2008 INFINITI QX56 engine

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

TM-164
< SYMPTOM DIAGNOSIS >
SYSTEM SYMPTOM
34Slips/Will
Not En-
gage When you press the
accelerator pedal and
shift speed D2→ D1
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. Direct clutch solenoid valve TM-84
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. 1st one-way clutchTM-259
11. Gear systemTM-220
12. Reverse brakeTM-232
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
35 With selector lever in
“D” position
, accelera-
tion is extremely poor. 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. Transmission range switchTM-43
6. Control cable adjustmentTM-194
7. Control valve with TCMTM-201
OFF vehicle8. Torque converter
TM-232
9. Oil pump assemblyTM-250
10. 1st one-way clutchTM-259
11. Gear systemTM-220
12. Reverse brakeTM-232
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
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

SYSTEM SYMPTOMTM-167
< SYMPTOM DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
41
Slips/Will
Not En-
gage While accelerating in
5th, 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. Front brake solenoid valveTM-82
6. Control valve with TCMTM-201
OFF vehicle7. Torque converter
TM-232
8. Oil pump assemblyTM-250
9. Front brake (brake band)TM-220
10. Input clutchTM-254
11. Gear systemTM-220
12. High and low reverse clutchTM-264
42Slips at lock-up. ON vehicle1. 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
43No creep at all.
Refer to
TM-123, "
Ve-
hicle Does Not Creep
Backward in "R" Posi-
tion", TM-125, "Veh i-
cle Does Not Creep
Forward in "D" Posi-
tion"
ON vehicle 1. Fluid level and state
TM-178
2. Line pressure testTM-187
3. Accelerator pedal position sensor TM-69
4. Direct clutch solenoid valveTM-84
5. Transmission range switchTM-43
6. CAN communication line LAN-4
7. Control cable adjustmentTM-194
8. Control valve with TCMTM-201
OFF vehicle9. Torque converter
TM-232
10. Oil pump assemblyTM-250
11. 1st one-way clutchTM-259
12. Gear systemTM-220
13. Reverse brakeTM-232
14. Direct clutchTM-266
15. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
TM-8
, TM-9
TM-232
16. 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-169
< SYMPTOM DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
48
Others Shift point is low in “D”
position.
ON vehicle1. Output speed sensor and vehicle speed sensor
TM-48
,
TM-74
2. Accelerator pedal position sensor TM-69
3. CAN communication line LAN-4
4. Control valve with TCMTM-201
49Judder occurs during
lock-up. ON vehicle1. Fluid level and state
TM-178
2. Engine speed signal TM-51
3. Input speed sensorTM-46
4. Output speed sensor and vehicle speed sensorTM-48,
TM-74
5. Accelerator pedal position sensor TM-69
6. CAN communication line LAN-4
7. Torque converter clutch solenoid valveTM-63
8. Control valve with TCMTM-201
OFF vehicle 9. Torque converter TM-232
50Strange noise in “R”
position. ON vehicle
1. Fluid level and state
TM-178
2. Engine speed signal TM-51
3. CAN communication line LAN-4
4. Control valve with TCMTM-201
OFF vehicle5. Torque converter
TM-232
6. Oil pump assemblyTM-250
7. Gear systemTM-220
8. High and low reverse clutchTM-264
9. Reverse brakeTM-232
51Strange noise in “N”
position. ON vehicle
1. Fluid level and state
TM-178
2. Engine speed signal TM-51
3. CAN communication line LAN-4
4. Control valve with TCMTM-201
OFF vehicle5. Torque converter
TM-2326. Oil pump assemblyTM-250
7. Gear systemTM-220
52Strange noise in “D”
position. ON vehicle
1. Fluid level and state
TM-178
2. Engine speed signal TM-51
3. CAN communication line LAN-4
4. Control valve with TCMTM-201
OFF vehicle5. Torque converter
TM-232
6. Oil pump assemblyTM-250
7. Gear systemTM-220
8. 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-170
< SYMPTOM DIAGNOSIS >
SYSTEM SYMPTOM
53Others Vehicle dose not de-
celerate by engine
brake.
Refer to TM-149, "Ve -
hicle Does Not Decel-
erate By Engine
Brake".
ON vehicle
1. Transmission range switch
TM-43
2. Fluid level and stateTM-178
3. Control cable adjustmentTM-194
4. 1st position switchTM-149
5. CAN communication line LAN-4
6. Control valve with TCMTM-201
OFF vehicle7. Input clutch
TM-2548. High and low reverse clutchTM-264
9. Direct clutchTM-266
54Engine brake does not
operate in “2” position. ON vehicle1. Transmission range switch
TM-43
2. Fluid level and stateTM-178
3. Control cable adjustmentTM-194
5. CAN communication line LAN-4
6. Control valve with TCMTM-201
OFF vehicle7. Front brake (brake band)
TM-2208. Input clutchTM-254
9. High and low reverse clutchTM-264
55Engine brake does not
operate in “1” position. ON vehicle1. Transmission range switch
TM-43
2. Fluid level and stateTM-178
3. Control cable adjustmentTM-194
4. 1st position switchTM-149
5. CAN communication line LAN-4
6. Control valve with TCMTM-201
OFF vehicle7. Input clutch
TM-2548. High and low reverse clutchTM-264
9. Direct clutchTM-266
No. ItemsSymptom Condition Diagnostic ItemReference
page
Revision: March 2010 2008 QX56