Page 2097 of 4179
TROUBLE DIAGNOSIS — INTRODUCTION
AT-61
[EURO-OBD]
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Work FlowECS004QP
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- 5 8 , "
Information from
Customer" ) and “DIAGNOSTIC WORKSHEET” (AT- 5 9 , "Diagnostic Worksheet" ), to perform the best trouble-
shooting possible.
Page 2098 of 4179
AT-62
[EURO-OBD]
TROUBLE DIAGNOSIS — INTRODUCTION
WORK FLOW CHART
SAT183K
*1:AT- 5 8*2:AT- 5 9*3:AT- 1 0
*4:AT- 6 4*5:AT- 6 5 and AT- 6 8*6:AT- 7 0
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TROUBLE DIAGNOSIS — INTRODUCTION
AT-63
[EURO-OBD]
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*7:AT- 4 4*8:AT- 4 0*9:AT- 5 2
*10:AT-100*11:AT- 1 9 2 and AT- 1 9 8 to AT- 2 0 0*12:AT- 2 0 4
*13:AT-235*14:AT- 8 5*15:AT- 4 2
*16:AT-100*17:AT- 1 9 2 and AT- 1 9 8 to AT- 2 0 0*18:EC-52
Page 2100 of 4179
AT-64
[EURO-OBD]
TROUBLE DIAGNOSIS — BASIC INSPECTION
TROUBLE DIAGNOSIS — BASIC INSPECTIONPFP:00000
A/T Fluid CheckECS004QQ
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
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TROUBLE DIAGNOSIS — BASIC INSPECTION
AT-65
[EURO-OBD]
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Stall TestECS004QR
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 6 , "
Checking 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.
SAT647B
SAT513G
SAT775B
Stall revolution:
QR20DE: 2,450 - 2,950 rpm
QR25DE: 2,300 - 2,750 rpm
SAT514G
Page 2102 of 4179
![NISSAN X-TRAIL 2003 Service Repair Manual AT-66
[EURO-OBD]
TROUBLE DIAGNOSIS — BASIC INSPECTION
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 NISSAN X-TRAIL 2003 Service Repair Manual AT-66
[EURO-OBD]
TROUBLE DIAGNOSIS — BASIC INSPECTION
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](/manual-img/5/57404/w960_57404-2101.png)
AT-66
[EURO-OBD]
TROUBLE DIAGNOSIS — BASIC INSPECTION
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.
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- 6 1 , "
Work Flow"
(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
SAT771B
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TROUBLE DIAGNOSIS — BASIC INSPECTION
AT-67
[EURO-OBD]
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SCIA0707E
Page 2104 of 4179
AT-68
[EURO-OBD]
TROUBLE DIAGNOSIS — BASIC INSPECTION
Line Pressure TestECS004QS
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 6 , "
Checking 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