2005 NISSAN X-TRAIL oil pressure

AT-140
[EURO-OBD]
DTC P0734 A/T 4TH GEAR FUNCTION

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.
On Board Diagnosis LogicECS00CU1
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.
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%
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 open 2 2 33*
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

AT-154
[EURO-OBD]
DTC P0745 LINE PRESSURE SOLENOID VALVE

DTC P0745 LINE PRESSURE SOLENOID VALVEPFP:31940
DescriptionECS004RU
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 pres-
sure 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”.
On Board Diagnosis LogicECS00CU7
Possible CauseECS00CU8
Check the following items.

Harness or connector
(The solenoid circuit is open shorted.)

Line pressure solenoid valve
DTC Confirmation ProcedureECS00CU9
NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch OFF and
wait at least 5 seconds before conducting the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1. Turn ignition switch ON and select “DATA MONITOR” mode for
“A/T” with CONSULT-II.
SCIA0735E
Monitor item Condition Specification
Line pressure solenoid valve dutySmall throttle opening
(Low line pressure)
↓
Large throttle opening
(High line pressure)Approximately 0%
↓
Approximately 95%
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.

Harness or connectors
(The solenoid circuit is open or shorted.)

Line pressure solenoid valve
: P0745
SAT014K

TROUBLE DIAGNOSES FOR SYMPTOMS
AT-209
[EURO-OBD]
D
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Large Shock. “N” → “R” PositionECS004SY
SYMPTOM:
There is large shock when changing from “N” to “R” position.
1. CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Refer to AT- 4 5 , "
SELF-DIAGNOSTIC PROCEDURE (WITH CONSULT-II)" or AT- 5 2 ,
"Diagnostic Procedure Without CONSULT-II" .
Do the self-diagnosis results indicate A/T fluid temperature sensor, line pressure solenoid valve, accelerator
pedal position (APP) sensor circuit?
YES >>
Check damaged circuit. Refer to the following items.
–AT- 1 5 4 , "DTC P0745 LINE PRESSURE SOLENOID VALVE"
–AT- 1 7 3 , "DTC P1705 ACCELERATOR PEDAL POSITION (APP) SENSOR"
– AT- 1 8 4 , "DTC BATT/FLUID TEMP SEN (A/T FLUID TEMP SENSOR CIRCUIT AND TCM
POWER SOURCE)"
NO >> GO TO 2
2. CHECK LINE PRESSURE
Check line pressure at idle with selector lever in D position. Refer to
AT- 6 8 , "
Line Pressure Test" .
OK or NG
OK >> GO TO 3.
NG >> 1. Remove control valve assembly. Refer to AT- 4 0 4 ,
"Control Valve Assembly and Accumulators" .
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
–Oil pump assembly. Refer to AT- 4 4 3 , "Oil Pump" .
3. CHECK SYMPTOM
Check again. Refer to AT- 7 2 , "
2. CHECK AT IDLE" .
OK or NG
OK >>INSPECTION END
NG >> 1. Perform TCM input/output signal inspection. Refer to AT- 9 4 , "
TCM Terminals and Reference
Va l u e" .
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
SAT494G

AT-210
[EURO-OBD]
TROUBLE DIAGNOSES FOR SYMPTOMS

Vehicle Does Not Creep Backward In “R” PositionECS004SZ
SYMPTOM:
Vehicle does not creep backward when selecting “R” position.
1. CHECK A/T FLUID LEVEL
Check A/T fluid level. Refer to AT- 1 6 , "
Checking A/T Fluid" .
OK or NG
OK >> GO TO 2.
NG >> Refill ATF.
2. CHECK LINE PRESSURE
Check line pressure at idle with selector lever in R position. Refer to
AT- 6 8 , "
Line Pressure Test" .
OK or NG
OK >> GO TO 3.
NG >> 1. Remove control valve assembly. Refer to AT- 4 0 4 ,
"Control Valve Assembly and Accumulators" .
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
3. Disassemble A/T. Refer to AT- 4 2 4 , "
Disassembly" .
4. Check the following item:
–Oil pump assembly. Refer to AT- 4 4 3 , "Oil Pump" .
3. CHECK STALL TEST
Check stall revolution with selector lever in 1 and R positions.
Refer to AT- 6 5 , "
Stal l Tes t" .
OK or NG
OK >> GO TO 4.
OK in “1” position, NG in R position>>1.Disassemble A/T. Refer to
AT- 4 2 4 , "
Disassembly" .
2. Check the following items:
–Reverse clutch assembly. Refer to AT- 4 6 4 , "Reverse
Clutch" .
–Low & reverse brake assembly. Refer to AT- 4 8 3 , "Low
& Reverse Brake" .
NG in both “1” and “R” positions>>GO TO 6.
SAT638A
SAT494G
SAT493G

AT-212
[EURO-OBD]
TROUBLE DIAGNOSES FOR SYMPTOMS

Vehicle Does Not Creep Forward In “D”, “2” Or “1” PositionECS004T0
SYMPTOM:
Vehicle does not creep forward when selecting “D”, “2” or “1” position.
1. CHECK A/T FLUID LEVEL
Check A/T fluid level. Refer to AT- 1 6 , "
Checking A/T Fluid" .
OK or NG
OK >> GO TO 2.
NG >> Refill ATF.
2. CHECK LINE PRESSURE
Check line pressure at idle with selector lever in D position. Refer to
AT- 6 8 , "
Line Pressure Test" .
OK or NG
OK >> GO TO 3.
NG >> 1. Remove control valve assembly. Refer to AT- 4 0 4 ,
"Control Valve Assembly and Accumulators" .
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
3. Disassemble A/T. Refer to AT- 4 2 4 , "
Disassembly" .
4. Check the following item:
–Oil pump assembly. Refer to AT- 4 4 3 , "Oil Pump" .
3. CHECK STALL TEST
Check stall revolution with selector lever in D position. Refer to AT-
65, "Stal l Te st" .
OK or NG
OK >> GO TO 4.
NG >> GO TO 6.
SAT638A
SAT494G
SAT493G

AT-260
[EXC.F/EURO-OBD]
TROUBLE DIAGNOSIS — BASIC INSPECTION

Line Pressure TestECS004VT
LINE PRESSURE TEST PORTS
Location of line pressure test ports are shown in the illustration.

Always replace pressure plugs as they are self-sealing
bolts.
LINE PRESSURE TEST PROCEDURE
1. Check A/T fluid and engine oil levels. If necessary, add fluid or
oil.
2. Drive vehicle for approx. 10 minutes or until engine oil and ATF
reach operating temperature. Refer to AT- 1 7 , "
Changing A/T
Fluid" .
3. Install pressure gauge to corresponding line pressure port.
4. Set parking brake and block wheels.

Continue to depress brake pedal fully while line pressure
test is being performed at stall speed.
SCIA0709E
SAT647B
UAT008
SAT513G

TROUBLE DIAGNOSIS — BASIC INSPECTION
AT-261
[EXC.F/EURO-OBD]
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5. Start engine and measure line pressure at idle and stall speed.

When measuring line pressure at stall speed, follow the
stall test procedure.
LINE PRESSURE
JUDGEMENT OF LINE PRESSURE TEST
SAT493G
Check lock-up hold.Line pressure kPa (bar, kg/cm2 , psi)
“D”, “2” and “1” positions “R” position
Idle 500 (5.00, 5.1, 73) 778 (7.78, 7.9, 113)
Stall 1,233 (12.33, 12.6, 179) 1,918 (19.18, 19.6, 278)
Judgement Suspected parts
At idleLine pressure is low in all positions.

Oil pump wear

Control piston damage

Pressure regulator valve or plug sticking

Spring for pressure regulator valve damaged

Fluid pressure leakage between oil strainer and pressure regulator valve

Clogged strainer
Line pressure is low in particular posi-
tion.

Fluid pressure leakage between manual valve and particular clutch

For 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 AT- 2 3
.
Line pressure is high.

Maladjustment of throttle position sensor

A/T fluid temperature sensor damaged

Line pressure solenoid valve sticking

Short circuit of line pressure solenoid valve circuit

Pressure modifier valve sticking

Pressure regulator valve or plug sticking

Open in dropping resistor circuit
At stall
speedLine pressure is low.

Maladjustment of throttle position sensor

Line pressure solenoid valve sticking

Short circuit of line pressure solenoid valve circuit

Pressure regulator valve or plug sticking

Pressure modifier valve sticking

Pilot valve sticking

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
AT-277
[EXC.F/EURO-OBD]
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TROUBLE DIAGNOSIS — GENERAL DESCRIPTIONPFP:00000
Symptom ChartECS004VV
Numbers are arranged in order of inspection.
Perform inspections starting with number one and work up.
Symptom Condition Diagnostic Item Reference Page
Engine cannot start in “P” and “N”
positions.
AT- 2 9 3
ON vehicle1. Ignition switch and starterPG-2
,
SC-23

2. Control cable adjustmentAT- 4 0 9
3. PNP switchAT- 3 2 4
Engine starts in position other than
“N” and “P” positions.
AT- 2 9 3
ON vehicle1. Control cable adjustmentAT- 4 0 92. PNP switchAT- 3 2 4
Transaxle noise in “P” and “N” posi-
tions.ON vehicle1. Fluid levelAT- 2 5 6
2. Line pressure testAT- 2 6 0
3. Accelerator pedal position (APP) sensorAT- 3 4 5
4. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTRAT- 3 3 2,
AT- 3 3 9
OFF vehicle5. Oil pumpAT- 4 4 36. Torque converterAT- 4 2 3
Vehicle moves when changing into “P”
position, or parking gear does not dis-
engage when shifted out of “P” posi-
tion.
AT- 2 9 4ON vehicle 1. Control cable adjustmentAT- 4 0 9
OFF vehicle 2. Parking componentsAT- 4 1 6,
AT- 4 4 0
Vehicle runs in “N” position.
AT- 2 9 5
ON vehicle 1. Control cable adjustmentAT- 4 0 9
OFF vehicle2. Forward clutchAT- 4 7 53. Reverse clutchAT- 4 6 4
4. Overrun clutchAT- 4 7 5
Vehicle will not run in “R” position (but
runs in “D”, “2” and “1” positions).
Clutch slips.
Very poor acceleration.
AT- 2 9 7
ON vehicle1. Control cable adjustmentAT- 4 0 9
2. Stall testAT- 2 5 7
3. Line pressure testAT- 2 6 0
4. Line pressure solenoid valveAT- 3 8 7
5. Control valve assemblyAT- 4 0 4
Vehicle will not run in “R” position (but
runs in “D”, “2” and “1” positions).
Clutch slips.
Very poor acceleration.
AT- 2 9 7
OFF vehicle6. Reverse clutchAT- 4 6 4
7. High clutchAT- 4 6 9
8. Forward clutchAT- 4 7 5
9. Overrun clutchAT- 4 7 5
10. Low & reverse brakeAT- 4 8 3
Vehicle braked when shifting into “R”
position.ON vehicle1. Fluid levelAT- 2 5 6
2. Line pressure testAT- 2 6 0
3. Line pressure solenoid valveAT- 3 8 7
4. Control valve assemblyAT- 4 0 4
OFF vehicle5. High clutchAT- 4 6 96. Brake bandAT- 4 9 7
7. Forward clutchAT- 4 7 5
8. Overrun clutchAT- 4 7 5