Infiniti QX56 (Z62). Manual — part 1305
P0744 TORQUE CONVERTER
TM-129
< DTC/CIRCUIT DIAGNOSIS >
[7AT: RE7R01B]
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P0744 TORQUE CONVERTER
Description
INFOID: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 malfunction such as control valve sticking, improper solenoid
valve operation, etc.
DTC Logic
INFOID:0000000006226839
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
Always drive vehicle at a safe speed.
1.
PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” is previously conducted, 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 help maintain the driving conditions required for this
test.
4.
Perform “Self Diagnostic Results” in “TRANSMISSION”.
With GST
Follow the procedure “With CONSULT-III”.
Is “P0744” detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006226840
1.
DETECT MALFUNCTIONING ITEM
Disassemble the A/T assembly to check component parts. Refer to
.
NOTE:
Check the component parts, referring to “Possible cause” in “DTC DETECTION LOGIC”. Refer to
.
Is the inspection result normal?
YES
>> Replace the control valve & TCM. Refer to
.
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
TM-130
< DTC/CIRCUIT DIAGNOSIS >
[7AT: RE7R01B]
P0744 TORQUE CONVERTER
NO
>> Repair or replace damaged parts.
P0745 PRESSURE CONTROL SOLENOID A
TM-131
< DTC/CIRCUIT DIAGNOSIS >
[7AT: RE7R01B]
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P0745 PRESSURE CONTROL SOLENOID A
DTC Logic
INFOID:0000000006226841
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” is previously conducted, 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.
Wait for 5 seconds or more at idle speed in “N” position.
3.
Perform “Self Diagnostic Results” in “TRANSMISSION”.
With GST
Follow the procedure “With CONSULT-III”.
Is “P0745” detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006226842
1.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace the control valve & TCM. Refer to
.
NO
>> Repair or replace damaged parts.
DTC
Trouble diagnosis name
DTC is detected if...
Possible cause
P0745
Pressure Control Solenoid A
The line pressure solenoid
valve monitor value is 0.4 A or
less when the line pressure so-
lenoid valve command value is
more than 0.75 A.
• Harness or connectors
(Solenoid valve circuit is
open or shorted.)
• Line pressure solenoid valve
TM-132
< DTC/CIRCUIT DIAGNOSIS >
[7AT: RE7R01B]
P0750 SHIFT SOLENOID A
P0750 SHIFT SOLENOID A
DTC Logic
INFOID:0000000006226843
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
Always drive vehicle at a safe speed.
1.
PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” is previously conducted, 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 “BATTERY VOLT”, “MANU MODE SW”, “GEAR” and “VHCL/S SE-A/T” in “Data Monitor” in
“TRANSMISSION”.
3.
Drive vehicle and maintain the following conditions for 5 seconds or more.
4.
Perform “Self Diagnostic Results” in “TRANSMISSION”.
With GST
Follow the procedure “With CONSULT-III”.
Is “P0750” detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006226844
1.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
Is the inspection result normal?
YES
>> Replace the control valve & TCM. Refer to
.
NO
>> Repair or replace damaged parts.
DTC
Trouble diagnosis name
DTC is detected if...
Possible cause
P0750
Shift Solenoid A
• The anti-interlock solenoid
valve monitor value is ON
when the anti-interlock sole-
noid valve command value is
OFF.
• The anti-interlock solenoid
valve monitor value is OFF
when the anti-interlock sole-
noid valve command value is
ON.
• Harness or connectors
(Solenoid valve circuit is
open or shorted.)
• Anti-interlock solenoid valve
BATTERY VOLT
: 9 V or more
MANU MODE SW
: ON
GEAR
: 1st
VHCL/S SE-A/T
: 10 km/h (7 MPH) or more
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