Infiniti QX56 (JA60). Manual — part 941
![](/vehicles/zatt/vend/genn/oiq.png)
TM-66
< COMPONENT DIAGNOSIS >
P0740 TORQUE CONVERTER
3. Start engine.
4. Read out the value of “TCC SOLENOID” while driving.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 2.
2.
CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to
.
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace damaged parts.
3.
DETECT MALFUNCTIONING ITEM
Check the following items:
• The A/T assembly harness connector pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> Replace the control valve with TCM. Refer to
TM-172, "Control Valve with TCM and A/T Fluid
Temperature Sensor 2 and Plug"
NG
>> Repair or replace damaged parts.
4.
CHECK DTC
Perform “DTC Confirmation Procedure”.
• Refer to
TM-65, "DTC Confirmation Procedure"
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 2.
Item name
Condition
Display value (Approx.)
TCC SOLENOID
When performing slip lock-up.
0.2 - 0.4 A
When performing lock-up.
0.4 - 0.6 A
![](/vehicles/zatt/vend/genn/whita.png)
P0744 TORQUE CONVERTER
TM-67
< COMPONENT DIAGNOSIS >
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P0744 TORQUE CONVERTER
Description
INFOID:0000000005148599
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.
CONSULT-III Reference Value in Data Monitor Mode
INFOID:0000000005148600
On Board Diagnosis Logic
INFOID:0000000005148601
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0744 TORQUE CONVERTER” with CONSULT-III is detected under the following
conditions.
- When A/T cannot perform lock-up even if electrical circuit is good.
- When TCM detects as irregular by comparing difference value with slip rotation.
Possible Cause
INFOID:0000000005148602
• Harness or connectors
(The solenoid circuit is open or shorted.)
• Torque converter clutch solenoid valve
• Hydraulic control circuit
DTC Confirmation Procedure
INFOID:0000000005148603
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”
and wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-III
1. Start engine and Select “TCC S/V FNCTN CHECK” of “DTC WORK SUPPORT” mode for “TRANSMIS-
SION” with CONSULT-III and touch “START”.
2. Accelerate vehicle to more than 80 km/h (50 MPH) and maintain the following condition continuously until
“TESTING” has turned to “COMPLETE”. (It will take approximately 30 seconds after “TESTING” shows.)
ACCELE POSI: More than 1.0/8 (at all times during step 4)
TCC SOLENOID: 0.4 - 0.6 A
SLCT LVR POSI: “D” position
[Reference speed: Constant speed of more than 80 km/h (50 MPH)]
-
Make sure “GEAR” shows “5”.
-
For shift schedule, refer to
TM-266, "Vehicle Speed at Which Lock-up Occurs/Releases"
.
-
If “TESTING” does not appear on CONSULT-III for a long time, select “SELF-DIAG RESULTS”. In
case a 1st trip DTC other than P0744 is shown, refer to applicable “TROUBLE DIAGNOSIS FOR
DTC”.
3. Make sure that “OK” is displayed. (If “NG” is displayed, refer to “DIAGNOSTIC PROCEDURE”.)
.
Refer to shift schedule,
TM-266, "Vehicle Speed at Which Lock-up Occurs/Releases"
WITH GST
Follow the procedure “With CONSULT-III”.
Item name
Condition
Display value (Approx.)
TCC SOLENOID
When performing slip lock-up.
0.2 - 0.4 A
When performing lock-up.
0.4 - 0.6 A
![](/vehicles/zatt/vend/genn/pinritoreut.png)
TM-68
< COMPONENT DIAGNOSIS >
P0744 TORQUE CONVERTER
Diagnosis Procedure
INFOID:0000000005148604
1.
CHECK INPUT SIGNAL
With CONSULT-III
1. Turn ignition switch “ON”.
2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
3. Start the engine.
4. Read out the value of “TCC SOLENOID” while driving.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 2.
2.
CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to
.
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace damaged parts.
3.
DETECT MALFUNCTIONING ITEM
Check the following items:
• The A/T assembly harness connector pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> Replace the control valve with TCM. Refer to
TM-172, "Control Valve with TCM and A/T Fluid
Temperature Sensor 2 and Plug"
NG
>> Repair or replace damaged parts.
4.
CHECK DTC
Perform “DTC Confirmation Procedure”.
• Refer to
TM-67, "DTC Confirmation Procedure"
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 2.
Item name
Condition
Display value (Approx.)
TCC SOLENOID
When performing slip lock-up.
0.2 - 0.4 A
When performing lock-up.
0.4 - 0.6 A
![](/vehicles/zatt/vend/genn/thaittr.png)
P0745 PRESSURE CONTROL SOLENOID A
TM-69
< COMPONENT DIAGNOSIS >
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P0745 PRESSURE CONTROL SOLENOID A
Description
INFOID:0000000005148605
The line pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in
response to a signal sent from the TCM.
The line pressure duty cycle value is not consistent when the closed throttle position signal is “ON”.
To confirm the line pressure duty cycle at low pressure, the accelerator (throttle) should be open until
the closed throttle position signal is “OFF”.
CONSULT-III Reference Value in Data Monitor Mode
INFOID:0000000005148606
On Board Diagnosis Logic
INFOID:0000000005148607
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0745 PC SOLENOID A” with CONSULT-III is detected under the following condi-
tions.
- When TCM detects an improper voltage drop when it tries to operate the solenoid valve.
- When TCM detects as irregular by comparing target value with monitor value.
Possible Cause
INFOID:0000000005148608
• Harness or connectors
(The solenoid circuit is open or shorted.)
• Line pressure solenoid valve
DTC Confirmation Procedure
INFOID:0000000005148609
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”
and wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch “ON” and select “DATA MONITOR” mode for “ENGINE” with CONSULT-III.
2. Engine start and wait at least 5 second.
3. If DTC is detected, go to
WITH GST
Follow the procedure “With CONSULT-III”.
Diagnosis Procedure
INFOID:0000000005148610
1.
CHECK INPUT SIGNAL
With CONSULT-III
1. Turn ignition switch “ON”.
2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
3. Start the engine.
4. Read out the value of “LINE PRES SOL” while driving.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 2.
Item name
Condition
Display value (Approx.)
LINE PRES SOL
During driving
0.2 - 0.6 A
Item name
Condition
Display value (Approx.)
LINE PRES SOL
During driving
0.2 - 0.6 A
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