Nissan Frontier D40. Instruction — part 1071
TM-182
< COMPONENT DIAGNOSIS >
[5AT: RE5R05A]
P0740 TORQUE CONVERTER
P0740 TORQUE CONVERTER
Description
INFOID:0000000005274063
• The torque converter clutch solenoid valve is activated, with the gear in D
4
, D
5
by the TCM in response to
signals sent from the output speed sensor and accelerator pedal position sensor (throttle position sensor).
Torque converter clutch piston operation will then be controlled.
• Lock-up operation, however, is prohibited when A/T fluid temperature is too low.
• When the accelerator pedal is depressed (less than 1/8) in lock-up condition, the engine speed should not
change abruptly. If there is a big jump in engine speed, there is no lock-up.
CONSULT-III Reference Value in Data Monitor Mode
INFOID:0000000005274064
On Board Diagnosis Logic
INFOID:0000000005274065
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0740” with CONSULT-III or 3rd judgment flicker without CONSULT-III 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:0000000005274066
• Torque converter clutch solenoid valve
• Harness or connectors
(The solenoid circuit is open or shorted.)
DTC Confirmation Procedure
INFOID:0000000005274067
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.
Turn ignition switch “ON”. (Do not start engine.)
2.
Select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
3.
Start engine and maintain the following conditions for at least 5 consecutive seconds.
VHCL/S SE-A/T: 80 km/h (50 MPH) or more
ACCELE POSI: 0.5/8 - 1.0/8
SLCT LVR POSI: “D” position
Driving location: 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-III”.
Diagnosis Procedure
INFOID:0000000005274068
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.
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
P0740 TORQUE CONVERTER
TM-183
< COMPONENT DIAGNOSIS >
[5AT: RE5R05A]
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
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.
• 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-280, "Removal and Installation"
NG
>> Repair or replace damaged parts.
4.
CHECK DTC
Perform “DTC Confirmation Procedure”.
• Refer to
TM-182, "DTC Confirmation Procedure"
.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 2.
TM-184
< COMPONENT DIAGNOSIS >
[5AT: RE5R05A]
P0744 TORQUE CONVERTER
P0744 TORQUE CONVERTER
Description
INFOID:0000000005274069
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:0000000005274070
On Board Diagnosis Logic
INFOID:0000000005274071
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0744” with CONSULT-III or 3rd judgment flicker without 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:0000000005274072
• Harness or connectors
(The solenoid circuit is open or shorted.)
• Torque converter clutch solenoid valve
• Hydraulic control circuit
DTC Confirmation Procedure
INFOID:0000000005274073
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.
2.
Select “DATA MONITOR" mode for "TRANSMISSION" with CONSULT-III.
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-III”.
Diagnosis Procedure
INFOID:0000000005274074
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.
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
P0744 TORQUE CONVERTER
TM-185
< COMPONENT DIAGNOSIS >
[5AT: RE5R05A]
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
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.
• 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-280, "Removal and Installation"
NG
>> Repair or replace damaged parts.
4.
CHECK DTC
Perform “DTC Confirmation Procedure”.
• Refer to
TM-184, "DTC Confirmation Procedure"
.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 2.
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