Nissan Versa Sedan. Manual — part 819
TM-182
< DTC/CIRCUIT DIAGNOSIS >
[4AT: RE4F03C]
P0743 TORQUE CONVERTER
P0743 TORQUE CONVERTER
DTC Logic
INFOID:0000000009267948
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
Be careful of the driving speed.
1.
PREPARATION BEFORE WORK
If another “DTC CONFIRMATION PROCEDURE” occurs just before, turn ignition switch OFF and wait for at
least 10 seconds, then perform the next test.
>> GO TO 2.
2.
CHECK DTC DETECTION
1. Drive the vehicle.
2. Maintain the following conditions for 5 seconds or more.
3. Stop the vehicle.
4. Check the first trip DTC.
Is “P0743” detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009267949
1.
CHECK CIRCUIT BETWEEN TCM AND A/T UNIT
1. Turn ignition switch OFF.
2. Disconnect the TCM connector and A/T unit connector.
3. Check the continuity between TCM harness connector and ground.
Is the check result normal?
YES
>> GO TO 2.
DTC
Trouble diagnosis name
DTC detection condition
Possible causes
P0743
Torque Converter Clutch Circuit
Electrical
The following diagnosis condi-
tions are met, and the TCM
torque converter clutch sole-
noid valve current monitor read-
ing is 200 mA or less
continuously for 0.5 seconds or
more.
• Diagnosis condition
- Solenoid valve output cur-
rent: 750 mA or more
- GND short circuit diagnosis
occurs in the solenoid valve
drive circuit.
- TCM power supply voltage:
10 V < TCM power supply
voltage < 16 V
• Harness or connector
(Short circuit to ground in the
torque converter clutch sole-
noid valve circuit)
• Torque converter clutch sole-
noid valve
Selector lever
: D position
Vehicle speed
: 45 km/h (28 MPH) or more
TCM harness connector
Ground
Continuity
Connector
Terminal
F44
38
Ground
Does not exist
P0743 TORQUE CONVERTER
TM-183
< DTC/CIRCUIT DIAGNOSIS >
[4AT: RE4F03C]
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
NO
>> Repair or replace the malfunctioning parts.
2.
CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE
Check the torque converter clutch solenoid valve. Refer to
TM-183, "Component Inspection (Torque Converter
.
Is the check result normal?
YES
>> Check intermittent incident. Refer to
GI-45, "Intermittent Incident"
.
NO
>> Repair or replace the malfunctioning parts.
Component Inspection (Torque Converter Clutch Solenoid Valve)
INFOID:0000000009267950
1.
CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE
Check the resistance between the A/T unit connector terminal and ground.
Is the check result normal?
YES
>> INSPECTION END
NO
>> There is a malfunction of the torque converter clutch solenoid valve. Replace the transaxle
assembly. Refer to
TM-250, "Removal and Installation"
A/T unit connector
Ground
Condition
Resistance
Terminal
18
Ground
A/T fluid temperature: 20
°C
(68
°F)
Approx. 6.1
Ω
A/T fluid temperature: 50
°C
(122
°F)
Approx. 6.9
Ω
A/T fluid temperature: 80
°C
(176
°F)
Approx. 7.7
Ω
TM-184
< DTC/CIRCUIT DIAGNOSIS >
[4AT: RE4F03C]
P0744 TORQUE CONVERTER
P0744 TORQUE CONVERTER
Description
INFOID:0000000009267951
This DTC is detected when the torque converter clutch solenoid valve is electrically normal but the torque con-
verter clutch does not engage. This is not due to an electrical malfunction (circuit open or shorted), but is
instead due to a mechanical malfunction (sticking of the control valve, malfunction of the solenoid, etc.).
DTC Logic
INFOID:0000000009267952
DTC DETECTION LOGIC
DTC REPRODUCTION PROCEDURE
CAUTION:
Be careful of the driving speed.
1.
PREPARATION BEFORE WORK
If another “DTC CONFIRMATION PROCEDURE” occurs just before, turn ignition switch OFF and wait for at
least 10 seconds, then perform the next test.
>> GO TO 2.
2.
CHECK DTC DETECTION
1. Drive the vehicle.
2. Maintain the following conditions for 35 seconds or more.
3. Stop the vehicle.
4. Check the first trip DTC.
Is “P0744” detected?
YES
>> Go to
NO
>> Check intermittent incident. Refer to
GI-45, "Intermittent Incident"
.
Diagnosis Procedure
INFOID:0000000009267953
1.
CHECK LINE PRESSURE
Perform line pressure test. Refer to
.
Is the check result normal?
YES
>> GO TO 2.
NO
>> Repair or replace the malfunction items.
2.
CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE
1. Turn ignition switch OFF.
2. Disconnect the A/T unit connector.
3. Check the torque converter clutch solenoid valve. Refer to
TM-185, "Component Inspection (Torque Con-
verter Clutch Solenoid Valve)"
DTC
Trouble diagnosis name
DTC detection condition
Possible causes
P0744
Torque Converter Clutch Circuit
Intermittent
The following diagnosis condi-
tions are met, and the torque
converter slip speed is at or
above a set value (40 rpm + Ve-
hicle speed / 2) continuously for
30 seconds or more.
• Diagnosis condition
- Lock-up pressure difference:
More than Max. lock-up pres-
sure difference
× 0.95
• Torque converter clutch sole-
noid valve
• Control valve assembly
• Torque converter
Selector lever
: D position
Vehicle speed
: 45 km/h (28 MPH) or more
P0744 TORQUE CONVERTER
TM-185
< DTC/CIRCUIT DIAGNOSIS >
[4AT: RE4F03C]
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
Is the check result normal?
YES
>> Check intermittent incident. Refer to
GI-45, "Intermittent Incident"
.
NO
>> Repair or replace the malfunction items.
Component Inspection (Torque Converter Clutch Solenoid Valve)
INFOID:0000000009267954
1.
CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE
Check the resistance between the A/T unit connector terminal and ground.
Is the check result normal?
YES
>> INSPECTION END
NO
>> There is a malfunction of the torque converter clutch solenoid valve. Replace the transaxle
assembly. Refer to
TM-250, "Removal and Installation"
A/T unit connector
Ground
Condition
Resistance
Terminal
18
Ground
A/T fluid temperature: 20
°C
(68
°F)
Approx. 6.1
Ω
A/T fluid temperature: 50
°C
(122
°F)
Approx. 6.9
Ω
A/T fluid temperature: 80
°C
(176
°F)
Approx. 7.7
Ω
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