2005 INFINITI QX4 engine

AT-72
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
34
Slips/Will
Not
EngageWhen you press the
accelerator pedal and
shift speed D2 → D1
the engine idles or the
transmission slips.ON vehicle1. Fluid level and stateAT-5 0
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 3
3. ATF pressure switch 5 and direct clutch solenoid valveAT- 1 6 4,
AT- 1 4 8
4. CAN communication lineAT-9 5
5. Line pressure testAT-5 1
6. Control valve with TCMAT- 2 3 1
OFF vehicle7. Torque converterAT- 2 6 2
8. Oil pump assemblyAT- 2 8 0
9. 3rd one-way clutchAT- 2 8 2
10. 1st one-way clutchAT- 2 8 9
11. Gear systemAT- 2 5 0
12. Reverse brakeAT- 2 6 2
13. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT-1 6
, AT-1 7 .)AT- 2 6 2
14. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT-1 6
, AT- 1 7
.)AT- 2 6 2
35With selector lever in
“D” position, accelera-
tion is extremely poor.ON vehicle1. Fluid level and stateAT-5 0
2. Line pressure testAT-5 1
3. Accelerator pedal position sensorAT- 1 2 3
4. CAN communication lineAT-9 5
5. PNP switchAT- 1 0 4
6. Control cable adjustmentAT- 2 2 8
7. Control valve with TCMAT- 2 3 1
OFF vehicle8. Torque converterAT- 2 6 2
9. Oil pump assemblyAT- 2 8 0
10. 1st one-way clutchAT- 2 8 9
11. Gear systemAT- 2 5 0
12. Reverse brakeAT- 2 6 2
13. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT-1 6
, AT-1 7 .)AT- 2 6 2
14. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT-1 6
, AT- 1 7
.)AT- 2 6 2
No. Items Symptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSIS
AT-73
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: October 20052005 QX56
36
Slips/Will
Not
EngageWith selector lever in
“R” position, accelera-
tion is extremely poor.ON vehicle1. Fluid level and stateAT- 5 0
2. Line pressure testAT- 5 1
3. Accelerator pedal position sensorAT- 1 2 3
4. ATF pressure switch 6, high and low reverse clutch sole-
noid valveAT- 1 6 6,
AT- 1 5 2
5. CAN communication lineAT- 9 5
6. PNP switchAT- 1 0 4
7. Control cable adjustmentAT- 2 2 8
8. Control valve with TCMAT- 2 3 1
OFF vehicle9. Gear systemAT- 2 5 010. Output shaftAT- 2 6 2
11. Reverse brakeAT- 2 6 2
37While starting off by
accelerating in 1st,
engine races or slip-
page occurs.ON vehicle1. Fluid level and stateAT- 5 0
2. Line pressure testAT- 5 1
3. Accelerator pedal position sensorAT- 1 2 3
4. CAN communication lineAT- 9 5
5. Control valve with TCMAT- 2 3 1
OFF vehicle6. Torque converterAT- 2 6 2
7. Oil pump assemblyAT- 2 8 0
8. 3rd one-way clutchAT- 2 8 2
9. 1st one-way clutchAT- 2 8 9
10. Gear systemAT- 2 5 0
11. Reverse brakeAT- 2 6 2
12. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT- 1 6
, AT-1 7 .)AT- 2 6 2
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 6
, AT- 1 7
.)AT- 2 6 2
38While accelerating in
2nd, engine races or
slippage occurs.ON vehicle1. Fluid level and stateAT- 5 0
2. Line pressure testAT- 5 1
3. Accelerator pedal position sensorAT- 1 2 3
4. CAN communication lineAT- 9 5
5. ATF pressure switch 5 and direct clutch solenoid valveAT- 1 6 4,
AT- 1 4 8
6. Control valve with TCMAT- 2 3 1
OFF vehicle7. Torque converterAT- 2 6 2
8. Oil pump assemblyAT- 2 8 0
9. 3rd one-way clutchAT- 2 8 2
10. Gear systemAT- 2 5 0
11. Direct clutchAT- 2 9 6
12. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 6
, AT- 1 7
.)AT- 2 6 2
No. Items Symptom Condition Diagnostic ItemReference
page

AT-74
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
39
Slips/Will
Not
EngageWhile accelerating in
3rd, engine races or
slippage occurs.ON vehicle1. Fluid level and stateAT-5 0
2. Line pressure testAT-5 1
3. Accelerator pedal position sensorAT- 1 2 3
4. CAN communication lineAT-9 5
5. ATF pressure switch 6, high and low reverse clutch sole-
noid valveAT- 1 6 6,
AT- 1 5 2

6. Control valve with TCMAT- 2 3 1
OFF vehicle7. Torque converterAT- 2 6 2
8. Oil pump assemblyAT- 2 8 0
9. 3rd one-way clutchAT- 2 8 2
10. Gear systemAT- 2 5 0
11. High and low reverse clutchAT- 2 9 4
12. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT-1 6
, AT-1 7 .)AT- 2 6 2
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT-1 6
, AT- 1 7
.)AT- 2 6 2
40While accelerating in
4th, engine races or
slippage occurs.ON vehicle1. Fluid level and stateAT-5 0
2. Line pressure testAT-5 1
3. Accelerator pedal position sensorAT- 1 2 3
4. CAN communication lineAT-9 5
5. ATF pressure switch 3 and input clutch solenoid valveAT- 1 6 2,
AT- 1 4 0
6. Control valve with TCMAT- 2 3 1
OFF vehicle7. Torque converterAT- 2 6 2
8. Oil pump assemblyAT- 2 8 0
9. Input clutchAT- 2 8 4
10. Gear systemAT- 2 5 0
11. High and low reverse clutchAT- 2 9 4
12. Direct clutchAT- 2 9 6
No. Items Symptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSIS
AT-75
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: October 20052005 QX56
41
Slips/Will
Not
Engage While accelerating in
5th, engine races or
slippage occurs.ON vehicle1. Fluid level and stateAT- 5 0
2. Line pressure testAT- 5 1
3. Accelerator pedal position sensorAT- 1 2 3
4. CAN communication lineAT- 9 5
5. ATF pressure switch 1 and front brake solenoid valveAT- 1 6 0,
AT- 1 4 4
6. Control valve with TCMAT- 2 3 1
OFF vehicle7. Torque converterAT- 2 6 2
8. Oil pump assemblyAT- 2 8 0
9. Front brake (brake band)AT- 2 6 2
10. Input clutchAT- 2 8 4
11. Gear systemAT- 2 5 0
12. High and low reverse clutchAT- 2 9 4
42 Slips at lock-up.ON vehicle1. Fluid level and stateAT- 5 0
2. Line pressure testAT- 5 1
3. Engine speed signalAT- 11 3
4. Turbine revolution sensorAT- 1 3 1
5. Torque converter clutch solenoid valveAT- 11 5
6. CAN communication lineAT- 9 5
7. Control valve with TCMAT- 2 3 1
OFF vehicle8. Torque converterAT- 2 6 29. Oil pump assemblyAT- 2 8 0
43No creep at all.
Refer toAT- 1 8 7 , "
Vehi-
cle Does Not Creep
Backward In “R” Posi-
tion" , AT- 1 9 0 , "Ve h i -
cle Does Not Creep
Forward In “D” Posi-
tion"
ON vehicle1. Fluid level and stateAT- 5 0
2. Line pressure testAT- 5 1
3. Accelerator pedal position sensorAT- 1 2 3
4. ATF pressure switch 5 and direct clutch solenoid valveAT- 1 6 4,
AT- 1 4 8
5. PNP switchAT- 1 0 4
6. CAN communication lineAT- 9 5
7. Control cable adjustmentAT- 2 2 8
8. Control valve with TCMAT- 2 3 1
OFF vehicle9. Torque converterAT- 2 6 2
10. Oil pump assemblyAT- 2 8 0
11. 1st one-way clutchAT- 2 8 9
12. Gear systemAT- 2 5 0
13. Reverse brakeAT- 2 6 2
14. Direct clutchAT- 2 9 6
15. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT- 1 6
, AT-1 7 .)AT- 2 6 2
16. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 6
, AT- 1 7
.)AT- 2 6 2
No. Items Symptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSIS
AT-77
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: October 20052005 QX56
48
OthersShift point is low in “D”
position.ON vehicle1. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8
,
AT- 1 3 3
2. Accelerator pedal position sensorAT- 1 2 3
3. CAN communication lineAT- 9 5
4. Control valve with TCMAT- 2 3 1
49Judder occurs during
lock-up.ON vehicle1. Fluid level and stateAT- 5 0
2. Engine speed signalAT- 11 3
3. Turbine revolution sensorAT- 1 3 1
4. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 3
5. Accelerator pedal position sensorAT- 1 2 3
6. CAN communication lineAT- 9 5
7. Torque converter clutch solenoid valveAT- 11 5
8. Control valve with TCMAT- 2 3 1
OFF vehicle 9. Torque converterAT- 2 6 2
50Strange noise in “R”
position.ON vehicle1. Fluid level and stateAT- 5 0
2. Engine speed signalAT- 11 3
3. CAN communication lineAT- 9 5
4. Control valve with TCMAT- 2 3 1
OFF vehicle5. Torque converterAT- 2 6 2
6. Oil pump assemblyAT- 2 8 0
7. Gear systemAT- 2 5 0
8. High and low reverse clutchAT- 2 9 4
9. Reverse brakeAT- 2 6 2
51Strange noise in “N”
position.ON vehicle1. Fluid level and stateAT- 5 0
2. Engine speed signalAT- 11 3
3. CAN communication lineAT- 9 5
4. Control valve with TCMAT- 2 3 1
OFF vehicle5. Torque converterAT- 2 6 26. Oil pump assemblyAT- 2 8 0
7. Gear systemAT- 2 5 0
52Strange noise in “D”
position.ON vehicle1. Fluid level and stateAT- 5 0
2. Engine speed signalAT- 11 3
3. CAN communication lineAT- 9 5
4. Control valve with TCMAT- 2 3 1
OFF vehicle5. Torque converterAT- 2 6 2
6. Oil pump assemblyAT- 2 8 0
7. Gear systemAT- 2 5 0
8. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 6
, AT- 1 7
.)AT- 2 6 2
No. Items Symptom Condition Diagnostic ItemReference
page

AT-78
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
53
OthersVehicle dose not
decelerate by engine
brake.
Refer to AT-219,
"Vehicle Does Not
Decelerate By Engine
Brake" .ON vehicle1. PNP switchAT- 1 0 4
2. Fluid level and stateAT-5 0
3. Control cable adjustmentAT- 2 2 8
4. 1st position switchAT- 2 1 9
5. ATF pressure switch 5AT- 1 6 4
6. CAN communication lineAT-9 5
7. Control valve with TCMAT- 2 3 1
OFF vehicle8. Input clutchAT- 2 8 49. High and low reverse clutchAT- 2 9 4
10. Direct clutchAT- 2 9 6
54Engine brake does
not operate in “2”
position.ON vehicle1. PNP switchAT- 1 0 4
2. Fluid level and stateAT-5 0
3. Control cable adjustmentAT- 2 2 8
5. ATF pressure switch 6AT- 1 6 6
6. CAN communication lineAT-9 5
7. Control valve with TCMAT- 2 3 1
OFF vehicle8. Front brake (brake band)AT- 2 6 29. Input clutchAT- 2 8 4
10. High and low reverse clutchAT- 2 9 4
55Engine brake does
not operate in “1”
position.ON vehicle1. PNP switchAT- 1 0 4
2. Fluid level and stateAT-5 0
3. Control cable adjustmentAT- 2 2 8
4. 1st position switchAT- 2 1 9
5. ATF pressure switch 5AT- 1 6 4
6. CAN communication lineAT-9 5
7. Control valve with TCMAT- 2 3 1
OFF vehicle8. Input clutchAT- 2 8 49. High and low reverse clutchAT- 2 9 4
10. Direct clutchAT- 2 9 6
No. Items Symptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSIS
AT-79
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: October 20052005 QX56
56
OthersMaximum speed low.ON vehicle1. Fluid level and stateAT- 5 0
2. Line pressure testAT- 5 1
3. Accelerator pedal position sensorAT- 1 2 3
4. CAN communication lineAT- 9 5
5. Direct clutch solenoid valveAT- 1 4 8
6. Control valve with TCMAT- 2 3 1
OFF vehicle7. Torque converterAT- 2 6 2
8. Oil pump assemblyAT- 2 8 0
9. Input clutchAT- 2 8 4
10. Gear systemAT- 2 5 0
11. High and low reverse clutchAT- 2 9 4
12. Direct clutchAT- 2 9 6
13. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT- 1 6
, AT-1 7 .)AT- 2 6 2
14 Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 6
, AT- 1 7
.)AT- 2 6 2
57Extremely large
creep.ON vehicle1. Engine idle speed EC-77

2. CAN communication lineAT- 9 5
3. ATF pressure switch 5AT- 1 6 4
OFF vehicle 4. Torque converterAT- 2 6 2
58With selector lever in
“P” position, vehicle
does not enter parking
condition or, with
selector lever in
another position, park-
ing condition is not
cancelled.
Refer to AT- 1 8 1 , "
In
“P” Position, Vehicle
Moves When Pushed"
.ON vehicle1. PNP switchAT- 1 0 4
2. Control cable adjustmentAT- 2 2 8
OFF vehicle 3. Parking pawl componentsAT- 2 5 0
59Vehicle runs with
transmission in “P”
position.ON vehicle1. PNP switchAT- 1 0 4
2. Fluid level and stateAT- 5 0
3. Control cable adjustmentAT- 2 2 8
4. Control valve with TCMAT- 2 3 1
5. Parking pawl componentsAT- 2 5 0
OFF vehicle 6. Gear systemAT- 2 5 0
No. Items Symptom Condition Diagnostic ItemReference
page

AT-80
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
60
OthersVehicle runs with
transmission in “N”
position.
Refer to AT-182, "In
“N” Position, Vehicle
Moves" .ON vehicle1. PNP switchAT- 1 0 4
2. Fluid level and stateAT-5 0
3. Control cable adjustmentAT- 2 2 8
4. Control valve with TCMAT- 2 3 1
OFF vehicle5. Input clutchAT- 2 8 4
6. Gear systemAT- 2 5 0
7. Direct clutchAT- 2 9 6
8. Reverse brakeAT- 2 6 2
9. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT-1 6
, AT-1 7 .)AT- 2 6 2
10. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT-1 6
, AT- 1 7
.)AT- 2 6 2
61Engine does not start
in “N” or “P” position.
Refer to AT-180, "Engine Cannot Be
Started In “P” or “N”
Position" .ON vehicle1. Ignition switch and starterPG-4
, SC-
10
2. Control cable adjustmentAT- 2 2 8
3. PNP switchAT- 1 0 4
62Engine starts in posi-
tions other than “N” or
“P”.ON vehicle1. Ignition switch and starterPG-4
, SC-
10
2. Control cable adjustmentAT- 2 2 8
3. PNP switchAT- 1 0 4
63 Engine stall.ON vehicle1. Fluid level and stateAT-5 0
2. Engine speed signalAT - 11 3
3. Turbine revolution sensorAT- 1 3 1
4. Torque converter clutch solenoid valveAT - 11 5
5. CAN communication lineAT-9 5
6. Control valve with TCMAT- 2 3 1
OFF vehicle 7. Torque converterAT- 2 6 2
64Engine stalls when
select lever shifted “N”
→ “D”, “R”.ON vehicle1. Fluid level and stateAT-5 0
2. Engine speed signalAT - 11 3
3. Turbine revolution sensorAT- 1 3 1
4. Torque converter clutch solenoid valveAT - 11 5
5. CAN communication lineAT-9 5
6. Control valve with TCMAT- 2 3 1
OFF vehicle 7. Torque converterAT- 2 6 2
No. Items Symptom Condition Diagnostic ItemReference
page