POSITION (APP) SENSOR"
–BATT/FLUID TEMP SEN (A/T FLUID TEMP SEN-
SOR CIRCUIT AND TCM POWER SOURCE:AT-
426, "BATT/FLUID TEMP SEN (A/T FLUID TEMP SENSOR CIRCUIT AND TCM POWER
SOURCE)"
Euro-OBD
–LINE PRESSURE SOLENOID VALVE:AT-186, "DTC P0745 LINE PRESSURE SOLENOID
VA LV E"
–THROTTLE POSITION SENSOR:AT-203, "DTC P1705 ACCELERATOR PEDAL POSITION
(APP) SENSOR"
–BATT/FLUID TEMP SEN (A/T FLUID TEMP SENSOR CIRCUIT AND TCM POWER SOURCE:
AT - 2 1 6 , "
DTC BATT/FLUID TEMP SEN (A/T FLUID TEMP SENSOR CIRCUIT AND TCM
POWER SOURCE)"
No >> GOTO2
SAT171B
SCIA0769E

AT-238
[EURO-OBD]
TROUBLE DIAGNOSES FOR SYMPTOMS
2.CHECK STALL TEST
Check stall revolution with selector lever in “1” and “R” positions.
Refer toAT-65, "
Stall Te st".
OK or NG
OK >> GOTO3
OK in “1” position, NG in “R” position>>1.Remove control valve
assembly. Refer to “ON-VEHICLE SERVICE”,AT-
453, "Installation".
2. Check the following items:
–Valves to control line pressure (Pressure regulator
valve, pressure modifier valve, pilot valve and pilot fil-
ter)
–Line pressure solenoid valve (AT-436, "LINE PRES-
SURE SOLENOID VALVE": Except for Euro-OBDAT-186, "DTC P0745 LINE PRESSURE
SOLENOID VALVE": Euro-OBD)
3. Disassemble A/T.
4. Check the following items:
–Oil pump assembly
–Torque converter
–Reverse clutch assembly
–High clutch assembly
–Low & reverse brake assembly
–Low one-way clutch
NG in both “1” and “R” positions>>GOTO6
3.CHECK LINE PRESSURE
Check line pressure at idle with selector lever in “R” position. Refer
to “Line Pressure Test”,AT-68, "
Line Pressure Test".
OK or NG
OK >> GOTO4
NG >> 1. Remove control valve assembly. Refer to “ON-VEHI-
CLE SERVICE”,AT-453, "
Installation".
2. Check the following items:
–Valves to control line pressure (Pressure regulator
valve, pressure modifier valve, pilot valve and pilot fil-
ter)
–Line pressure solenoid valve (AT-436, "LINE PRES-
SURE SOLENOID VALVE": Except for Euro-OBD/AT-186, "DTC P0745 LINE PRESSURE
SOLENOID VALVE": Euro-OBD)
3. Disassemble A/T.
4. Check the following item:
–Oil pump assembly
SAT493G
SAT494G

TROUBLE DIAGNOSES FOR SYMPTOMS
AT-239
[EURO-OBD]
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4.CHECKA/TFLUIDCONDITION
1. Remove oil pan.
2. Check A/T fluid condition.
OK or NG
OK >> GOTO5
NG >> GOTO6
5.CHECK SYMPTOM
Check again.
OK or NG
OK >>INSPECTION END
NG >> 1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
6.DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Refer to “ON-VEHICLE SERVICE”,AT-453, "
Installation".
2. Check the following items:
–Valves to control line pressure (Pressure regulator valve, pressure modifier valve, pilot valve and pilot fil-
ter)
–Line pressure solenoid valve (AT- 4 3 6 , "LINE PRESSURE SOLENOID VALVE": Except for Euro-OBD/AT-
186, "DTC P0745 LINE PRESSURE SOLENOID VALVE":Euro-OBD)
3. Disassemble A/T.
4. Check the following items:
–Oil pump assembly
–Torque converter
–Reverse clutch assembly
–High clutch assembly
–Low & reverse brake assembly
–Low one-way clutch
OK or NG
OK >> GOTO5
NG >> Repair or replace damaged parts.
SAT171B

AT-240
[EURO-OBD]
TROUBLE DIAGNOSES FOR SYMPTOMS
7. Vehicle Does Not Creep Forward In “D”, “2” Or “1” Position
ECS004T0
SYMPTOM:
Vehicle does not creep forward when selecting “D”, “2” or “1” position.
1.CHECK A/T FLUID LEVEL
Check A/T fluid level again.
OK or NG
OK >> GOTO2
NG >> Refill ATF.
2.CHECK STALL TEST
Check stall revolution with selector lever in “D” position. Refer to
“Stall Test”,AT - 6 5 , "
Stall Test".
OK or NG
OK >> GOTO3
NG >> GOTO6
3.CHECK LINE PRESSURE
Check line pressure at idle with selector lever in “D” position. Refer
to “Line Pressure Test ”,AT-68, "
Line Pressure Test".
OK or NG
OK >> GOTO4
NG >> 1. Remove control valve assembly. Refer toAT-453,
"Installation".
2. Check the following items:
–Valves to control line pressure (Pressure regulator
valve, pressure modifier valve, pilot valve and pilot fil-
ter)
–Line pressure solenoid valve (AT-436, "LINE PRES-
SURE SOLENOID VALVE": Except for Euro-OBD/AT-186, "DTC P0745 LINE PRESSURE
SOLENOID VALVE": Euro-OBD)
3. Disassemble A/T.
4. Check the following item:
–Oil pump assembly
SAT638A
SAT493G
SAT494G

TROUBLE DIAGNOSES FOR SYMPTOMS
AT-241
[EURO-OBD]
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4.CHECKA/TFLUIDCONDITION
1. Remove oil pan.
2. Check A/T fluid condition.
OK or NG
OK >> GOTO5
NG >> GOTO6
5.CHECK SYMPTOM
Check again.
OK or NG
OK >>INSPECTION END
NG >> 1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
6.DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Refer toAT-453, "
Installation".
2. Check the following items:
–Valves to control line pressure (Pressure regulator valve, pressure modifier valve, pilot valve and pilot fil-
ter)
–Line pressure solenoid valve (AT- 4 3 6 , "LINE PRESSURE SOLENOID VALVE": Except for Euro-OBD/AT-
186, "DTC P0745 LINE PRESSURE SOLENOID VALVE":Euro-OBD)
3. Disassemble A/T.
4. Check the following items:
–Oil pump assembly
–Forwardclutchassembly
–Forward one-way clutch
–Low one-way clutch
–Low & reverse brake assembly
–Torque converter
OK or NG
OK >> GOTO5
NG >> Repair or replace damaged parts.
SAT171B

TROUBLE DIAGNOSES FOR SYMPTOMS
AT-243
[EURO-OBD]
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4.CHECK LINE PRESSURE
Check line pressure at stall point with selector lever in “D” position.
Refer to “Line Pressure Test”,AT-68, "
Line Pressure Test".
OK or NG
OK >> GOTO5
NG >> GOTO8
5.CHECKA/TFLUIDCONDITION
1. Remove oil pan.
2. Check A/T fluid condition.
OK or NG
OK >> GOTO6
NG >> GOTO8
6.DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Refer to $$$$$.
2. Check the following items:
–Shift valve A
–Shift valve B
–Shift solenoid valve A
–Shift solenoid valve B
–Pilot valve
–Pilot filter
OK or NG
OK >> GOTO7
NG >> Repair or replace damaged parts.
7.CHECK SYMPTOM
Check again.
OK or NG
OK >>INSPECTION END
NG >> 1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
SAT494G
SAT171B

TROUBLE DIAGNOSIS — BASIC INSPECTION
AT-291
[EXC.F/EURO-OBD]
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5. Start engine and measure line pressure at idle and stall speed.
lWhen measuring line pressure at stall speed, follow the
stall test procedure.
Line pressure: Refer toAT-563, "
SERVICE DATA AND SPECIFI-
CATIONS (SDS)".
JUDGEMENT OF LINE PRESSURE TEST
Road TestECS004VU
DESCRIPTION
lThe purpose of the test is to determine overall performance of A/
T and analyze causes of problems.
lThe road test consists of the following three parts:
1. Check before engine is started
2. Check at idle
SAT493G
Judgement Suspected parts
At idleLine pressure is low in all positions.
lOil pump wear
lControl piston damage
lPressure regulator valve or plug sticking
lSpring for pressure regulator valve damaged
lFluid pressure leakage between oil strainer and pressure regulator valve
lClogged strainer
Line pressure is low in particular posi-
tion.
lFluid pressure leakage between manual valve and particular clutch
lFor example, line pressure is:
-Low in “R” and “1” positions, but
-Normal in “D” and “2” positions.
Therefore, fluid leakage exists at or around low and reverse brake circuit.
Refer to “CLUTCH AND BAND CHART”,AT-19, "
CLUTCH AND BAND
CHART".
Line pressure is high.
lMaladjustment of throttle position sensor
lA/T fluid temperature sensor damaged
lLine pressure solenoid valve sticking
lShort circuit of line pressure solenoid valve circuit
lPressure modifier valve sticking
lPressure regulator valve or plug sticking
lOpen in dropping resistor circuit
At stall
speedLine pressure is low.
lMaladjustment of throttle position sensor
lLine pressure solenoid valve sticking
lShort circuit of line pressure solenoid valve circuit
lPressure regulator valve or plug sticking
lPressure modifier valve sticking
lPilot valve sticking
SAT786A

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
AT-315
[EXC.F/EURO-OBD]
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Clutches or brakes slip somewhat in
starting.ON vehicle1. Fluid levelAT-286,
"FLUID
LEVEL
CHECK"
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2. Control cable adjustmentAT-456,
"Control
Cable
Adjustment"
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3. Throttle position sensor (Accelerator
pedal position (App) sensor) AdjustmentEC-154, "
DTC P0121 APP
SENSOR"
4. Line pressure testAT-290,"Line Pres-
sure Test"
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5. Line pressure solenoid valveAT-436,
"LINE
PRES-
SURE
SOLENOID
VA LV E"
AT-186,
"DTC P0745
LINE PRES-
SURE
SOLENOID
VA LV E"
6. Control valve assemblyAT-454,
"Control
Va lv e
Assembly
and Accu-
mulators"
¬
7. Accumulator N-DAT-454,
"Control
Va lv e
Assembly
and Accu-
mulators"
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OFF vehicle8. Forward clutchAT-512,
"Forward
and Overrun
Clutches"
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9. Reverse clutchAT-504,
"Reverse
Clutch"
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10. Low & reverse brakeAT-518,
"Low&
Reverse
Brake"
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11. Oil pumpAT-485, "
Oil
Pump"¬
12. Torque converterAT-465,
"Locations
of Adjusting
Shims, Nee-
dle Bear-
ings, Thrust
Washers
and Snap
Rings"
¬ Symptom Condition Diagnostic ItemReference Page
Except for
Euro-OBDEURO-OBD