IDX INFINITI QX4 2001 Factory Owner's Guide

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TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Stall Test (Cont'd)
AT-61

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
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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 O/D OFF INDICATOR LAMP
Does O/D OFF indicator lamp flicker for about 8 seconds?
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YesorNo
Ye s©Perform self-diagnosis. Refer to TCM SELF-DIAGNOSIS PROCEDURE (No Tools),
AT-46.
No©GO TO 3.
3 CHECK NG ITEM
1. Turn ignition switch to ªOFFº position.
2. Perform self-diagnosis and note NG items.
Refer to TCM SELF-DIAGNOSIS PROCEDURE (No Tools), AT-46.
©Go to ª2. Check at idleº, AT-66.
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TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
AT-65

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?
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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.
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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)
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9. Touch ªSETTINGº to set recording condition (ªAUTO TRIGº or
ªMANU TRIGº) and touch ªBACKº.
10. Touch ªStartº.
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11. When performing cruise test, touch ªRECORDº.
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12. After finishing cruise test part 1, touch ªSTOPº.
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13. Touch ªSTOREº and touch ªBACKº.
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TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
AT-69

Cruise Test Ð Part 1=NBAT0024S0404
1 CHECK STARTING GEAR (D1) POSITION
1. Drive vehicle for approx. 10 minutes to warm engine oil and ATF up to operating temperature.
ATF operating temperature:
50 - 80ÉC (122 - 176ÉF)
2. Park vehicle on flat surface.
3. Set overdrive control switch to ªONº position.
4. Move selector lever to ªPº position.
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5. Start engine.
6. Move selector lever to ªDº position.
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7. Accelerate vehicle by constantly depressing accelerator pedal halfway.
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8. Does vehicle start from D1?
Read gear position.
YesorNo
Ye s©GO TO 2.
No©Go to ª8. Vehicle Cannot Be Started From D
1º, AT-233.
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TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
AT-71

4 CHECK SHIFT UP (D3TO D4)
Does A/T shift from D3to D4at the specified speed?
Read gear position, throttle opening and vehicle speed.
Specified speed when shifting from D
3to D4:
Refer to Shift schedule, AT-356.
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YesorNo
Ye s©GO TO 5.
No©Go to ª11. A/T Does Not Shift: D
3,D4º, AT-242.
5 CHECK LOCK-UP (D4TO D4L/U)
Does A/T perform lock-up at the specified speed?
Read vehicle speed, throttle position when lock-up duty becomes 94%.
Specified speed when lock-up occurs:
Refer to Shift schedule, AT-356.
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YesorNo
Ye s©GO TO 6.
No©Go to ª12. A/T Does Not Perform Lock-upº, AT-245.
6 CHECK HOLD LOCK-UP
Does A/T hold lock-up condition for more than 30 seconds?
YesorNo
Ye s©GO TO 7.
No©Go to ª13. A/T Does Not Hold Lock-up Conditionº, AT-247.
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TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
AT-73

Cruise Test Ð Part 2=NBAT0024S0405
1 CHECK STARTING GEAR (D1) POSITION
1. Confirm overdrive control switch is in ªONº position.
2. Confirm selector lever is in ªDº position.
3. Accelerate vehicle by half throttle again.
4. Does vehicle start from D
1?
Read gear position.
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YesorNo
Ye s©GO TO 2.
No©Go to ª16. Vehicle Does Not Start From D
1º, AT-252.
2 CHECK SHIFT UP AND SHIFT DOWN (D3TO D4TO D2)
1. Accelerate vehicle to 80 km/h (50 MPH) as shown in illustration.
2. Release accelerator pedal and then quickly depress it fully.
3. Does A/T shift from D
4to D2as soon as accelerator pedal is depressed fully?
Read gear position and throttle position.
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YesorNo
Ye s©GO TO 3.
No©Go to ª9. A/T Does Not Shift: D
3,D4Or Does Not Kickdown: D4,D2º, AT-236.
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TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
AT-75

Cruise Test Ð Part 3=NBAT0024S0406
1 VEHICLE SPEED D4POSITION
1. Confirm overdrive control switch is in ªONº position.
2. Confirm selector lever is in ªDº position.
3. Accelerate vehicle using half-throttle to D
4.
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©GO TO 2.
2 CHECK SHIFT DOWN (D4TO D3)
1. Release accelerator pedal.
2. Set overdrive control switch to ªOFFº position while driving in D
4.
3. Does A/T shift from D
4to D3(O/D OFF)?
Read gear position and vehicle speed.
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YesorNo
Ye s©GO TO 3.
No©Go to ª17. A/T Does Not Shift: D
4,D3, When Overdrive Control Switch ªONº,ªOFFº,
AT-253.
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TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Road Test (Cont'd)
AT-77

5 CHECK ENGINE BRAKE
Does vehicle decelerate by engine brake?
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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?
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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