2008 INFINITI QX56 engine

TM-148
< SYMPTOM DIAGNOSIS >
SYSTEM SYMPTOM
Without CONSULT-III
1. Turn ignition switch “ON”.(Do not start engine)
2. Check voltage between A/T shift selector harness connector ter-
minal and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3.CHECK A/T FLUID LEVEL
Check the 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 CONTROL CABLE
Check the control cable.
• Refer to TM-194, "
Checking of A/T Position".
OK or NG
OK >> GO TO 5.
NG >> Adjust control cable. Refer to TM-194, "
Adjustment of A/
T Position".
5.CHECK A/T FLUID CONDITION
1. Remove oil pan. Refer to TM-199, "
Oil Pan".
Monitor itemConditionDisplay value
1 POSITION SW When setting the selector
lever to "1" position.
ON
When setting selector le-
ver to other positions. OFF
Item Connector No. Terminal No. Condition Data
(Approx.)
1st position switch M203 7 - Ground When setting
the selector le-
ver to "1" posi-
tion.
0V
When setting
selector lever
to other posi-
tions. Battery voltage
AWDIA0811ZZ
SAT638A
LCIA0345E
Revision: March 2010
2008 QX56

SYSTEM SYMPTOMTM-149
< 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 6.
NG >> GO TO 9.
6.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.17).
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.
7.CHECK SYMPTOM
Check again. Refer to TM-192, "
Cruise Test - Part 2"
OK or NG
OK >>INSPECTION END
NG >> GO TO 8.
8.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.
9.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.17).
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.
Vehicle Does Not Decelerate By Engine BrakeINFOID:0000000001604199
SYMPTOM:
No engine brake is applied when the gear is shifted from the 22 to 11.
DIAGNOSTIC PROCEDURE
1.CHECK SELF-DIAGNOSIS RESULTS
Perform self-diagnosis.
Do the self-diagnosis results i ndicate transmission range switch?
YES >> Check the malfunctioning system. Refer to TM-43, "Diagnosis Procedure".
NO >> GO TO 2.
2.CHECK 1ST POSITION SWITCH CIRCUIT
With CONSULT-III
1. Turn ignition switch “ON”.
2. Select "ECU INPUT SIGNALS" in "DATA MONITO R" mode for "TRANSMISSION" with CONSULT-III.
3. Read out "1 POSITION SW" moving switch selector lever to each position.
SCIA5199E
Revision: March 2010 2008 QX56

TM-150
< SYMPTOM DIAGNOSIS >
SYSTEM SYMPTOM
Without CONSULT-III
1. Turn ignition switch “ON”.(Do not start engine)
2. Check voltage between A/T shift selector harness connector ter-
minal and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3.CHECK A/T FLUID LEVEL
Check the 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 CONTROL CABLE
Check the control cable.
• Refer to TM-194, "
Checking of A/T Position".
OK or NG
OK >> GO TO 5.
NG >> Adjust control cable. Refer to TM-194, "
Adjustment of A/
T Position".
5.CHECK A/T FLUID CONDITION
1. Remove oil pan. Refer to TM-199, "
Oil Pan".
Monitor itemConditionDisplay value
1 POSITION SW When setting the selector
lever to "1" position.
ON
When setting selector le-
ver to other positions. OFF
Item Connector No. Terminal No. Condition Data
(Approx.)
1st position switch M203 7 - Ground When setting
the selector le-
ver to "1" posi-
tion.
0V
When setting
selector lever
to other posi-
tions. Battery voltage
AWDIA0811ZZ
SAT638A
LCIA0345E
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-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

TM-160
< SYMPTOM DIAGNOSIS >
SYSTEM SYMPTOM
25Slips/Will
Not en-
gage Does not hold lock-up
condition.
Refer to TM-139, "A/T
Does Not Hold Lock-
up Condition".
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
26Lock-up is not re-
leased.
Refer to TM-140,
"Lock-up Is Not Re-
leased".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
27No shock at all or the
clutch slips when vehi-
cle changes speed D1
→ D2. 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. 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