P0741

K41B CVT: CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: P0741, P2757: Torque Converter Clutch Solenoid Performance (Shift Solenoid Valve SL)


DESCRIPTION

The ECM uses the lock-up control solenoids (SL and DSU) to perform lock-up control in response to the driving conditions.

HINT
The lock-up engagement solenoid DSU controls the lock-up clutch pressure in response to the input torque.





MONITOR DESCRIPTION

When performing lock-up control (on/off) of the torque converter, the ECM compares the rotating speeds of the turbine (NT) and engine (NE) to detect mechanical malfunctions in the lock-up control solenoids (SL and DSU). When the rotating speeds are different, the ECM detects the problem, illuminates the MIL and stores the DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

All





P0741 (ON malfunction) and P2757 (OFF malfunction):





P2757: ON malfunction:





TYPICAL MALFUNCTION THRESHOLDS

P0741 (ON malfunction) and P2757 (OFF malfunction):





P2757 (ON malfunction):





COMPONENT OPERATING RANGE

P0741 (ON malfunction) and P2757 (OFF malfunction):





P2757 (ON malfunction):





INSPECTION PROCEDURE

NOTICE:
Perform the universal trip to clear permanent DTCs Reading and Clearing Diagnostic Trouble Codes.

PROCEDURE

1. CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0741 AND P2757)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / DTC / Current or Pending.

(e) Read the DTCs using the Techstream.

Result





HINT
If any other DTCs besides P0741 or P2757 are output, perform troubleshooting for those DTCs first.

B -- GO TO DTC CHART K41B Continuously Variable Transmission/Transaxle, CVT
A -- Continue to next step.

2. CLEAR DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

NEXT -- Continue to next step.

3. PERFORM DRIVE TEST

CAUTION:
Strictly observe posted speed limits, traffic laws, and road conditions when performing the drive test.

NOTICE:
- This test must be conducted after checking and confirming that the engine is operating normally.
- Perform this test while the CVT fluid temperature is between 50 to 100°C (122 to 212°F).
- Perform the test with the A/C off.

HINT
- Lock-up control will not operate when the CVT fluid temperature is 40°C (104°F) or less and the vehicle speed is 60 km/h (37 mph) or less or when the CVT fluid temperature is 5°C (41°F) or less.
- Lock-up control will not operate when the engine coolant temperature is 30°C (86°F) or less.
- The lock-up OFF vehicle speed may vary depending on the electrical load and air conditioning and brake operations.

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Data List / SPD (NT), Lock Up and Engine Speed.

(e) Check the Data List while driving.

Result





B -- CHECK FOR INTERMITTENT PROBLEMS Electronic Circuit Inspection Procedure
A -- Continue to next step.

4. REPLACE TORQUE CONVERTER ASSEMBLY AND CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY

(a) Replace torque converter assembly and continuously variable transaxle assembly Removal.

NEXT -- Continue to next step.

5. PERFORM INITIALIZATION P0705

NEXT -- END