2003 NISSAN X-TRAIL low oil pressure

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
AT-335
[EXC.F/EURO-OBD]
D
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AT
Vehicle will not run in any position.ON vehicle1. Fluid levelAT-286,
"FLUID
LEVEL
CHECK"
¬
2. Control cable adjustmentAT-456,
"Control
Cable
Adjustment"
¬
3. Line pressure testAT-290,
"Line Pres-
sure Test"
¬
4. Line pressure solenoid valveAT-436,
"LINE
PRES-
SURE
SOLENOID
VA LV E"
AT-186,
"DTC P0745
LINE PRES-
SURE
SOLENOID
VA LV E"
OFF vehicle5. Oil pumpAT-485, "
Oil
Pump"¬
6. High clutchAT-507,
"High
Clutch"
¬
7. Brake bandAT-530,
"Band
Servo Pis-
ton Assem-
bly"
¬
8. Low & reverse brakeAT-518,
"Low&
Reverse
Brake"
¬
9. Torque converterAT-465,
"Locations
of Adjusting
Shims, Nee-
dle Bear-
ings, Thrust
Washers
and Snap
Rings"
¬
10. Parking componentsAT-461,
"Compo-
nents"
¬
Transmission noise in “D”, “2”, “1”
and “R” positions.ON vehicle 1. Fluid levelAT-286,
"FLUID
LEVEL
CHECK"
¬
OFF vehicle 2. 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

AT-358
[EXC.F/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” PositionECS004V6
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-360
[EXC.F/EURO-OBD]
TROUBLE DIAGNOSES FOR SYMPTOMS
2.CHECK STALL TEST
Check stall revolution with selector lever in “1” and “R” positions.
Refer toAT-287, "
Stall Test".
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-290, "
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-361
[EXC.F/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-362
[EXC.F/EURO-OBD]
TROUBLE DIAGNOSES FOR SYMPTOMS
7. Vehicle Does Not Creep Forward In “D”, “2” Or “1” Position
ECS004V8
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-287, "
Sta ll Tes t".
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-290, "
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-363
[EXC.F/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-365
[EXC.F/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-290, "
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

AT-436
[ALL]
LINE PRESSURE SOLENOID VALVE
LINE PRESSURE SOLENOID VALVE
PFP:31940
DescriptionECS004UF
The line pressure solenoid valve regulates the oil pump discharge
pressure to suit the driving condition in response to a signal sent
from the TCM.
The line pressure duty cycle value is not consistent when the
closed throttle position switch is “ON”. To confirm the line
pressure duty cycle at low pressure, the accelerator (throttle)
should be open until the closed throttle position switch is
“OFF”.
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Remarks: Specification data are reference values.
NOTE:
The line pressure duty cycle value is not consistent when the closed throttle position switch is “ON”. To confirm the line pressure duty
cycle at low pressure, the accelerator (throttle) should be open until the closed throttle position switch is “OFF”.
TCM TERMINALS AND REFERENCE VALUE
Remarks: Specification data are reference values.
ON BOARD DIAGNOSIS LOGIC
SELF-DIAGNOSIS CODE CONFIRMATION PROCEDURE
After the repair, perform the following procedure to confirm the malfunction is eliminated.
SCIA0735E
Monitor item Condition Specification
Line pressure solenoid valve dutySmall throttle opening
(Low line pressure)
¯
Large throttle opening
(High line pressure)Approximately 24%
¯
Approximately 95%
Te r m i -
nal No.Wire color Item ConditionJudgement stan-
dard
(Approx.)
1R/WLine pressure
solenoid valveWhen releasing accelerator pedal
after warming up engine.1.5 - 3.0V
When depressing accelerator pedal
fully after warming up engine.0V
2P/BLine pressure
solenoid valve
(with dropping
resistor)When releasing accelerator pedal
after warming up engine.5-14V
When depressing accelerator pedal
fully after warming up engine.0V
Diagnostic trouble code Malfunction is detected when... Check items (Possible cause)
: LINE PRESSURE S/V
TCM detects an improper voltage drop
when it tries to operate the solenoid valve.
lHarness or connectors
(The solenoid circuit is open or shorted.)
lLine pressure solenoid valve
: 10th judgement flicker