NISSAN X-TRAIL 2003 Service Repair Manual

TROUBLE DIAGNOSIS — INTRODUCTION
AT-255
[EXC.F/EURO-OBD]
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Work FlowECS004TG
HOW TO PERFORM TROUBLE DIAGNOSES FOR QUICK AND ACCURATE REPAIR
A good understanding of the malfunction conditions can make troubleshooting faster and more accurate. In
general, each customer feels differently about a problem. It is important to fully understand the symptoms or
conditions for a customer complaint.
Make good use of the two sheets provided, “INFORMATION FROM CUSTOMER” (AT- 2 5 2
) and “DIAGNOS-
TIC WORKSHEET” (AT- 2 5 3
), to perform the best troubleshooting possible.
WORK FLOW CHART
*1AT-252*2AT- 2 5 3*3AT- 1 0
*4AT-256*5AT- 2 5 7*6AT-260
*7AT-262*8AT- 2 4 6*9AT-242
*10AT-242*11AT- 3 3 2*12AT-329
*13AT-291*14AT- 3 2 2:15AT-277
*16AT-245*17AT- 2 5 0*18AT-332
*19AT-329
SAT097KC

AT-256
[EXC.F/EURO-OBD]
TROUBLE DIAGNOSIS — BASIC INSPECTION

TROUBLE DIAGNOSIS — BASIC INSPECTIONPFP:00000
A/T Fluid CheckECS004VR
FLUID LEAKAGE CHECK
1. Clean area suspected of leaking. — for example, mating surface
of converter housing and transmission case.
2. Start engine, apply foot brake, place selector lever in D position
and wait a few minutes.
3. Stop engine.
4. Check for fresh leakage.
FLUID CONDITION CHECK
FLUID LEVEL CHECK
Refer to AT- 1 6 , "Checking A/T Fluid" .
SAT767B
SAT288G
Fluid color Suspected problem
Dark or black with burned odor Wear of frictional material
Milky pink Water contamination — Road water
entering through filler tube or breather
Varnished fluid, light to dark brown and
tackyOxidation — Over or under filling, —
Overheating
SAT638A

TROUBLE DIAGNOSIS — BASIC INSPECTION
AT-257
[EXC.F/EURO-OBD]
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Stall TestECS004VS
STALL TEST PROCEDURE
1. Check A/T fluid and engine oil levels. If necessary, add.
2. Drive vehicle for approx. 10 minutes or until fluid and oil reach
operating temperature. Refer to AT- 1 7 , "
Changing A/T Fluid" .
3. Set parking brake and block wheels.
4. Install a tachometer where it can be seen by driver during test.

It is good practice to mark the point of specified engine
rpm on indicator.
5. Start engine, apply foot brake, and place selector lever in D
position.
6. Accelerate to wide open throttle gradually while applying foot
brake.
7. Quickly note the engine stall revolution and immediately release
throttle.

During test, never hold throttle wide open for more than 5
seconds.
8. Move selector lever to N position.
9. Cool off ATF.

Run engine at idle for at least one minute.
10. Repeat steps 5 through 9 with selector lever in 2, 1 and R posi-
tions.
SAT647B
SAT513G
Stall revolution:
QR20DE: 2,450 - 2,950 rpm
QR25DE: 2,300 - 2,750 rpm
SAT514G
SAT771B

AT-258
[EXC.F/EURO-OBD]
TROUBLE DIAGNOSIS — BASIC INSPECTION

JUDGEMENT OF STALL TEST
The test result and possible damaged components relating to each result are shown in the illustrations on next
page.
In order to pinpoint the possible damaged components, follow the WORK FLOW shown in AT- 2 5 5 , "
Work
Flow" (EXCEPT FOR EURO-OBD).
NOTE:
Stall revolution is too high in D, 2 or 1 position:

Slippage occurs in 1st gear but not in 2nd and 3rd gears...... Low one-way clutch slippage

Slippage occurs in the following gears:
1st through 3rd gears in D position and engine brake functions with overdrive control switch set to OFF.
1st and 2nd gears in 2 position and engine brake functions with accelerator pedal released (fully closed
throttle)...... Forward clutch or forward one-way clutch slippage
Stall revolution is too high in R position:

Engine brake does not function in 1 position...... Low & reverse brake slippage

Engine brake functions in 1 position...... Reverse clutch slippage
Stall revolution within specifications:

Vehicle does not achieve speed of more than 80 km/h (50 MPH)...... One-way clutch seizure in torque
converter housing
CAUTION:
Be careful since automatic fluid temperature increases abnormally.

Slippage occurs in 3rd and 4th gears in D position...... High clutch slippage

Slippage occurs in 2nd and 4th gear in D position...... Brake band slippage

Engine brake does not function in 2nd and 3rd gears in D position, 2nd gear in 2 position, and 1st gear in
1 position with overdrive control switch set to OFF...... Overrun clutch slippage
Stall revolution less than specifications:

Poor acceleration during starts...... One-way clutch slippage in torque converter

TROUBLE DIAGNOSIS — BASIC INSPECTION
AT-259
[EXC.F/EURO-OBD]
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SCIA0707E

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

AT-262
[EXC.F/EURO-OBD]
TROUBLE DIAGNOSIS — BASIC INSPECTION

Road TestECS004VU
DESCRIPTION

The purpose of the test is to determine overall performance of A/
T and analyze causes of problems.

The road test consists of the following three parts:
1. Check before engine is started
2. Check at idle
3. Cruise test

Before road test, familiarize yourself with all test procedures and
items to check.

Conduct tests on all items until specified symptom is found.
Troubleshoot items which check out No Good after road test.
Refer to the following items.
SAT786A
ON BOARD DIAGNOSTIC SYS-
TEM DESCRIPTIONTROUBLE DIAGNOSES FOR
SYMPTOMS
Except for
Euro-OBD AT- 2 4 2
to AT-246AT-291 to AT- 3 2 4SAT496G

TROUBLE DIAGNOSIS — BASIC INSPECTION
AT-263
[EXC.F/EURO-OBD]
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1. CHECK BEFORE ENGINE IS STARTED
1. CHECK O/D OFF INDICATOR LAMP
1. Park vehicle on flat surface.
2. Move selector lever to P position.
3. Turn ignition switch to OFF position.
4. Wait 5 seconds.
5. Set overdrive control switch to ON position.
6. Turn ignition switch to ON. (Do not start engine.)
Does O/D OFF indicator lamp come on for about 2 seconds?
YES >> 1. Turn ignition switch to OFF position.
2. Perform self-diagnosis and note NG items.
Refer to AT- 2 4 6 , "
SELF-DIAGNOSTIC PROCEDURE
(WITHOUT CONSULT-II)" .
3. GO TO “2. CHECK AT IDLE”, AT- 2 6 4
.
NO >> Stop road test. GO TO “O/D OFF indicator Lamp Does
Not Come On”. AT- 2 9 1
.
SAT774B
SCIA5468E

AT-264
[EXC.F/EURO-OBD]
TROUBLE DIAGNOSIS — BASIC INSPECTION

2. CHECK AT IDLE
1. CHECK ENGINE START
1. Park vehicle on flat surface.
2. Move selector lever to P or N position.
3. Turn ignition switch to OFF position.
4. Turn ignition switch to START position.
Is engine started?
YES >> GO TO 2.
NO >>

Stop Road Test. Mark the box on the DIAGNOSTIC
WORKSHEET. Refer to AT- 2 5 2 , "
DIAGNOSTIC
WORKSHEET" .

GO TO AT- 2 9 3 , "Engine Cannot Be Started In “P” and
“N” Position" .
2. CHECK ENGINE START
1. Turn ignition switch to ON position. (Do not start engine.)
2. Move selector lever to D, 1, 2 or R position.
3. Turn ignition switch to START.
Is engine started?
YES >>
Stop Road Test. Mark the box on the DIAGNOSTIC
WORKSHEET. Refer to AT- 2 5 2 , "
DIAGNOSTIC
WORKSHEET" .

GO TO AT- 2 9 3 , "Engine Cannot Be Started In “P” and
“N” Position" .

Continue Road Test. Refer to AT- 2 6 2 , "Road Test" .
NO >> GO TO 3.
3. CHECK VEHICLE MOVE
1. Move selector lever to P position.
2. Turn ignition switch to OFF position.
3. Release parking brake.
4. Push vehicle forward or backward.
Does vehicle move when it is pushed forward or backward?
YES >>
Mark the box on the DIAGNOSTIC WORKSHEET.
Refer to AT- 2 5 2 , "
DIAGNOSTIC WORKSHEET" .

GO TO AT- 2 9 4 , "In “P” Position, Vehicle Moves For-
ward Or Backward When Pushed" .

Continue Road Test.
NO >> GO TO 4.
SAT769B
SAT770B
SAT768B
SAT796A