2011 INFINITI QX56 Factory Service Manual

dead battery trip computer power steering fluid dashboard maintenance reset spark plugs

Page 5217 of 5598

INFINITI QX56 2011 Factory Service Manual
P0744 TORQUE CONVERTERTM-129
< DTC/CIRCUIT DIAGNOSIS > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
P0744 TORQUE CONVERTER
DescriptionINFOID:0000000006226838
This malfunction is detected when the A

P0744 TORQUE CONVERTERTM-129
< DTC/CIRCUIT DIAGNOSIS > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
P0744 TORQUE CONVERTER
DescriptionINFOID:0000000006226838
This malfunction is detected when the A/T does not lock-up. This is not only caused by electrical malfunction
(circuits open or shorted) but also by mechanical malfunc tion such as control valve sticking, improper solenoid
valve operation, etc.
DTC LogicINFOID:0000000006226839
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
Always drive vehicle at a safe speed.
1.PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” is previously c onducted, always turn ignition switch OFF and wait at
least 10 seconds before performing the next test.
>> GO TO 2.
2.CHECK DTC DETECTION
With CONSULT-III
1. Start the engine.
2. Select “MANU MODE SW”, “GEAR” and “VEHICLE SPEED” in “Data Monitor” in “TRANSMISSION”.
3. Drive vehicle and maintain the following conditions for 10 seconds or more. NOTE:
Driving the vehicle uphill (increased engine load) will hel p maintain the driving conditions required for this
test.
4. Perform “Self Diagnostic Resu lts” in “TRANSMISSION”.
With GST
Follow the procedure “With CONSULT-III”.
Is
“P0744” detected?
YES >> Go to TM-129, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006226840
1.DETECT MALFUNCTIONING ITEM
Disassemble the A/T assembly to check component parts. Refer to TM-226, "
Disassembly".
NOTE:
Check the component parts, referring to “Possibl e cause” in “DTC DETECTION LOGIC”. Refer to TM-129,
"DTC Logic".
Is the inspection result normal?
YES >> Replace the control valve & TCM. Refer to TM-182, "Exploded View".
DTC Trouble diagnosis name DTC is detected if... Possible cause
P0744 Torque Converter Clutch Circuit
Intermittent The lock-up is not performed in
spite of within the lock-up area. Harness or connectors
Torque converter clutch sole-
noid valve
Torque converter
Input speed sensor 1, 2
Hydraulic control circuit
MANU MODE SW : ON
GEAR : 2nd
VEHICLE SPEED : 40 km/h (25 MPH) or more
Revision: 2010 May2011 QX56

Page 5218 of 5598

INFINITI QX56 2011 Factory Service Manual
TM-130
< DTC/CIRCUIT DIAGNOSIS >[7AT: RE7R01B]
P0744 TORQUE CONVERTER
NO >> Repair or replace damaged parts.
Revision: 2010 May2011 QX56

Page 5219 of 5598

INFINITI QX56 2011 Factory Service Manual
P0745 PRESSURE CONTROL SOLENOID ATM-131
< DTC/CIRCUIT DIAGNOSIS > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
P0745 PRESSURE CONTROL SOLENOID A
DTC LogicINFOID:0000000006226841
DTC DETECTION LOGIC

Page 5220 of 5598

INFINITI QX56 2011 Factory Service Manual
TM-132
< DTC/CIRCUIT DIAGNOSIS >[7AT: RE7R01B]
P0750 SHIFT SOLENOID A
P0750 SHIFT SOLENOID A
DTC LogicINFOID:0000000006226843
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
Always drive vehi

Page 5221 of 5598

INFINITI QX56 2011 Factory Service Manual
P0775 PRESSURE CONTROL SOLENOID BTM-133
< DTC/CIRCUIT DIAGNOSIS > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
P0775 PRESSURE CONTROL SOLENOID B
DTC LogicINFOID:0000000006226845
DTC DETECTION LOGIC

Page 5222 of 5598

INFINITI QX56 2011 Factory Service Manual
TM-134
< DTC/CIRCUIT DIAGNOSIS >[7AT: RE7R01B]
P0780 SHIFT
P0780 SHIFT
DescriptionINFOID:0000000006226847
The TCM detects the malfunction of low brake solenoid valv
e. This is not only caused by elec

TM-134
< DTC/CIRCUIT DIAGNOSIS >[7AT: RE7R01B]
P0780 SHIFT
P0780 SHIFT
DescriptionINFOID:0000000006226847
The TCM detects the malfunction of low brake solenoid valv
e. This is not only caused by electrical malfunction
(circuits open or shorted) but also by mechanical malfunc tion such as control valve sticking, improper solenoid
valve operation, etc.
DTC LogicINFOID:0000000006226848
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
“ TM-134, "
Diagnosis Procedure"” must be performed before star ting “DTC CONFIRMATION PROCE-
DURE”.
Never perform “DTC CONFIRMATION PROCEDURE” before completing the repair, which may cause secondary malfunction.
Always drive vehicle at a safe speed.
1.PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” is previously c onducted, always turn ignition switch OFF and wait at
least 10 seconds before performing the next test.
>> GO TO 2.
2.CHECK DTC DETECTION
With CONSULT-III
1. Start the engine.
2. Select “SLCT LVR POSI”, “ACCELE POSI” and “G EAR” in “Data Monitor” in “TRANSMISSION”.
3. Drive vehicle and maintain the following conditions.
4. Perform “Self Diagnostic Results” in “TRANSMISSION”.
With GST
Follow the procedure “With CONSULT-III”.
Is
“P0780” detected?
YES >> Go to TM-134, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006226849
1.DETECT MALFUNCTIONING ITEM
Disassemble the A/T assembly to check component parts. Refer to TM-226, "
Disassembly".
NOTE:
DTC Trouble diagnosis name DTC is detected if... Possible cause
P0780 Shift Error When shifting from 3GR to
4GR with the selector lever in
“D” position, the gear ratio
does not shift to 1.412 (gear
ratio of 4th).
When shifting from 5GR to 6GR or 6GR to 7GR, the en-
gine speed exceeds the pre-
scribed speed. Anti-interlock solenoid valve
Low brake solenoid valve
Hydraulic control circuit
SLCT LVR POSI : D
ACCELE POSI : More than 1.0/8
GEAR : 3rd
→ 4th
Revision: 2010 May2011 QX56

Page 5223 of 5598

INFINITI QX56 2011 Factory Service Manual
P0780 SHIFTTM-135
< DTC/CIRCUIT DIAGNOSIS > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
Check the component parts, referring to “Possibl e cause” in “DTC DETECTION LOGIC”. Refer to TM-134

Page 5224 of 5598

INFINITI QX56 2011 Factory Service Manual
TM-136
< DTC/CIRCUIT DIAGNOSIS >[7AT: RE7R01B]
P0795 PRESSURE CONTROL SOLENOID C
P0795 PRESSURE CONTROL SOLENOID C
DTC LogicINFOID:0000000006226850
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUT

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