low oil pressure INFINITI QX56 2006 Factory User Guide

TROUBLE DIAGNOSISAT-71
DE
F
G H
I
J
K L
M A
B
AT
Revision: November 2009 2006 QX56
30
Slips/Will
Not
engage No shock at all or the
clutch slips when
vehicle changes
speed D
4 →
D5 . ON vehicle 1. Fluid level and state
AT- 5 1
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 111,
AT-132
3. ATF pressure switch 1 and front brake solenoid valve AT-159,
AT-143
4. ATF pressure switch 5 and direct clutch solenoid valve AT-163,
AT-147
5. CAN communication line AT- 9 6
6. Line pressure testAT- 5 2
7. Control valve with TCMAT-230
OFF vehicle8. Torque converter
AT-264
9. Oil pump assemblyAT-282
10. Front brake (brake band)AT-264
11. Input clutchAT-286
12. Gear systemAT-250
13. High and low reverse clutchAT-296
31When you press the
accelerator pedal and
shift speed D5 →
D4
the engine idles or the
transmission slips. ON vehicle
1. Fluid level and state
AT- 5 1
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 111,
AT-132
3. ATF pressure switch 1 and front brake solenoid valve AT-159,
AT-143
4. ATF pressure switch 5 and direct clutch solenoid valve AT-163,
AT-147
5. CAN communication line AT- 9 6
6. Line pressure testAT- 5 2
7. Control valve with TCMAT-230
OFF vehicle8. Torque converter
AT-264
9. Oil pump assemblyAT-282
10. Input clutchAT-286
11. Gear systemAT-250
12. High and low reverse clutchAT-296
13. Direct clutchAT-298
No. ItemsSymptom Condition Diagnostic ItemReference
page

AT-72
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
32
Slips/Will
Not
engage When you press the
accelerator pedal and
shift speed D4
→ D3
the engine idles or the
transmission slips. ON vehicle
1. Fluid level and state
AT- 5 1
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 111,
AT- 1 3 2
3. ATF pressure switch 3 and input clutch solenoid valve AT- 1 6 1,
AT- 1 3 9
4. ATF pressure switch 1 and front brake solenoid valve AT- 1 5 9,
AT- 1 4 3
5. CAN communication line AT- 9 6
6. Line pressure testAT- 5 2
7. Control valve with TCMAT- 2 3 0
OFF vehicle8. Torque converter
AT- 2 6 4
9. Oil pump assemblyAT- 2 8 2
10. 3rd one-way clutchAT- 2 8 4
11. Gear systemAT- 2 5 0
12. High and low reverse clutchAT- 2 9 6
13. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT- 1 7
, AT- 1 8 .) AT- 2 6 4
14. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
AT- 1 7
, AT- 1 8
.) AT- 2 6 4
33When you press the
accelerator pedal and
shift speed D3
→ D2
the engine idles or the
transmission slips. ON vehicle
1. Fluid level and state
AT- 5 1
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 111,
AT- 1 3 2
3. ATF pressure switch 6, high and low reverse clutch sole-
noid valve AT- 1 6 5,
AT- 1 5 1
4. ATF pressure switch 5 and direct clutch solenoid valve AT- 1 6 3,
AT- 1 4 7
5. CAN communication line AT- 9 6
6. Line pressure testAT- 5 2
7. Control valve with TCMAT- 2 3 0
OFF vehicle8. Torque converter
AT- 2 6 4
9. Oil pump assemblyAT- 2 8 2
10. 3rd one-way clutchAT- 2 8 4
11. Gear systemAT- 2 5 0
12. Direct clutchAT- 2 9 8
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 7
, AT- 1 8
.) AT- 2 6 4
No. Items
Symptom Condition Diagnostic ItemReference
page

AT-74
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
36
Slips/Will
Not
Engage With selector lever in
“
R ” position, accelera-
tion is extremely poor. ON vehicle1. Fluid level and state
AT- 5 1
2. Line pressure testAT- 5 2
3. Accelerator pedal position sensorAT- 1 2 4
4. ATF pressure switch 6, high and low reverse clutch sole-
noid valveAT- 1 6 5,
AT- 1 5 1
5. CAN communication line AT- 9 6
6. PNP switchAT- 1 0 5
7. Control cable adjustmentAT- 2 2 7
8. Control valve with TCMAT- 2 3 0
OFF vehicle9. Gear system
AT- 2 5 010. Output shaftAT- 2 6 4
11. Reverse brakeAT- 2 6 4
37While starting off by
accelerating in 1st,
engine races or slip-
page occurs. ON vehicle
1. Fluid level and state
AT- 5 1
2. Line pressure testAT- 5 2
3. Accelerator pedal position sensorAT- 1 2 4
4. CAN communication line AT- 9 6
5. Control valve with TCMAT- 2 3 0
OFF vehicle6. Torque converter
AT- 2 6 4
7. Oil pump assemblyAT- 2 8 2
8. 3rd one-way clutchAT- 2 8 4
9. 1st one-way clutchAT- 2 9 1
10. Gear systemAT- 2 5 0
11. Reverse brakeAT- 2 6 4
12. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT- 1 7
, AT- 1 8 .) AT- 2 6 4
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
AT- 1 7
, AT- 1 8
.) AT- 2 6 4
38While accelerating in
2nd, engine races or
slippage occurs. ON vehicle
1. Fluid level and state
AT- 5 1
2. Line pressure testAT- 5 2
3. Accelerator pedal position sensorAT- 1 2 4
4. CAN communication line AT- 9 6
5. ATF pressure switch 5 and direct clutch solenoid valveAT- 1 6 3,
AT- 1 4 7
6. Control valve with TCM AT- 2 3 0
OFF vehicle7. Torque converter
AT- 2 6 4
8. Oil pump assemblyAT- 2 8 2
9. 3rd one-way clutchAT- 2 8 4
10. Gear systemAT- 2 5 0
11. Direct clutchAT- 2 9 8
12. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 7
, AT- 1 8
.) AT- 2 6 4
No. Items
Symptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSISAT-75
DE
F
G H
I
J
K L
M A
B
AT
Revision: November 2009 2006 QX56
39
Slips/Will
Not
Engage While accelerating in
3rd, engine races or
slippage occurs.
ON vehicle
1. Fluid level and state
AT- 5 1
2. Line pressure testAT- 5 2
3. Accelerator pedal position sensorAT-124
4. CAN communication line AT- 9 6
5. ATF pressure switch 6, high and low reverse clutch sole-
noid valveAT-165,
AT-151

6. Control valve with TCM AT-230
OFF vehicle7. Torque converter
AT-264
8. Oil pump assemblyAT-282
9. 3rd one-way clutchAT-284
10. Gear systemAT-250
11. High and low reverse clutchAT-296
12. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT- 1 7
, AT- 1 8 .) AT-264
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 7
, AT- 1 8
.) AT-264
40While accelerating in
4th, engine races or
slippage occurs. ON vehicle
1. Fluid level and state
AT- 5 1
2. Line pressure testAT- 5 2
3. Accelerator pedal position sensorAT-124
4. CAN communication line AT- 9 6
5. ATF pressure switch 3 and input clutch solenoid valveAT-161,
AT-139
6. Control valve with TCM AT-230
OFF vehicle7. Torque converter
AT-264
8. Oil pump assemblyAT-282
9. Input clutchAT-286
10. Gear systemAT-250
11. High and low reverse clutchAT-296
12. Direct clutchAT-298
No. ItemsSymptom Condition Diagnostic ItemReference
page

AT-76
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
41
Slips/Will
Not
Engage While accelerating in
5th, engine races or
slippage occurs.
ON vehicle
1. Fluid level and state
AT- 5 1
2. Line pressure testAT- 5 2
3. Accelerator pedal position sensorAT- 1 2 4
4. CAN communication line AT- 9 6
5. ATF pressure switch 1 and front brake solenoid valveAT- 1 5 9,
AT- 1 4 3
6. Control valve with TCM AT- 2 3 0
OFF vehicle7. Torque converter
AT- 2 6 4
8. Oil pump assemblyAT- 2 8 2
9. Front brake (brake band)AT- 2 6 4
10. Input clutchAT- 2 8 6
11. Gear systemAT- 2 5 0
12. High and low reverse clutchAT- 2 9 6
42Slips at lock-up. ON vehicle1. Fluid level and state
AT- 5 1
2. Line pressure testAT- 5 2
3. Engine speed signalAT- 11 6
4. Turbine revolution sensorAT- 1 0 9
5. Torque converter clutch solenoid valve AT- 11 8
6. CAN communication line AT- 9 6
7. Control valve with TCMAT- 2 3 0
OFF vehicle8. Torque converter
AT- 2 6 49. Oil pump assemblyAT- 2 8 2
43No creep at all.
Refer to
AT-186, "
Vehi-
cle Does Not Creep
Backward In “R” Posi-
tion" , AT-189, "Ve h i-
cle Does Not Creep
Forward In “D” Posi-
tion"
ON vehicle 1. Fluid level and state
AT- 5 1
2. Line pressure testAT- 5 2
3. Accelerator pedal position sensorAT- 1 2 4
4. ATF pressure switch 5 and direct clutch solenoid valveAT- 1 6 3,
AT- 1 4 7
5. PNP switch AT- 1 0 5
6. CAN communication line AT- 9 6
7. Control cable adjustmentAT- 2 2 7
8. Control valve with TCMAT- 2 3 0
OFF vehicle9. Torque converter
AT- 2 6 4
10. Oil pump assemblyAT- 2 8 2
11. 1st one-way clutchAT- 2 9 1
12. Gear systemAT- 2 5 0
13. Reverse brakeAT- 2 6 4
14. Direct clutchAT- 2 9 8
15. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT- 1 7
, AT- 1 8 .) AT- 2 6 4
16. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
AT- 1 7
, AT- 1 8
.) AT- 2 6 4
No. Items
Symptom Condition Diagnostic ItemReference
page

AT-80
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
56
Others Maximum speed low.
ON vehicle
1. Fluid level and state
AT- 5 1
2. Line pressure testAT- 5 2
3. Accelerator pedal position sensorAT- 1 2 4
4. CAN communication line AT- 9 6
5. Direct clutch solenoid valveAT- 1 4 7
6. Control valve with TCMAT- 2 3 0
OFF vehicle7. Torque converter
AT- 2 6 4
8. Oil pump assemblyAT- 2 8 2
9. Input clutchAT- 2 8 6
10. Gear systemAT- 2 5 0
11. High and low reverse clutchAT- 2 9 6
12. Direct clutchAT- 2 9 8
13. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT- 1 7
, AT- 1 8 .) AT- 2 6 4
14 Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
AT- 1 7
, AT- 1 8
.) AT- 2 6 4
57
Extremely large
creep. ON vehicle1. Engine idle speed
EC-76

2. CAN communication line AT- 9 6
3. ATF pressure switch 5AT- 1 6 3
OFF vehicle 4. Torque converter AT- 2 6 4
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-180, "
In
“P” Position, Vehicle
Moves When Pushed"
. ON vehicle
1. PNP switch
AT- 1 0 5
2. Control cable adjustmentAT- 2 2 7
OFF vehicle 3. Parking pawl components AT- 2 5 0
59Vehicle runs with
transmission in
“P ”
position. ON vehicle1. PNP switch
AT- 1 0 5
2. Fluid level and state AT- 5 1
3. Control cable adjustmentAT- 2 2 7
4. Control valve with TCMAT- 2 3 0
5. Parking pawl componentsAT- 2 5 0
OFF vehicle 6. Gear system AT- 2 5 0
No. ItemsSymptom Condition Diagnostic ItemReference
page

AT-122
DTC P0745 LINE PRESSURE SOLENOID VALVE
Revision: November 20092006 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- 1 2 3 , "
Diagnostic Procedure" .
WITH GST
Follow the procedure “With CONSULT-II”.
Item name Condition Display value (Approx.)
LINE PRES SOL During driving0.2 - 0.6 A
BCIA0030E

TROUBLE DIAGNOSIS FOR SYMPTOMSAT-187
DE
F
G H
I
J
K L
M A
B
AT
Revision: November 2009 2006 QX56
5. DETECT MALFUNCTIONING ITEM
1. Disassemble A/T. Refer to AT- 2 6 4 , "
Disassembly" .
2. Check the following items:
–Reverse brake. Refer to AT- 2 6 4 , "Disassembly" .
OK or NG
OK >> GO TO 9.
NG >> Repair or replace damaged parts.
6. CHECK LINE PRESSURE
Check the line pressure with the engine idling. Refer to AT- 5 2 , "
LINE
PRESSURE TEST" .
OK or NG
OK >> GO TO 9.
NG - 1 >> Line pressure high. GO TO 7.
NG - 2 >> Line pressure low. GO TO 8.
7. DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to AT- 2 3 0 , "
Control Valve With TCM and A/T Fluid Temperature Sen-
sor 2" .
2. Disassemble A/T. Refer to AT- 2 6 4 , "
Disassembly" .
3. Check the following items:
–Oil pump assembly. Refer to AT- 2 8 2 , "Oil Pump" .
OK or NG
OK >> GO TO 9.
NG >> Repair or replace damaged parts.
8. DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to AT- 2 3 0 , "
Control Valve With TCM and A/T Fluid Temperature Sen-
sor 2" .
2. Disassemble A/T. Refer to AT- 2 6 4 , "
Disassembly" .
3. Check the following items:
–Oil pump assembly. Refer to AT- 2 8 2 , "Oil Pump" .
–Power train system. Refer to AT- 2 6 4 , "Disassembly" .
–Transmission case. Refer to AT- 2 6 4 , "Disassembly" .
OK or NG
OK >> GO TO 9.
NG >> Repair or replace damaged parts.
SAT494G

AT-190
TROUBLE DIAGNOSIS FOR SYMPTOMS
Revision: November 20092006 QX56
5. CHECK LINE PRESSURE
Check line pressure at idle with selector lever in “D” position. Refer
to AT- 5 2 , "
LINE PRESSURE TEST" .
OK or NG
OK >> GO TO 8.
NG - 1 >> Line pressure high. GO TO 6.
NG - 2 >> Line pressure low. GO TO 7.
6. DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to AT- 2 3 0 , "
Control Valve With TCM and A/T Fluid Temperature Sen-
sor 2" .
2. Disassemble A/T. Refer to AT- 2 6 4 , "
Disassembly" .
3. Check the following items:
–Oil pump assembly. Refer to AT- 2 8 2 , "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- 2 3 0 , "
Control Valve With TCM and A/T Fluid Temperature Sen-
sor 2" .
2. Disassemble A/T. Refer to AT- 2 6 4 , "
Disassembly" .
3. Check the following items:
–Oil pump assembly. Refer to AT- 2 8 2 , "Oil Pump" .
–Power train system. Refer to AT- 2 6 4 , "Disassembly" .
–Transmission case. Refer to AT- 2 6 4 , "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- 2 3 0 , "
Control Valve With TCM and A/T Fluid Temperature Sensor 2" .
2. Check A/T fluid condition. Refer to AT- 5 1 , "
Fluid Condition
Check" .
OK or NG
OK >> GO TO 9.
NG >> GO TO 12.
SAT494G
SCIA5199E

AT-192
TROUBLE DIAGNOSIS FOR SYMPTOMS
Revision: November 20092006 QX56
3. CHECK ACCELERATOR PEDAL POSITION (APP) SENSOR
Check accelerator pedal position (APP) sensor. Refer to AT- 1 2 4 , "
DTC P1705 THROTTLE POSITION SEN-
SOR"
OK or NG
OK >> GO TO 4.
NG >> Repair or replace accelerator pedal position (APP) sensor.
4. CHECK A/T FLUID LEVEL
Check A/T fluid level. Refer to AT- 1 2 , "
Checking Automatic Trans-
mission Fluid (ATF)" .
OK or NG
OK >> GO TO 5.
NG >> Refill ATF.
5. CHECK LINE PRESSURE
Check line pressure at the engine stall point. Refer to AT- 5 2 , "
LINE
PRESSURE TEST" .
OK or NG
OK >> GO TO 8.
NG - 1 >> Line pressure high. GO TO 6.
NG - 2 >> Line pressure low. GO TO 7.
6. DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to AT- 2 3 0 , "
Control Valve With TCM and A/T Fluid Temperature Sen-
sor 2" .
2. Disassemble A/T. Refer to AT- 2 6 4 , "
Disassembly" .
3. Check the following items:
–Oil pump assembly. Refer to AT- 2 8 2 , "Oil Pump" .
OK or NG
OK >> GO TO 8.
NG >> Repair or replace damaged parts.
SAT638A
SAT494G