2019 Infiniti M35 V6-3.5L (VQ35HR) Diagnostic and Repair Information Page 591
Perform See: P Code Charts/P0740/5AT RE5R05A.
OK or NG
OK - INSPECTION END
NG - GO TO 2.
7AT RE7R01A
P0740 TORQUE CONVERTER
Description
- The torque converter clutch solenoid valve is activated, with the gear in D2, D3, D4, D5, D6, D7, M2, M3, M4, M5, M6 and M7 by the TCM
in response to signals transmitted from the vehicle 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 1.0/8) 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.
DTC Logic
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
Always drive vehicle at a safe speed.
1.PRECONDITIONING
If "DTC CONFIRMATION PROCEDURE" is previously conducted, always turn ignition switch OFF and wait at least 10 seconds before
performing the next test.
- GO TO 2.
2.CHECK DTC DETECTION
With CONSULT-III
1. Start the engine.
2. Select "MANU MODE SW", "GEAR" and "VEHICLE SPEED" in "Data Monitor" in "TRANSMISSION".
3. Drive vehicle and maintain the following conditions for 30 seconds or more.
NOTE:
Driving the vehicle uphill (increased engine load) will help maintain the driving conditions required for this test.
MANU MODE SW : ON
GEAR : 2
VEHICLE SPEED : 40 km/h (25 MPH) or more
4. Perform "Self Diagnostic Results" in "TRANSMISSION".
With GST
Follow the procedure "With CONSULT-III".
Is "P0740" detected?
YES - Go to See: P Code Charts/P0740/7AT RE7R01A.
NO - INSPECTION END
Diagnosis Procedure
1.CHECK INTERMITTENT INCIDENT
See: Testing and Inspection/Initial Inspection and Diagnostic Overview/How to Perform Efficient Diagnosis For an Electrical Incident.
Is the inspection result normal?
YES - Replace A/T assembly. See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Service and Repair/Removal and
Replacement/7AT RE7R01A/Transmission Assembly/Exploded View.
NO - Repair or replace damaged parts.
5AT RE5R05A
P0744 TORQUE CONVERTER
Description
This malfunction is detected when the A/T does not shift into 5GR position or the torque converter clutch does not lock-up as instructed by the
