2008 INFINITI QX56 low oil pressure

TM-136
< SYMPTOM DIAGNOSIS >
SYSTEM SYMPTOM
OK >> GO TO 2.
NG >> Refer to TM-125, "
Vehicle Does Not Creep Forward in "D" Position", TM-128, "Vehicle Cannot Be
Started from D1".
2.CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Refer to TM-32, "
CONSULT-III Functi on (TRANSMISSION)".
Do the self-diagnostic results indicate front brake sol enoid valve, direct clutch solenoid valve, accelerator
pedal position sensor, input speed sensor, output speed sensor and vehicle speed sensor signal?
YES >> Check the malfunctioning system. Refer to TM-82, "Diagnosis Procedure"TM-84, "Diagnosis Pro-
cedure", EC-382, "Diagnosis Procedure", TM-46, "Diagnosis Procedure", TM-49, "Diagnosis Pro-
cedure", TM-74, "Diagnosis Procedure".
NO >> GO TO 3.
3.CHECK A/T FLUID LEVEL
Check A/T fluid level. Refer to TM-178, "
Checking the A/T Fluid
(ATF)".
OK or NG
OK >> GO TO 4.
NG >> Refill ATF.
4.CHECK LINE PRESSURE
Check line pressure at the engine stall point. Refer to TM-187,
"Inspection and Judgment".
OK or NG
OK >> GO TO 7.
NG - 1 >> Line pressure high. GO TO 5.
NG - 2 >> Line pressure low. GO TO 6.
5.DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to TM-201, "
Control Valve with TCM and A/T Fluid Temperature Sen-
sor 2".
2. Disassemble A/T. Refer to TM-232, "
Disassembly".
3. Check the following items:
- Oil pump assembly. Refer to TM-250, "
Oil Pump".
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.
6.DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to TM-201, "
Control Valve with TCM and A/T Fluid Temperature Sen-
sor 2".
2. Disassemble A/T. Refer to TM-232, "
Disassembly".
3. Check the following items:
- Oil pump assembly. Refer to TM-250, "
Oil Pump".
- Power train system. Refer to TM-232, "
Disassembly".
- Transmission case. Refer to TM-232, "
Disassembly".
OK or NG
OK >> GO TO 7.
SAT638A
SAT494G
Revision: March 2010 2008 QX56

TM-138
< SYMPTOM DIAGNOSIS >
SYSTEM SYMPTOM
NO >> GO TO 2.
2.CHECK A/T FLUID LEVEL
Check A/T fluid level. Refer to TM-178, "
Checking the A/T Fluid
(ATF)".
OK or NG
OK >> GO TO 3.
NG >> Refill ATF.
3.CHECK LINE PRESSURE
Check line pressure at the engine stall point. Refer to TM-187,
"Inspection and Judgment".
OK or NG
OK >> GO TO 6.
NG - 1 >> Line pressure high. GO TO 4.
NG - 2 >> Line pressure low. GO TO 5.
4.DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to TM-201, "
Control Valve with TCM and A/T Fluid Temperature Sen-
sor 2".
2. Disassemble A/T. Refer to TM-232, "
Disassembly".
3. Check the following items:
- Oil pump assembly. Refer to TM-250, "
Oil Pump".
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.
5.DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to TM-201, "
Control Valve with TCM and A/T Fluid Temperature Sen-
sor 2".
2. Disassemble A/T. Refer to TM-232, "
Disassembly".
3. Check the following items:
- Oil pump assembly. Refer to TM-250, "
Oil Pump".
- Power train system. Refer to TM-232, "
Disassembly".
- Transmission case. Refer to TM-232, "
Disassembly".
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.
6.CHECK A/T FLUID CONDITION
1. Remove oil pan. Refer to TM-199, "
Oil Pan".
SAT638A
SAT494G
Revision: March 2010 2008 QX56

SYSTEM SYMPTOMTM-159
< SYMPTOM DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
22
Slips/Will
Not En-
gage When “D” position, re-
mains in 5GR.
ON vehicle1. Fluid level and state
TM-178
2. Output speed sensor and vehicle speed sensor TM-48,
TM-74
3. Front brake solenoid valve TM-82
4. Line pressure testTM-187
5. CAN communication line LAN-4
6. Control valve with TCMTM-201
OFF vehicle7. Front brake (brake band)
TM-2208. Input clutchTM-254
9. Gear systemTM-220
10. High and low reverse clutchTM-264
23Vehicle cannot be
started from D
1.
Refer to TM-128, "
Ve-
hicle Cannot Be Start-
ed from D1". ON vehicle
1. Fluid level and state
TM-178
2. Accelerator pedal position sensor TM-69
3. Line pressure testTM-187
4. CAN communication line LAN-4
5. Control valve with TCMTM-201
OFF vehicle6. Torque converter
TM-232
7. Oil pump assemblyTM-250
8. 3rd one-way clutchTM-252
9. 1st one-way clutchTM-259
10. Gear systemTM-220
11. Reverse brakeTM-232
12. Forward one-way clutch (Parts behind drum support is im-
possible to perform inspection by disassembly. Refer to TM-
8, TM-9
TM-232
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to TM-8
, TM-9TM-232
24 Does not lock-up.
Refer to
TM-137, "A/T
Does Not Perform
Lock-up"
ON vehicle 1. Fluid level and state
TM-178
2. Line pressure testTM-187
3. Engine speed signal TM-51
4. Input speed sensorTM-46
5. Torque converter clutch solenoid valveTM-63
6. CAN communication line LAN-4
7. Control valve with TCMTM-201
OFF vehicle8. Torque converter
TM-2329. Oil pump assemblyTM-250
No. ItemsSymptom Condition Diagnostic ItemReference
page
Revision: March 2010 2008 QX56

SYSTEM SYMPTOMTM-161
< SYMPTOM DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
28
Slips/Will
Not en-
gage No shock at all or the
clutch slips when vehi-
cle changes speed D2
→
D3. ON vehicle
1. Fluid level and state
TM-178
2. Output speed sensor and vehicle speed sensor TM-48,
TM-74
3. High and low reverse clutch solenoid valve TM-86
4. CAN communication line LAN-4
5. Line pressure testTM-187
6. Control valve with TCMTM-201
OFF vehicle7. Torque converter
TM-232
8. Oil pump assemblyTM-250
9. 3rd one-way clutchTM-252
10. Gear systemTM-220
11. High and low reverse clutchTM-264
12. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
TM-8
, TM-9
TM-232
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to TM-8
, TM-9TM-232
29 No shock at all or the
clutch slips when vehi-
cle changes speed D3
→
D4. ON vehicle
1. Fluid level and state
TM-178
2. Output speed sensor and vehicle speed sensor TM-48,
TM-74
3. Input clutch solenoid valve TM-80
4. Front brake solenoid valveTM-82
5. CAN communication line LAN-4
6. Line pressure testTM-187
7. Control valve with TCMTM-201
OFF vehicle8. Torque converter
TM-232
9. Oil pump assemblyTM-250
10. Input clutchTM-254
11. Gear systemTM-220
12. High and low reverse clutchTM-264
13. Direct clutchTM-266
No. ItemsSymptom Condition Diagnostic ItemReference
page
Revision: March 2010 2008 QX56

TM-162
< SYMPTOM DIAGNOSIS >
SYSTEM SYMPTOM
30Slips/Will
Not en-
gage No shock at all or the
clutch slips when vehi-
cle changes speed D4
→ D5.
ON vehicle
1. Fluid level and state
TM-178
2. Output speed sensor and vehicle speed sensor TM-48,
TM-74
3. Front brake solenoid valve TM-82
4. Direct clutch solenoid valveTM-84
5. CAN communication line LAN-4
6. Line pressure testTM-187
7. Control valve with TCMTM-201
OFF vehicle8. Torque converter
TM-232
9. Oil pump assemblyTM-250
10. Front brake (brake band)TM-220
11. Input clutchTM-254
12. Gear systemTM-220
13. High and low reverse clutchTM-264
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
TM-178
2. Output speed sensor and vehicle speed sensor TM-48,
TM-74
3. Front brake solenoid valve TM-82
4. Direct clutch solenoid valveTM-84
5. CAN communication line LAN-4
6. Line pressure testTM-187
7. Control valve with TCMTM-201
OFF vehicle8. Torque converter
TM-232
9. Oil pump assemblyTM-250
10. Input clutchTM-254
11. Gear systemTM-220
12. High and low reverse clutchTM-264
13. Direct clutchTM-266
No. ItemsSymptom Condition Diagnostic ItemReference
page
Revision: March 2010 2008 QX56

SYSTEM SYMPTOMTM-163
< SYMPTOM DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
32
Slips/Will
Not en-
gage 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
TM-178
2. Output speed sensor and vehicle speed sensor TM-48,
TM-74
3. Input clutch solenoid valve TM-80
4. Front brake solenoid valveTM-82
5. CAN communication line LAN-4
6. Line pressure testTM-187
7. Control valve with TCMTM-201
OFF vehicle8. Torque converter
TM-232
9. Oil pump assemblyTM-250
10. 3rd one-way clutchTM-252
11. Gear systemTM-220
12. High and low reverse clutchTM-264
13. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
TM-8
, TM-9
TM-232
14. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to TM-8
, TM-9TM-232
33 When you press the
accelerator pedal and
shift speed D3→ D2
the engine idles or the
transmission slips. ON vehicle
1. Fluid level and state
TM-178
2. Output speed sensor and vehicle speed sensor TM-48,
TM-74
3. High and low reverse clutch solenoid valve TM-86
4. Direct clutch solenoid valveTM-84
5. CAN communication line LAN-4
6. Line pressure testTM-187
7. Control valve with TCMTM-201
OFF vehicle8. Torque converter
TM-232
9. Oil pump assemblyTM-250
10. 3rd one-way clutchTM-252
11. Gear systemTM-220
12. Direct clutchTM-266
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to TM-8
, TM-9TM-232
No. Items Symptom Condition Diagnostic ItemReference
page
Revision: March 2010 2008 QX56

SYSTEM SYMPTOMTM-165
< SYMPTOM DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
36
Slips/Will
Not En-
gage With selector lever in
“R” position, accelera-
tion is extremely poor.
ON vehicle1. Fluid level and state
TM-178
2. Line pressure testTM-187
3. Accelerator pedal position sensor TM-69
4. High and low reverse clutch solenoid valve LAN-4
5. CAN communication lineLAN-4
6. Transmission range switchTM-43
7. Control cable adjustmentTM-194
8. Control valve with TCMTM-201
OFF vehicle9. Gear system
TM-22010. Output shaftTM-232
11. Reverse brakeTM-232
37While starting off by
accelerating in 1st, en-
gine races or slippage
occurs. ON vehicle
1. Fluid level and state
TM-178
2. Line pressure testTM-187
3. Accelerator pedal position sensor TM-69
4. CAN communication line LAN-4
5. Control valve with TCMTM-201
OFF vehicle6. Torque converter
TM-232
7. Oil pump assemblyTM-250
8. 3rd one-way clutchTM-252
9. 1st one-way clutchTM-259
10. Gear systemTM-220
11. Reverse brakeTM-232
12. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
TM-8
, TM-9
TM-232
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to TM-8
, TM-9TM-232
38 While accelerating in
2nd, engine races or
slippage occurs. ON vehicle
1. Fluid level and state
TM-178
2. Line pressure testTM-187
3. Accelerator pedal position sensor TM-69
4. CAN communication line LAN-4
5. Direct clutch solenoid valveTM-84
6. Control valve with TCMTM-201
OFF vehicle7. Torque converter
TM-232
8. Oil pump assemblyTM-250
9. 3rd one-way clutchTM-252
10. Gear systemTM-220
11. Direct clutchTM-266
12. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to TM-8
, TM-9TM-232
No. Items Symptom Condition Diagnostic ItemReference
page
Revision: March 2010 2008 QX56

TM-166
< SYMPTOM DIAGNOSIS >
SYSTEM SYMPTOM
39Slips/Will
Not En-
gage While accelerating in
3rd, engine races or
slippage occurs.
ON vehicle
1. Fluid level and state
TM-178
2. Line pressure testTM-187
3. Accelerator pedal position sensor TM-69
4. CAN communication line LAN-4
5. High and low reverse clutch solenoid valveTM-86
6. Control valve with TCMTM-201
OFF vehicle7. Torque converter
TM-232
8. Oil pump assemblyTM-250
9. 3rd one-way clutchTM-252
10. Gear systemTM-220
11. High and low reverse clutchTM-264
12. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
TM-8
, TM-9
TM-232
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to TM-8
, TM-9TM-232
40 While accelerating in
4th, engine races or
slippage occurs. ON vehicle
1. Fluid level and state
TM-178
2. Line pressure testTM-187
3. Accelerator pedal position sensor TM-69
4. CAN communication line LAN-4
5. Input clutch solenoid valveTM-80
6. Control valve with TCMTM-201
OFF vehicle7. Torque converter
TM-232
8. Oil pump assemblyTM-250
9. Input clutchTM-254
10. Gear systemTM-220
11. High and low reverse clutchTM-264
12. Direct clutchTM-266
No. ItemsSymptom Condition Diagnostic ItemReference
page
Revision: March 2010 2008 QX56