Nissan Titan. Instruction — part 598
P0744 TORQUE CONVERTER
TM-75
< DTC/CIRCUIT DIAGNOSIS >
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P0744 TORQUE CONVERTER
Description
INFOID:0000000009885779
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 Reference Value in Data Monitor Mode
INFOID:0000000009885780
On Board Diagnosis Logic
INFOID:0000000009885781
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0744” with CONSULT or 3rd judgment flicker without CONSULT 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:0000000009885782
• Harness or connectors
(The solenoid circuit is open or shorted.)
• Torque converter clutch solenoid valve
• Hydraulic control circuit
DTC Confirmation Procedure
INFOID:0000000009885783
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
1. Start engine.
2. Select “DATA MONITOR" mode for "TRANSMISSION" with CONSULT.
3. Drive vehicle and maintain the following conditions for at least 30 consecutive seconds.
ACCELE POSI: More than 1.0/8
SLCT LVR POSI: “D” position
TCC SOLENOID: 0.4 - 0.6 A
VEHICLE SPEED: 80 km/h (50 MPH) or more
Driving locations: Driving the vehicle uphill (increased engine load) will help maintain the driving
conditions required for this test.
4. If DTC is detected, go to
WITH GST
Follow the procedure “With CONSULT”.
Diagnosis Procedure
INFOID:0000000009885784
1.
CHECK INPUT SIGNAL
With CONSULT
1. Turn ignition switch “ON”.
2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for “TRANSMISSION” with CONSULT.
3. Start the engine.
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
TM-76
< DTC/CIRCUIT DIAGNOSIS >
P0744 TORQUE CONVERTER
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-201, "Control Valve with TCM"
NG
>> Repair or replace damaged parts.
4.
CHECK DTC
Perform “DTC Confirmation Procedure”.
• Refer to
TM-75, "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
P0745 PRESSURE CONTROL SOLENOID A
TM-77
< DTC/CIRCUIT DIAGNOSIS >
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P0745 PRESSURE CONTROL SOLENOID A
Description
INFOID:0000000009885785
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.
CONSULT Reference Value in Data Monitor Mode
INFOID:0000000009885786
On Board Diagnosis Logic
INFOID:0000000009885787
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0745” with CONSULT or 4th judgment flicker without CONSULT is detected under
the following conditions.
- 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:0000000009885788
• Harness or connectors
(The solenoid circuit is open or shorted.)
• Line pressure solenoid valve
DTC Confirmation Procedure
INFOID:0000000009885789
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
1. Turn ignition switch “ON” and select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT.
2. Engine start and wait at least 5 second.
3. If DTC is detected, go to
WITH GST
Follow the procedure “With CONSULT”.
Diagnosis Procedure
INFOID:0000000009885790
1.
CHECK INPUT SIGNAL
With CONSULT
1. Turn ignition switch “ON”.
2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for “TRANSMISSION” with CONSULT.
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.
2.
CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to
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
TM-78
< DTC/CIRCUIT DIAGNOSIS >
P0745 PRESSURE CONTROL SOLENOID A
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-201, "Control Valve with TCM"
NG
>> Repair or replace damaged parts.
4.
CHECK DTC
Perform “DTC Confirmation Procedure”.
• Refer to
TM-77, "DTC Confirmation Procedure"
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 2.
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