2001 NISSAN X-TRAIL Line pressure

AT-100
[EURO-OBD]
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Races extremely fast or slips in
changing from “D
4 ” or “D3 ” to “D1 ”
when depressing pedal.ON vehicle1. Fluid levelAT- 6 3 , "
FLUID LEVEL
CHECK"
2. Accelerator pedal position (APP) sensorAT-180, "
DTC P1705
ACCELERATOR PEDAL
POSITION (APP) SEN-
SOR"
3. Line pressure testAT- 6 7 , "Line Pressure Test"
4. Line pressure solenoid valveAT-163, "
DTC P0745 LINE
PRESSURE SOLENOID
VA LV E"
5. Shift solenoid valve AAT-170, "
DTC P0750
SHIFT SOLENOID VALVE
A"
6. Shift solenoid valve BAT-175, "
DTC P0755
SHIFT SOLENOID VALVE
B"
7. Control valve assemblyAT-414, "
Control Valve
Assembly and Accumula-
tors"
OFF vehicle8. Forward clutchAT-471, "
Forward and
Overrun Clutches"
9. Forward one-way clutchAT-421, "OVERHAUL"
10. Low one-way clutchAT-421, "
OVERHAUL",AT-
425, "Locations of Adjust-
ing Shims, Needle Bear-
ings, Thrust Washers and
Snap Rings"
Vehicle will not run in any position.ON vehicle1. Fluid levelAT- 6 3 , "
FLUID LEVEL
CHECK"
2. Control cable adjustmentAT-416, "Control Cable
Adjustment"
3. Line pressure testAT- 6 7 , "Line Pressure Test"
4. Line pressure solenoid valveAT-163, "
DTC P0745 LINE
PRESSURE SOLENOID
VA LV E"
OFF vehicle5. Oil pumpAT-444, "
Oil Pump"
6. Torque converterAT-425, "
Locations of
Adjusting Shims, Needle
Bearings, Thrust Washers
and Snap Rings"
7. Parking componentsAT-421, "Components"
Transmission noise in “D”, “2”, “1”
and “R” positions.ON vehicle 1. Fluid levelAT- 6 3 , "
FLUID LEVEL
CHECK"
OFF vehicle 2. Torque converterAT-425, "
Locations of
Adjusting Shims, Needle
Bearings, Thrust Washers
and Snap Rings"
Symptom Condition Diagnostic ItemReference Page
EURO-OBD

AT-102
[EURO-OBD]
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Does not change from “12 ” to “11 ”
in “1” position.ON vehicle1. PNP switchAT- 11 0 , "
DTC P0705
PARK/NEUTRAL POSI-
TION (PNP) SWITCH"
2. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTRAT-122, "
DTC P0720 VEHI-
CLE SPEED SENSOR·A/T
(REVOLUTION SEN-
SOR)",AT- 1 9 9 , "DTC
VEHICLE SPEED SEN-
SOR MTR"
3. Shift solenoid valve AAT-170, "
DTC P0750
SHIFT SOLENOID VALVE
A"
4. Control valve assemblyAT-414, "
Control Valve
Assembly and Accumula-
tors"
OFF vehicle5. Low one-way clutchAT-421, "
OVERHAUL",AT-
425, "Locations of Adjust-
ing Shims, Needle Bear-
ings, Thrust Washers and
Snap Rings"
6. Brake bandAT-488, "Band Servo Pis-
ton Assembly"
7. Low & reverse brakeAT-476, "Low & Reverse
Brake"
Large shock changing from “12 ” to
“1
1 ” in “1” position.ON vehicle 1. Control valve assemblyAT-414, "
Control Valve
Assembly and Accumula-
tors"
OFF vehicle 2. Low & reverse brakeAT-476, "Low & Reverse
Brake"
Transmission overheats. ON vehicle1. Fluid levelAT- 6 3 , "
FLUID LEVEL
CHECK"
2. Engine idling rpmEC-38
[QR25 (WITH
EURO-OBD)], EC-448
[QR25 (WITHOUT EURO-
OBD)], EC-771
[QR20
(WITH EURO-OBD)], EC-
1135 [QR20 (WITHOUT
EURO-OBD)]
3. Accelerator pedal position (APP) sensorAT-180, "
DTC P1705
ACCELERATOR PEDAL
POSITION (APP) SEN-
SOR"
4. Line pressure testAT- 6 7 , "Line Pressure Test"
5. Line pressure solenoid valveAT-163, "
DTC P0745 LINE
PRESSURE SOLENOID
VA LV E"
6. Control valve assemblyAT-414, "
Control Valve
Assembly and Accumula-
tors"
Symptom Condition Diagnostic ItemReference Page
EURO-OBD

AT-104
[EURO-OBD]
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Torque converter is not locked up. ON vehicle1. Accelerator pedal position (APP) sensorAT-180, "
DTC P1705
ACCELERATOR PEDAL
POSITION (APP) SEN-
SOR"
2. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTRAT-122, "
DTC P0720 VEHI-
CLE SPEED SENSOR·A/T
(REVOLUTION SEN-
SOR)",AT- 1 9 9 , "DTC
VEHICLE SPEED SEN-
SOR MTR"
3. Engine speed signalAT-127, "DTC P0725
ENGINE SPEED SIGNAL"
4. A/T fluid temperature sensorAT-193, "
DTC BATT/FLUID
TEMP SEN (A/T FLUID
TEMP SENSOR CIRCUIT
AND TCM POWER
SOURCE)"
5. Line pressure testAT- 6 7 , "Line Pressure Test"
6. Torque converter clutch solenoid valveAT-158, "
DTC P0740
TORQUE CONVERTER
CLUTCH SOLENOID
VA LV E"
7. Control valve assemblyAT-414, "
Control Valve
Assembly and Accumula-
tors"
Torque converter is not locked up. OFF vehicle 8. Torque converterAT-425, "
Locations of
Adjusting Shims, Needle
Bearings, Thrust Washers
and Snap Rings"
Torque converter clutch piston slip.ON vehicle1. Fluid levelAT- 6 3 , "
FLUID LEVEL
CHECK"
2. Accelerator pedal position (APP) sensorAT-180, "
DTC P1705
ACCELERATOR PEDAL
POSITION (APP) SEN-
SOR"
3. Line pressure testAT- 6 7 , "Line Pressure Test"
4. Torque converter clutch solenoid valveAT-158, "
DTC P0740
TORQUE CONVERTER
CLUTCH SOLENOID
VA LV E"
5. Line pressure solenoid valveAT-163, "
DTC P0745 LINE
PRESSURE SOLENOID
VA LV E"
6. Control valve assemblyAT-414, "
Control Valve
Assembly and Accumula-
tors"
OFF vehicle 7. Torque converterAT-425, "
Locations of
Adjusting Shims, Needle
Bearings, Thrust Washers
and Snap Rings"
Symptom Condition Diagnostic ItemReference Page
EURO-OBD

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
AT-105
[EURO-OBD]
D
E
F
G
H
I
J
K
L
MA
B
AT
Lock-up point is extremely high or
low.
AT-229, "
A/T Does Not Perform
Lock-up"
ON vehicle1. Accelerator pedal position (APP) sensorAT-180, "
DTC P1705
ACCELERATOR PEDAL
POSITION (APP) SEN-
SOR"
2. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTRAT-122, "
DTC P0720 VEHI-
CLE SPEED SENSOR·A/T
(REVOLUTION SEN-
SOR)",AT-199, "DTC
VEHICLE SPEED SEN-
SOR MTR"
3. Torque converter clutch solenoid valveAT-158, "
DTC P0740
TORQUE CONVERTER
CLUTCH SOLENOID
VA LV E"
4. Control valve assemblyAT-414, "
Control Valve
Assembly and Accumula-
tors"
A/T does not shift to “D4 ” when driv-
ing with overdrive control switch
“ON”.ON vehicle1. Accelerator pedal position (APP) sensorAT-180, "
DTC P1705
ACCELERATOR PEDAL
POSITION (APP) SEN-
SOR"
2. PNP switchAT-110, "
DTC P0705
PARK/NEUTRAL POSI-
TION (PNP) SWITCH"
3. Overdrive control switchAT-241, "TCM Self-diagno-
sis Does Not Activate"
4. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTRAT-122, "
DTC P0720 VEHI-
CLE SPEED SENSOR·A/T
(REVOLUTION SEN-
SOR)",AT-199, "DTC
VEHICLE SPEED SEN-
SOR MTR"
5. Shift solenoid valve AAT-170, "
DTC P0750
SHIFT SOLENOID VALVE
A"
6. Overrun clutch solenoid valveAT-185, "
DTC P1760
OVERRUN CLUTCH
SOLENOID VALVE"
7. Control valve assemblyAT-414, "
Control Valve
Assembly and Accumula-
tors"
8. A/T fluid temperature sensorAT-193, "
DTC BATT/FLUID
TEMP SEN (A/T FLUID
TEMP SENSOR CIRCUIT
AND TCM POWER
SOURCE)"
9. Line pressure testAT-67, "Line Pressure Test"
A/T does not shift to “D4 ” when driv-
ing with overdrive control switch
“ON”.OFF vehicle10. Brake bandAT-488, "Band Servo Pis-
ton Assembly"
11. Overrun clutchAT-471, "Forward and
Overrun Clutches"
Symptom Condition Diagnostic ItemReference Page
EURO-OBD

AT-106
[EURO-OBD]
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
TCM Terminals and Reference Value
ECS004QV
PREPARATION
●Measure voltage between each terminal and terminal 25 or 48
by following “TCM INSPECTION TABLE”.
TCM HARNESS CONNECTOR TERMINAL LAYOUT
TCM INSPECTION TABLE
(Data are reference values.)
Engine is stopped at “R”, “D”, “2”
and “1” positions.ON vehicle1. Fluid levelAT- 6 3 , "
FLUID LEVEL
CHECK"
2. Torque converter clutch solenoid valveAT-158, "
DTC P0740
TORQUE CONVERTER
CLUTCH SOLENOID
VA LV E"
3. Shift solenoid valve AAT-170, "
DTC P0750
SHIFT SOLENOID VALVE
A"
4. Shift solenoid valve BAT-175, "
DTC P0755
SHIFT SOLENOID VALVE
B"
5. Control valve assemblyAT-414, "
Control Valve
Assembly and Accumula-
tors"
Symptom Condition Diagnostic ItemReference Page
EURO-OBD
SAT216J
SCIA0712E
Te r m i -
nal No.Wire color Item ConditionJudgementstan-
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

DTC P0734 A/T 4TH GEAR FUNCTION
AT-149
[EURO-OBD]
D
E
F
G
H
I
J
K
L
MA
B
AT
DTC P0734 A/T 4TH GEAR FUNCTIONPFP:31940
DescriptionECS004RM
●This malfunction will not be detected while the O/D OFF indicator lamp is indicating another self-diagnosis
malfunction.
●This malfunction is detected when the A/T does not shift into fourth gear position or line pressure is low as
instructed by the TCM. This is not caused by electrical malfunction (circuits open or shorted) but by
mechanical malfunction such as control valve sticking, improper solenoid valve operation, malfunctioning
oil pump or torque converter clutch, etc.
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Remarks: Specification data are reference values.
TCM TERMINALS AND REFERENCE VALUE
Remarks: Specification data are reference values.Gear position 1 2 3 4
Shift solenoid valve A ON (Closed) OFF (Open) OFF (Open) ON (Closed)
Shift solenoid valve B ON (Closed) ON (Closed) OFF (Open) OFF (Open)
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
11 L / WShift solenoid
valve AWhen shift solenoid valve A oper-
ates.
(When driving in “D
1 ” or “D4 ”.)Battery voltage
When shift solenoid valve A does not
operate.
(When driving in “D
2 ” or “D3 ”.)0V
12 L/YShift solenoid
valve BWhen shift solenoid valve B oper-
ates.
(When driving in “D
1 ” or “D2 ”.)Battery voltage
When shift solenoid valve B does not
operate.
(When driving in “D
3 ” or “D4 ”.)0V

AT-150
[EURO-OBD]
DTC P0734 A/T 4TH GEAR FUNCTION
ON BOARD DIAGNOSTIC LOGIC
This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by TCM as
follows:
Torque converter slip ratio = A x C/B
A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from ECM
C: Gear ratio determined as gear position which TCM supposes
If the actual gear position is much lower than the position (4th) supposed by TCM, the slip ratio will be much
less than normal. In case the ratio does not reach the specified value, TCM judges this diagnosis malfunction.
This malfunction will be caused when shift solenoid valve A is stuck open or shift solenoid valve B is stuck
closed.
*: P0734 is detected.
And also, this malfunction will be caused when line pressure is lower than normal same as line pressure sole-
noid valve stuck open.
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE
CAUTION:
●Always drive vehicle at a safe speed.
●If conducting this “DTC CONFIRMATION PROCEDURE”
again, always turn ignition switch “OFF” and wait at least 5
seconds before continuing.
●Be careful not to rev engine into the red zone on the
tachometer.
NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch “OFF” and wait at least 5 seconds before conducting the
next test.
TESTING CONDITION:
Always drive vehicle on a level road to improve the accuracy of
test.
After the repair, perform the following procedure to confirm the mal-
function is eliminated.
Gear position supposed by TCM 1 2 3 4
In case of gear position with no malfunctions 1 2 34
In case of gear position with shift solenoid valve A stuck open2233*
In case of gear position with shift solenoid valve B stuck closed 1 2 21*
Diagnostic trouble code Malfunction is detected when... Check items (Possible cause)
: A/T 4TH GR FNCTN
A/T cannot be shifted to the 4th gear posi-
tion even if electrical circuit is good.
●Shift solenoid valve A
●Shift solenoid valve B
●Line pressure solenoid valve
●Each clutch
●Hydraulic control circuit : P0734
SAT014K
SAT971J

DTC P0734 A/T 4TH GEAR FUNCTION
AT-153
[EURO-OBD]
D
E
F
G
H
I
J
K
L
MA
B
AT
Diagnostic ProcedureECS004RO
1.CHECK SHIFT UP (D3 TO D4 )
During “Cruise test — Part 1” (AT- 7 8 , "
Cruise Test — Part 1" ), does
A/T shift from D
3 to D4 at the specified speed?
Ye s o r N o
Ye s > > G O T O 9 .
No >> GO TO 2.
2.CHECK LINE PRESSURE
Perform line pressure test.
Refer to AT-67, "
Line Pressure Test" .
OK or NG
OK >> GO TO 3.
NG >> GO TO 6.
3.CHECK SOLENOID VALVES
1. Remove control valve assembly.
Refer to AT-414, "
REMOVAL" .
2. Refer to AT-156, "
Component Inspection" .
OK or NG
OK >> GO TO 4.
NG >> Replace solenoid valve assembly.
SAT988H
SCIA0759E