Nissan Sentra Service Manual: P0744 Torque converter
DTC Logic
DTC DETECTION LOGIC
| DTC | CONSULT screen terms (Trouble diagnosis content) | DTC detection condition | Possible causes |
| P0744 | TORQUE CONVERTER (Torque converter clutch circuit intermittent) | The torque converter slip speed is at or above
a set value (40 rpm + (Vehicle speed / 2) continuously
for 30 seconds or more under the following
diagnosis conditions: Diagnosis conditions
|
|
DTC CONFIRMATION PROCEDURE
CAUTION:
Be careful of the driving speed.
1.PREPARATION BEFORE OPERATION 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 2
With CONSULT
- Start the engine.
- Select “Data Monitor” in “TRANSMISSION”.
- Select “FLUID TEMP”.
- Confirm that the CVT fluid temperature is in the range below.
FLUID TEMP : 20В°C (68В°F) or more
With GST
- Start the engine.
- Set the CVT fluid to 20В°C (68В°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 20В°C (68В°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 40 seconds or more.
Selector lever : “D” position
Accelerator pedal position : 1.0/8 or more
Vehicle speed : 40 km/h (25 MPH) or more
- Stop the vehicle
- Check the first trip DTC.
Is “P0744” detected? YES >> Go to TM-189, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure
1.CHECK LINE PRESSURE
Perform line pressure test. Refer to TM-149, "Work Procedure".
Is the inspection result normal? YES >> GO TO 2.
NO >> Repair or replace the malfunction items.
2.CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE
- Turn ignition switch OFF.
- Disconnect CVT unit connector.
- Check torque converter clutch solenoid valve. Refer to TM-189, "Component Inspection".
Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-39, "Intermittent Incident".
NO >> Repair or replace the malfunction items.
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".
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 ...
P0746 Pressure control solenoid A
DTC Logic
DTC DETECTION LOGIC
DTC
CONSULT screen terms
(Trouble diagnosis content)
DTC detection condition
Possible causes
P0746
PRESSURE CONTROL SOLENOID
A
(Pre ...
Other materials:
Basic inspection
Diagnosis and repair work flow
Work Flow
Overall sequence
Detailed flow
1. Get information for symptom
Get the detailed information from the customer about the symptom (the
condition and the environment when
the incident/malfunction occurred).
>> Go to 2.
2. Check dtc
Check ...
P1652 Starter motor system comm
Description
ECM controls ON/OFF state of the starter relay, according to the engine and
vehicle condition. ECM transmits
a control signal to IPDM E/R via BCM by CAN communication.
Under normal conditions, ECM controls and maintains the starter relay in OFF
state during following condition:
...
Cooling fan control
SYSTEM DIAGRAM
SYSTEM DESCRIPTION
ECM controls cooling fan speed corresponding to vehicle speed, engine coolant
temperature, refrigerant pressure,
air conditioner ON signal. Then control system has 3-step control
[HIGH/LOW/OFF].
Cooling Fan Operation
Cooling Fan Relay Operation
Whe ...