Nissan Sentra Service Manual: P0740 Torque converter
DTC Logic
DTC DETECTION LOGIC
| DTC | CONSULT screen terms (Trouble diagnosis content) | DTC detection condition | Possible causes |
| P0740 | TORQUE CONVERTER (Torque Converter Clutch Circuit/ Open) | The TCM torque converter clutch solenoid
valve current monitor reading is 200 mA or
less continuously for 5 seconds or more under
the following diagnosis conditions: Diagnosis conditions
|
|
DTC CONFIRMATION PROCEDURE
CAUTION:
Be careful of the driving speed.
1.PREPARATION BEFORE OPERATION (PART 1)
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.PREPARATION BEFORE OPERATION (PART 2)
With CONSULT
- Start the engine.
- Select “Data Monitor” in “TRANSMISSION”.
- Select “FLUID TEMP”.
- Confirm that the CVT fluid temperature is in the following range.
FLUID TEMP : 10В°C (50В°F) or more
With GST
- Start the engine.
- Set the CVT fluid to 10В°C (50В°F) or more.
NOTE:
When the ambient temperature is 20В°C (68В°F), the CVT fluid usually increases to 50 to 80В°C (122 to 176В°F) with driving in an urban area for approximately 10 minutes.
Is the CVT fluid 10В°C (50В°F) or more? YES >> GO TO 3.
NO >> 1. Warm the transaxle.
2. GO TO 3.
3.CHECK DTC DETECTION
- Drive the vehicle.
- Maintain the following conditions for 10 seconds or more.
Selector lever : “D” position
Vehicle speed : 40 km/h (25 MPH) or more
- Stop the vehicle.
- Check the first trip DTC.
Is “P0740” detected? YES >> Go to TM-185, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure
1.CHECK CIRCUIT BETWEEN TCM AND CVT UNIT
- Turn ignition switch OFF.
- Disconnect TCM connector and CVT unit connector.
- Check continuity between TCM harness connector terminal and CVT unit harness connector terminal.
Is the check result
normal?
YES >> GO TO 2.
NO >> Repair or replace malfunctioning parts.
2.CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE
Check torque converter clutch solenoid valve. Refer to TM-185, "Component Inspection".
Is the check result normal? YES >> Check intermittent incident. Refer to GI-39, "Intermittent Incident".
NO >> Repair or replace malfunctioning parts.
Component Inspection
1.CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE
Check resistance between CVT unit connector terminal and ground.
Is the inspection
result normal?
YES >> INSPECTION END
NO >> There is a malfunction of torque converter clutch solenoid valve. Replace transaxle assembly.
Refer to TM-283, "Removal and Installation".
P0720 Output speed sensor
DTC Logic
DTC DETECTION LOGIC
DTC
CONSULT screen terms
(Trouble diagnosis content)
DTC detection condition
Possible causes
P0720
OUTPUT SPEED SENSOR
(Output Speed ...
P0743 Torque converter
DTC Logic
DTC DETECTION LOGIC
DTC
CONSULT screen terms
(Trouble diagnosis content)
DTC detection condition
Possible causes
P0743
TORQUE CONVERTER
(Torque Converter ...
Other materials:
The ambient temperature display is incorrect
Description
The displayed outside air temperature is higher than the actual
temperature.
The displayed outside air temperature is lower than the actual
temperature.
Outside air temperature is not indicated.
Diagnosis procedure
1.Check ambient sensor signal circuit
Check the ambie ...
P0452 EVAP Control system pressure sensor
DTC Logic
DTC DETECTION LOGIC
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P0452
EVAP SYS PRES SEN
(Evaporative emission system
pressure sensor/switch low)
An excessively low voltage from the
sensor is se ...
General Precaution
WARNING:
When replacing fuel line parts, be sure to observe the following.
Put a “CAUTION: FLAMMABLE” sign in the work area.
Be sure to work in a well ventilated area and have a CO2 fire
extinguisher.
Do not smoke while working on the fuel system. Keep open flames
and sparks ...
