2008 INFINITI QX56 clutch

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

SYSTEM SYMPTOMTM-137
< SYMPTOM DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
NG >> Repair or replace damaged parts.
7.CHECK A/T FLUID CONDITION
1. Remove oil pan. Refer to TM-199, "
Oil Pan".
2. Check A/T fluid condition. Refer to TM-178, "
Checking the A/T
Fluid (ATF)".
OK or NG
OK >> GO TO 8.
NG >> GO TO 11.
8.DETECT MALFUNCTIONING ITEM
• Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to TM-151,
"Symptom Table" (Symptom No.13).
OK or NG
OK >> GO TO 9.
NG >> Repair or replace damaged parts.
9.CHECK SYMPTOM
Check again. Refer to TM-190, "
Cruise Test - Part 1".
OK or NG
OK >> INSPECTION END
NG >> GO TO 10.
10.PERFORM TCM INSPECTION
1. Perform TCM input/output signals inspection. Refer to TM-103, "
Reference Value".
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.
11 .DETECT MALFUNCTIONING ITEM
• Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to TM-151,
"Symptom Table" (Symptom No.13).
OK or NG
OK >> GO TO 9.
NG >> Repair or replace damaged parts.
A/T Does Not Perform Lock-upINFOID:0000000001604191
SYMPTOM:
A/T does not perform lock-up at the specified speed.
DIAGNOSTIC PROCEDURE
1.CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Refer to TM-32, "
CONSULT-III Function (TRANSMISSION)".
Do the self-diagnostic results indicate torque converter clutch solenoid valve, engine speed signal, input
speed sensor, accelerator pedal position sensor, CAN communication?
YES >> Check the malfunctioning system. Refer to TM-63, "Diagnosis Procedure", TM-51, "Diagnosis
Procedure", TM-46, "Diagnosis Procedure", EC-382, "Diagnosis Procedure", TM-38, "Diagnosis
Procedure".
SCIA5199E
Revision: March 2010 2008 QX56

SYSTEM SYMPTOMTM-139
< SYMPTOM DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
2. Check A/T fluid condition. Refer to TM-178, "Checking the A/T
Fluid (ATF)".
OK or NG
OK >> GO TO 7.
NG >> GO TO 10.
7.DETECT MALFUNCTIONING ITEM
• Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to TM-151,
"Symptom Table" (Symptom No.24).
OK or NG
OK >> GO TO 8.
NG >> Repair or replace damaged parts.
8.CHECK SYMPTOM
Check again. Refer to TM-190, "
Cruise Test - Part 1".
OK or NG
OK >> INSPECTION END
NG >> GO TO 9.
9.PERFORM TCM INSPECTION
1. Perform TCM input/output signals inspection. Refer to TM-103, "
Reference Value".
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.
10.DETECT MALFUNCTIONING ITEM
• Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to TM-151,
"Symptom Table" (Symptom No.24).
OK or NG
OK >> GO TO 8.
NG >> Repair or replace damaged parts.
A/T Does Not Hold Lock-up ConditionINFOID:0000000001604192
SYMPTOM:
The lock-up condition cannot be main tained for more than 30 seconds.
DIAGNOSTIC PROCEDURE
1.CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Refer to TM-32, "
CONSULT-III Function (TRANSMISSION)".
Do the self-diagnostic results indicate torque converter clutch solenoid valve, engine speed signal, input
speed sensor, CAN communication?
YES >> Check the malfunctioning system. Refer to TM-63, "Diagnosis Procedure", TM-51, "Diagnosis
Procedure", TM-46, "Diagnosis Procedure", TM-38, "Diagnosis Procedure".
NO >> GO TO 2.
2.CHECK A/T FLUID LEVEL
SCIA5199E
Revision: March 2010 2008 QX56

SYSTEM SYMPTOMTM-141
< SYMPTOM DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
DIAGNOSTIC PROCEDURE
1.CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Refer to TM-32, "
CONSULT-III Function (TRANSMISSION)".
Do the self-diagnostic results indicate torque converter clutch solenoid valve, engine speed signal, input
speed sensor, CAN communication?
YES >> Check the malfunctioning system. Refer to TM-63, "Diagnosis Procedure", TM-51, "Diagnosis
Procedure", TM-46, "Diagnosis Procedure", TM-38, "Diagnosis Procedure".
NO >> GO TO 2.
2.CHECK SYMPTOM
Check again. Refer to TM-190, "
Cruise Test - Part 1".
OK or NG
OK >> INSPECTION END
NG >> GO TO 3.
3.PERFORM TCM INSPECTION
1. Perform TCM input/output signals inspection. Refer to TM-103, "
Reference Value".
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.
Engine Speed Does Not Return to IdleINFOID:0000000001604194
SYMPTOM:
When a shift-down is performed, the engine speed does not smoothly return to the idling speed.
DIAGNOSTIC PROCEDURE
1.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 2.
NG >> Refill ATF.
2.CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Refer to TM-32, "
CONSULT-III Function (TRANSMISSION)".
Do the self-diagnostic results indicate front brake sol enoid valve, direct clutch solenoid valve, accelerator
pedal position sensor, output speed sensor and vehicle speed sensor signal?
YES >> Check the malfunctioning system. Refer to TM-82, "Diagnosis Procedure", TM-84, "Diagnosis
Procedure", EC-382, "Diagnosis Procedure", TM-49, "Diagnosis Procedure", TM-74, "Diagnosis
Procedure".
NO >> GO TO 3.
3.CHECK A/T FLUID CONDITION
1. Remove oil pan. Refer to TM-199, "
Oil Pan".
SAT638A
Revision: March 2010 2008 QX56

TM-152
< SYMPTOM DIAGNOSIS >
SYSTEM SYMPTOM
No. ItemsSymptom Condition Diagnostic ItemReference
page
1
Shift
Shock Large shock. (“N”
→“
D” position)
Refer to TM-121,
"Large Shock("N" to
"D" Position)". ON vehicle 1. Engine idle speed
EC-17
2. Engine speed signalTM-51
3. Accelerator pedal position sensorTM-69
4. Control cable adjustmentTM-194
5. ATF temperature sensor TM-71
6. Front brake solenoid valveTM-82
7. CAN communication line LAN-4
8. Fluid level and stateTM-178
9. Line pressure testTM-187
10. Control valve with TCMTM-201
OFF vehicle11. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
TM-8, TM-9 . TM-232
2 Shock is too large
when changing D1→
D
2. ON vehicle1. Accelerator pedal position sensor
TM-69
2. Control cable adjustmentTM-194
3. Direct clutch solenoid valve TM-84
4. CAN communication line LAN-4
5. Engine speed signalTM-51
6. Input speed sensorTM-46
7. Output speed sensor and vehicle speed sensor TM-48,
TM-74
8. Fluid level and state TM-178
9. Control valve with TCMTM-201
OFF vehicle 10. Direct clutch TM-266
3Shock is too large
when changing D2→
D
3. ON vehicle1. Accelerator pedal position sensor
TM-69
2. Control cable adjustmentTM-194
3. High and low reverse clutch solenoid valve TM-86
4. CAN communication line LAN-4
5. Engine speed signalTM-51
6. Input speed sensorTM-46
7. Output speed sensor and vehicle speed sensor TM-48,
TM-74
8. Fluid level and state TM-178
9. Control valve with TCMTM-201
OFF vehicle 10. High and low reverse clutch TM-264
Revision: March 2010 2008 QX56

SYSTEM SYMPTOMTM-153
< SYMPTOM DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
4
Shift
Shock Shock is too large
when changing D3→
D
4. ON vehicle1. Accelerator pedal position sensor
TM-69
2. Control cable adjustmentTM-194
3. Input clutch solenoid valve TM-80
4. CAN communication line LAN-4
5. Engine speed signalTM-51
6. Input speed sensorTM-46
7. Output speed sensor and vehicle speed sensor TM-48,
TM-74
8. Fluid level and state TM-178
9. Control valve with TCMTM-201
OFF vehicle 10. Input clutch TM-254
5Shock is too large
when changing D4→
D
5. ON vehicle1. Accelerator pedal position sensor
TM-69
2. Control cable adjustmentTM-194
3. Front brake solenoid valve TM-82
4. CAN communication line LAN-4
5. Engine speed signalTM-51
6. Input speed sensorTM-46
7. Output speed sensor and vehicle speed sensor TM-48,
TM-74
8. Fluid level and state TM-178
9. Control valve with TCMTM-201
OFF vehicle10. Front brake (brake band)
TM-22011. Input clutchTM-254
6Shock is too large for
downshift when accel-
erator pedal is
pressed. ON vehicle1. Accelerator pedal position sensor
TM-69
2. Control cable adjustmentTM-194
3. CAN communication line LAN-4
4. Engine speed signalTM-51
5. Input speed sensorTM-46
6. Output speed sensor and vehicle speed sensor TM-48,
TM-74
7. Fluid level and state TM-178
8. Control valve with TCMTM-201
OFF vehicle9. Front brake (brake band)
TM-22010. Input clutchTM-254
11. High and low reverse clutchTM-264
12. Direct clutchTM-266
No. ItemsSymptom Condition Diagnostic ItemReference
page
Revision: March 2010 2008 QX56

TM-154
< SYMPTOM DIAGNOSIS >
SYSTEM SYMPTOM
7Shift
Shock Shock is too large for
upshift when accelera-
tor pedal is released.
ON vehicle1. Accelerator pedal position sensor
TM-69
2. Control cable adjustmentTM-194
3. Engine speed signal TM-51
4. CAN communication line LAN-4
5. Input speed sensorTM-46
6. Output speed sensor and vehicle speed sensor TM-48,
TM-74
7. Fluid level and state TM-178
8. Control valve with TCMTM-201
OFF vehicle9. Front brake (brake band)
TM-22010. Input clutchTM-254
11. High and low reverse clutchTM-264
12. Direct clutchTM-266
8Shock is too large for
lock-up. ON vehicle1. Accelerator pedal position sensor
TM-69
2. Control cable adjustmentTM-194
3. Engine speed signal TM-51
4. CAN communication line LAN-4
5. Input speed sensorTM-46
6. Output speed sensor and vehicle speed sensor TM-48,
TM-74
7. Torque converter clutch solenoid valve TM-63
8. Fluid level and stateTM-178
9. Control valve with TCMTM-201
OFF vehicle 10. Torque converter TM-232
9Shock is too large dur-
ing engine brake. ON vehicle
1. Accelerator pedal position sensor
TM-69
2. Control cable adjustmentTM-194
3. CAN communication line LAN-4
4. Fluid level and stateTM-178
5. Control valve with TCMTM-201
OFF vehicle6. Front brake (brake band)
TM-2207. Input clutchTM-254
8. High and low reverse clutchTM-264
9. Direct clutchTM-266
No. ItemsSymptom Condition Diagnostic ItemReference
page
Revision: March 2010 2008 QX56

SYSTEM SYMPTOMTM-155
< SYMPTOM DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
10
No Up
Shift Gear does not change
from D → D
2.
Refer to TM-130, "
A/T
Does Not Shift:
D1→D2". ON vehicle1. Fluid level and state
TM-178
2. Output speed sensor and vehicle speed sensor TM-48,
TM-74
3. Direct clutch solenoid valve TM-84
4. Line pressure testTM-187
5. CAN communication line LAN-4
6. Control valve with TCMTM-201
OFF vehicle 7. Direct clutch TM-266
11Gear does not change
from D → D3.
Refer to TM-131, "
A/T
Does Not Shift:
D2→D3". ON vehicle1. 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. Line pressure testTM-187
5. CAN communication line LAN-4
6. Control valve with TCMTM-201
OFF vehicle 7. High and low reverse clutch TM-264
12Gear does not change
from D → D
4.
Refer to TM-133, "
A/T
Does Not Shift:
D3→D4". ON vehicle1. 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. Line pressure testTM-187
6. CAN communication line LAN-4
7. Control valve with TCMTM-201
OFF vehicle 8. Input clutch TM-254
13Gear does not change
from D → D
5.
Refer to TM-135, "
A/T
Does Not Shift:
D4→D5". 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. Direct clutch solenoid valveTM-84
5. Input speed sensorTM-46
6. Line pressure testTM-187
7. CAN communication line LAN-4
8. Control valve with TCMTM-201
OFF vehicle9. Front brake (brake band)
TM-22010. Input clutchTM-254
No. ItemsSymptom Condition Diagnostic ItemReference
page
Revision: March 2010 2008 QX56