2005 INFINITI QX4 oil

TROUBLE DIAGNOSIS
AT-75
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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

AT-76
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
44
Slips/Will
Not
EngageVehicle cannot run in
all positions.ON vehicle1. Fluid level and stateAT-5 0
2. Line pressure testAT-5 1
3. PNP switchAT- 1 0 4
4. Control cable adjustmentAT- 2 2 8
5. Control valve with TCMAT- 2 3 1
OFF vehicle6. Oil pump assemblyAT- 2 8 07. Gear systemAT- 2 5 0
8. Output shaftAT- 2 6 2
45With selector lever in
“D” position, driving is
not possible.ON vehicle1. Fluid level and stateAT-5 0
2. Line pressure testAT-5 1
3. PNP switchAT- 1 0 4
4. Control cable adjustmentAT- 2 2 8
5. Control valve with TCMAT- 2 3 1
OFF vehicle6. Torque converterAT- 2 6 2
7. Oil pump assembly AT- 2 8 0
8. 1st one-way clutchAT- 2 8 9
9. Gear systemAT- 2 5 0
10. Reverse brakeAT- 2 6 2
11. 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
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
46With selector lever in
“R” position, driving is
not possible.ON vehicle1. Fluid level and stateAT-5 0
2. Line pressure testAT-5 1
3. PNP switchAT- 1 0 4
4. Control cable adjustmentAT- 2 2 8
5. Control valve with TCMAT- 2 3 1
OFF vehicle6. Gear systemAT- 2 5 07. Output shaftAT- 2 6 2
8. Reverse brakeAT- 2 6 2
47 OthersShift point is high 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. ATF temperature sensorAT- 1 2 6
5. Control valve with TCMAT- 2 3 1
No. Items Symptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSIS
AT-77
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Revision: October 20052005 QX56
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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

TROUBLE DIAGNOSIS
AT-79
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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

DTC P0745 LINE PRESSURE SOLENOID VALVE
AT-119
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Revision: October 20052005 QX56
DTC P0745 LINE PRESSURE SOLENOID VALVEPFP:31940
DescriptionECS00CFZ
The line pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in
response to a signal sent from the TCM.
The line pressure duty cycle value is not consistent when the closed throttle position signal is “ON”.
To confirm the line pressure duty cycle at low pressure, the accelerator (throttle) should be open until
the closed throttle position signal is “OFF”.
CONSULT-II Reference ValueECS00CG0
On Board Diagnosis LogicECS00CG1

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “P0745 L/PRESS SOL/CIRC” with CONSULT-II is detected under the following
conditions.
–When TCM detects an improper voltage drop when it tries to operate the solenoid valve.
–When TCM detects as irregular by comparing target value with monitor value.
Possible CauseECS00CG2

Harness or connectors
(The solenoid circuit is open or shorted.)

Line pressure solenoid valve
DTC Confirmation ProcedureECS00CG3
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”
and wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1. Turn ignition switch “ON” and select “DATA MONITOR” mode for
“ENGINE” with CONSULT-II.
2. Engine start and wait at least 5 second.
3. If DTC is detected, go to AT-120, "
Diagnostic Procedure" .
WITH GST
Follow the procedure “With CONSULT-II”.
Item name Condition Display value (Approx.)
LINE PRES SOL During driving 0.2 - 0.6 A
BCIA0030E

AT-182
TROUBLE DIAGNOSIS FOR SYMPTOMS
Revision: October 20052005 QX56
3. CHECK A/T FLUID CONDITION
1. Remove oil pan. Refer to AT-231, "
Control Valve With TCM and A/T Fluid Temperature Sensor 2" .
2. Check A/T fluid condition. Refer to AT - 1 3 , "
Checking A/T Fluid" .
OK or NG
OK >>INSPECTION END
NG >> GO TO 4.
4. DETECT MALFUNCTIONING ITEM

Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to AT-60,
"Symptom Chart" (Symptom No.58).
OK or NG
OK >>INSPECTION END
NG >> Repair or replace damaged parts.
In “N” Position, Vehicle MovesECS00CK6
SYMPTOM:
Vehicle moves forward or backward when selecting “N” position.
DIAGNOSTIC PROCEDURE
1. CHECK PNP SWITCH CIRCUIT
Perform self-diagnosis. Refer to AT- 8 5 , "
SELF-DIAGNOSTIC RESULT MODE" .
Do the self-diagnostic results indicate PNP switch?
YES >> Check the malfunctioning system. Refer to AT-104, "DTC P0705 PARK/NEUTRAL POSITION
SWITCH" .
NO >> GO TO 2.
2. CHECK CONTROL CABLE
Check the control cable.

Refer to AT-228, "Checking of A/T Position" .
OK or NG
OK >> GO TO 3.
NG >> Adjust control cable. Refer to AT-228, "
Adjustment of A/
T Position" .
SCIA5199E
LCIA0345E

TROUBLE DIAGNOSIS FOR SYMPTOMS
AT-183
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Revision: October 20052005 QX56
3. CHECK A/T FLUID LEVEL
Check A/T fluid level. Refer to AT- 1 3 , "
Checking A/T Fluid" .
OK or NG
OK >> GO TO 4.
NG >> Refill ATF.
4. CHECK A/T FLUID CONDITION
1. Remove oil pan. Refer to AT-231, "
Control Valve With TCM and A/T Fluid Temperature Sensor 2" .
2. Check A/T fluid condition. Refer to AT- 1 3 , "
Checking A/T Fluid" .
OK or NG
OK >> GO TO 5.
NG >> Check the malfunction items. If any items are damaged,
repair or replace damaged parts. Refer to AT-60, "
Symp-
tom Chart" (Symptom No.60).
5. CHECK SYMPTOM
Check again. Refer to AT- 5 4 , "
Check at Idle" .
OK or NG
OK >>INSPECTION END
NG >> GO TO 6.
6. PERFORM TCM INSPECTION
1. Perform TCM input/output signals inspection. Refer to AT-82, "
TCM Input/Output Signal Reference Val-
ues" .
2. If NG, recheck A/T assembly harness connector terminals for damage or loose connection with harness
connector.
OK or NG
OK >>INSPECTION END
NG >> Repair or replace damaged parts.
Large Shock (“N” to “D” Position)ECS00CK7
SYMPTOM:
A noticeable shock occurs when the selector lever is shifted from the “N” to “D” position.
DIAGNOSTIC PROCEDURE
1. CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Refer to AT- 8 5 , "
SELF-DIAGNOSTIC RESULT MODE" .
Do the self-diagnostic results indicate A/T fluid temperature sensor, engine speed signal, accelerator pedal
position sensor, ATF pressure switch 1, front brake solenoid valve, CAN communication line?
YES >> Check the malfunctioning system. Refer to AT-126, "DTC P1710 A/T FLUID TEMPERATURE
SENSOR CIRCUIT" , AT- 11 3 , "DTC P0725 ENGINE SPEED SIGNAL" ., AT- 1 2 3 , "DTC P1705
SAT6 3 8A
SCIA5199E

TROUBLE DIAGNOSIS FOR SYMPTOMS
AT-185
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Revision: October 20052005 QX56
6. DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to AT-231, "
Control Valve With TCM and A/T Fluid Temperature Sen-
sor 2" .
2. Disassemble A/T. Refer to AT- 2 6 2 , "
Disassembly" .
3. Check the following items:
–Oil pump assembly. Refer to AT-280, "Oil Pump" .
OK or NG
OK >> GO TO 8.
NG >> Repair or replace damaged parts.
7. DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to AT-231, "
Control Valve With TCM and A/T Fluid Temperature Sen-
sor 2" .
2. Disassemble A/T. Refer to AT- 2 6 2 , "
Disassembly" .
3. Check the following items:
–Oil pump assembly. Refer to AT-280, "Oil Pump" .
–Power train system. Refer to AT- 2 6 2 , "Disassembly" .
–Transmission case. Refer to AT - 2 6 2 , "Disassembly" .
OK or NG
OK >> GO TO 8.
NG >> Repair or replace damaged parts.
8. CHECK A/T FLUID CONDITION
1. Remove oil pan. Refer to AT-231, "
Control Valve With TCM and A/T Fluid Temperature Sensor 2" .
2. Check A/T fluid condition. Refer to AT- 1 3 , "
Checking A/T Fluid" .
OK or NG
OK >> GO TO 10.
NG >> GO TO 9.
9. DETECT MALFUNCTIONING ITEM

Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to AT-60,
"Symptom Chart" (Symptom No.1).
OK or NG
OK >> GO TO 10.
NG >> Repair or replace damaged parts.
10. CHECK SYMPTOM
Check again. Refer to AT- 5 4 , "
Check at Idle" .
OK or NG
OK >>INSPECTION END
NG >> GO TO 11.
SCIA5199E