2019 Infiniti M35 V6-3.5L (VQ35HR) Diagnostic and Repair Information Page 592
TCM. 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
On Board Diagnosis Logic
- 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
- Harness or connectors
(Solenoid circuit is open or shorted.)
- Torque converter clutch solenoid valve
- Hydraulic control circuit
DTC Confirmation Procedure
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 the engine.
2. Select "DATA MONITOR" in "TRANSMISSION".
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 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 See: P Code Charts/P0744/5AT RE5R05A.
WITH GST
Follow the procedure "WITH CONSULT-III".
Diagnosis Procedure
1.CHECK INPUT SIGNAL
With CONSULT-III
1. Turn ignition switch ON.
2. Select "DATA MONITOR" in "TRANSMISSION".
3. Start engine.
4. Read out the value of "TCC SOLENOID" while driving. See: P Code Charts/P0744/5AT RE5R05A.
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. See: Diagrams/Electrical Diagrams/Transmission Control Systems/5AT RE5R05A/Main Power
Supply and Ground Circuit.
OK or NG
OK - GO TO 3.
NG - Repair or replace damaged parts.
3.DETECT MALFUNCTIONING ITEM
Check 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. See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Valve Body/Service and Repair.
NG - Repair or replace damaged parts.
