brake INFINITI QX4 2001 Factory Owner's Manual

SAT493G
5. Start engine and measure line pressure at idle and stall speed.
IWhen measuring line pressure at stall speed, follow the
stall test procedure.
Line pressure:
Refer to SDS, AT-356.
JUDGEMENT OF LINE PRESSURE TESTNBAT0023S02
Judgement Suspected parts
At idleLine pressure is low in all posi-
tions.IOil pump wear
IControl piston damage
IPressure regulator valve or plug sticking
ISpring for pressure regulator valve damaged
IFluid pressure leakage between oil strainer and pressure regulator valve
IClogged strainer
Line pressure is low in particu-
lar position.IFluid pressure leakage between manual valve and particular clutch
IFor example, line pressure is:
Ð Low in ªRº and ª1º positions, but
Ð Normal in ªDº and ª2º positions.
Then, fluid leakage exists at or around low and reverse brake circuit.
Refer to ªCLUTCH AND BAND CHARTº, AT-17.
Line pressure is high.IMal-adjustment of throttle position sensor
IFluid temperature sensor damaged
ILine pressure solenoid valve sticking
IShort circuit of line pressure solenoid valve circuit
IPressure modifier valve sticking
IPressure regulator valve or plug sticking
IOpen in dropping resistor circuit
At stall speedLine pressure is low.IMal-adjustment of throttle position sensor
ILine pressure solenoid valve sticking
IShort circuit of line pressure solenoid valve circuit
IPressure regulator valve or plug sticking
IPressure modifier valve sticking
IPilot valve sticking
SAT786A
Road TestNBAT0024DESCRIPTIONNBAT0024S01IThe purpose of the test is to determine overall performance of
A/T and analyze causes of problems.
IThe road test consists of the following three parts:
1. Check before engine is started
2. Check at idle
3. Cruise test
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TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Line Pressure Test (Cont'd)
AT-63

2. CHECK AT IDLE=NBAT0024S03
1 CHECK ENGINE START
1. Park vehicle on flat surface.
2. Turn ignition switch to ªOFFº position.
3. Move selector lever to ªPº or ªNº position.
4. Turn ignition switch to start position.
5. Is engine started?
YesorNo
Ye s©GO TO 2.
No©Go to ª2. Engine Cannot Be Started In ªPº and ªNº Positionº, AT-221.
2 CHECK ENGINE START
1. Turn ignition switch to ªOFFº position.
2. Move selector lever to ªDº, ª1º, ª2º or ªRº position.
3. Turn ignition switch to start position.
4. Is engine started?
YesorNo
Ye s©Go to ª2. Engine Cannot Be Started In ªPº and ªNº Positionº, AT-221.
No©GO TO 3.
3 CHECK VEHICLE MOVE
1. Turn ignition switch to ªOFFº position.
2. Move selector lever to ªPº position.
3. Release parking brake.
4. Push vehicle forward or backward.
5. Does vehicle move when it is pushed forward or backward?
SAT796A
YesorNo
Ye s©Go to ª3. In ªPº Position, Vehicle Moves Forward Or Backward When Pushedº, AT-222.
No©GO TO 4.
4 CHECK VEHICLE MOVE
1. Apply parking brake.
2. Move selector lever to ªNº position.
3. Turn ignition switch to ªSTARTº position and start engine.
4. Release parking brake.
5. Does vehicle move forward or backward?
YesorNo
Ye s©Go to ª4. In ªNº Position, Vehicle Movesº, AT-223.
No©GO TO 5.
TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
AT-66

5 CHECK SHIFT SHOCK
1. Apply foot brake.
2. Move selector lever to ªRº position.
3. Is there large shock when changing from ªNº to ªRº position?
SAT082J
YesorNo
Ye s©Go to ª5. Large Shock. ªNº,ªRº Positionº, AT-225.
No©GO TO 6.
6 CHECK VEHICLE MOVE
1. Release foot brake for several seconds.
2. Does vehicle creep backward when foot brake is released?
YesorNo
Ye s©GO TO 7.
No©Go to ª6. Vehicle Does Not Creep Backward In ªRº Positionº, AT-227.
7 CHECK VEHICLE MOVE
1. Move selector lever to ªDº, ª2º and ª1º position and check if vehicle creeps forward.
2. Does vehicle creep forward in all three positions?
YesorNo
Ye s©Go to ª3. Cruise testº, AT-67.
No©Go to ª7. Vehicle Does Not Creep Forward In ªDº, ª2º Or ª1º Positionº, AT-230.
SAT601J
3. CRUISE TESTNBAT0024S04ICheck all items listed in Parts 1 through 3.
With CONSULT-IINBAT0024S0401IUsing CONSULT-II, conduct a cruise test and record the result.
IPrint the result and ensure that shifts and lock-ups take place
as per ªShift Scheduleº.
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TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
AT-67

7 CHECK LOCK-UP OFF (D4L/U TO D4)
1. Release accelerator pedal.
2. Is lock-up released when accelerator pedal is released?
SAT958I
YesorNo
Ye s©GO TO 8.
No©Go to ª14. Lock-up Is Not Releasedº, AT-249.
8 CHECK SHIFT DOWN (D4TO D3)
1. Decelerate vehicle by applying foot brake lightly.
2. Does engine speed return to idle smoothly when A/T is shifted from D
4to D3?
Read gear position and engine speed.
SAT959I
YesorNo
Ye s©1. Stop vehicle.
2. Go to ªCruise test Ð Part 2º, AT-75.
No©Go to ª15. Engine Speed Does Not Return To Idle (Light Braking D
4,D3)º, AT-250.
TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
AT-74

3 CHECK SHIFT UP (D2TO D3)
Does A/T shift from D2to D3at the specified speed?
Read gear position, throttle position and vehicle speed.
Specified speed when shifting from D
2to D3:
Refer to Shift schedule, AT-356.
SAT960I
YesorNo
Ye s©GO TO 4.
No©Go to ª10. A/T Does Not Shift: D
2,D3º, AT-239.
4 CHECK SHIFT UP (D3TO D4) AND ENGINE BRAKE
Release accelerator pedal after shifting from D2to D3.
Does A/T shift from D
3to D4and does vehicle decelerate by engine brake?
Read gear position, throttle position and vehicle speed.
SAT405H
YesorNo
Ye s©1. Stop vehicle.
2. Go to ªCruise test Ð Part 3º, AT-77.
No©Go to ª11. A/T Does Not Shift: D
3,D4º, AT-242.
TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
AT-76

3 CHECK ENGINE BRAKE
Does vehicle decelerate by engine brake?
SAT999IA
YesorNo
Ye s©GO TO 4.
No©Go to ª15. Engine Speed Does Not Return To Idle (Light Braking D
4,D3)º, AT-250.
4 CHECK SHIFT DOWN (D3TO D2)
1. Move selector lever from ªDº to ª2º position while driving in D3(O/D OFF).
2. Does A/T shift from D
3(O/D OFF) to 22?
Read gear position.
SAT791GB
YesorNo
Ye s©GO TO 5.
No©Go to ª18. A/T Does Not Shift: D
3,D2, When Selector Lever ªDº,ª2º Positionº,
AT-254.
TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
AT-78

5 CHECK ENGINE BRAKE
Does vehicle decelerate by engine brake?
SAT791GB
YesorNo
Ye s©GO TO 6.
No©Go to ª15. Engine Speed Does Not Return To Idle (Light Braking D
4,D3)º, AT-250.
6 CHECK SHIFT DOWN (22TO 11)
1. Move selector lever from ª2º to ª1º position while driving in 22.
2. Does A/T shift from 2
2to 11position?
SAT778B
YesorNo
Ye s©GO TO 7.
No©Go to ª19. A/T Does Not Shift: 2
2,11, When Selector lever ª2º,ª1º Positionº, AT-255.
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TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
AT-79

7 CHECK ENGINE BRAKE
Does vehicle decelerate by engine brake?
SAT778B
YesorNo
Ye s©1. Stop vehicle.
2. Perform self-diagnosis. Refer to TCM SELF-DIAGNOSTIC PROCEDURE (No Tools),
AT-46.
No©Go to ª20. Vehicle Does Not Decelerate By Engine Brakeº, AT-256.
TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
AT-80

Items Symptom Condition Diagnostic Item Reference Page
Shift ShockToo sharp a
shock in change
from D
1to D2.ON vehicle1. Throttle position sensor (Adjustment) EC-174
2. Line pressure test AT-62
3. Accumulator servo release AT-273
4. Control valve assembly AT-273
5. A/T fluid temperature sensor AT-105
OFF vehicle 6. Brake band AT-333
Too sharp a
shock in change
from D
2to D3.ON vehicle1. Throttle position sensor (Adjustment) EC-174
2. Line pressure test AT-62
3. Control valve assembly AT-273
OFF vehicle4. High clutch AT-317
5. Brake band AT-333
Too sharp a
shock in change
from D
3to D4.ON vehicle1. Throttle position sensor (Adjustment) EC-174
2. Line pressure test AT-62
3. Control valve assembly AT-273
OFF vehicle4. Brake band AT-333
5. Overrun clutch AT-320
Gear change
shock felt during
deceleration by
releasing accel-
erator pedal.ON vehicle1. Throttle position sensor (Adjustment) EC-174
2. Line pressure test AT-62
3. Overrun clutch solenoid valve AT-185
4. Control valve assembly AT-273
Large shock
changing from 1
2to 11in 1 position.ON vehicle 1. Control valve assembly AT-273
ON vehicle 2. Low & reverse brake AT-324
Improper Shift
TimingToo high a gear
change point from
D
1to D2, from D2to D3, from D3to
D
4.
AT-236, 239, 242ON vehicle1. Throttle position sensor (Adjustment) EC-174
2. Vehicle speed sensor´A/T (Revolution
sensor) and vehicle speed sensor´MTRAT- 111 , 1 9 7
3. Shift solenoid valve A AT-168
4. Shift solenoid valve B AT-172
Gear change
directly from D
1to
D
3occurs.ON vehicle1. Fluid level AT-59
2. Accumulator servo release AT-273
OFF vehicle 3. Brake band AT-333
Too high a
change point from
D
4to D3, from D3to D2, from D2to
D
1.ON vehicle1. Throttle position sensor (Adjustment) EC-174
2. Vehicle speed sensor´A/T (Revolution
sensor) and vehicle speed sensor´MTRAT- 111 , 1 9 7
Kickdown does
not operate when
depressing pedal
in D
4within kick-
down vehicle
speed.ON vehicle1. Throttle position sensor (Adjustment) EC-174
2. Vehicle speed sensor´A/T (Revolution
sensor) and vehicle speed sensor´MTRAT- 111 , 1 9 7
3. Shift solenoid valve A AT-168
4. Shift solenoid valve B AT-172
TROUBLE DIAGNOSIS Ð GENERAL DESCRIPTION
Symptom Chart (Cont'd)
AT-82

Items Symptom Condition Diagnostic Item Reference Page
Improper Shift
TimingKickdown oper-
ates or engine
overruns when
depressing pedal
in D
4beyond kick-
down vehicle
speed limit.ON vehicle1. Vehicle speed sensor´A/T (Revolution
sensor) and vehicle speed sensor´MTRAT- 111 , 1 9 7
2. Throttle position sensor (Adjustment) EC-174
3. Shift solenoid valve A AT-168
4. Shift solenoid valve B AT-172
Gear change from
2
2to 23in 2 posi-
tion.ON vehicle1. Park/neutral position (PNP) switch
adjustmentAT-276
Gear change from
1
1to 12in 1 posi-
tion.ON vehicle1. Park/neutral position (PNP) switch
adjustmentAT-276
2. Manual control linkage adjustment AT-276
No Down ShiftFailure to change
gear from D
4to
D
3.ON vehicle1. Fluid level AT-59
2. Throttle position sensor (Adjustment) EC-174
3. Overrun clutch solenoid valve AT-185
4. Shift solenoid valve A AT-168
5. Line pressure solenoid valve AT-162
6. Control valve assembly AT-273
OFF vehicle7. Low & reverse brake AT-324
8. Overrun clutch AT-320
Failure to change
gear from D
3to
D
2or from D4to
D
2.ON vehicle1. Fluid level AT-59
2. Throttle position sensor (Adjustment) EC-174
3. Shift solenoid valve A AT-168
4. Shift solenoid valve B AT-172
5. Control valve assembly AT-273
OFF vehicle6. High clutch AT-317
7. Brake band AT-333
Failure to change
gear from D
2to
D
1or from D3to
D
1.ON vehicle1. Fluid level AT-59
2. Throttle position sensor (Adjustment) EC-174
3. Shift solenoid valve A AT-168
4. Shift solenoid valve B AT-172
5. Control valve assembly AT-273
OFF vehicle6. Low one-way clutch AT-328
7. High clutch AT-317
8. Brake band AT-333
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TROUBLE DIAGNOSIS Ð GENERAL DESCRIPTION
Symptom Chart (Cont'd)
AT-83