P1744

P1744-TORQUE CONVERTER LOCK-UP CLUTCH HEAT CONTROL

Theory of Operation

The Transmission Control Module (TCM) monitors the Torque Convertor Clutch for temperature during normal operation. To protect the CV Transmission from a hot temperature condition, the TCM monitors the continuation time of stall speed condition. If the monitored time is more than a predetermined value, this DTC will set causing the TCM to change the allowable engine output torque and illuminating the Over Temperature lamp.

- When Monitored:
Ignition on, engine running with the transmission in a valid forward or reverse gear.

No inhibitor switch, secondary speed sensor, or engine speed DTCs present.

- Set Condition:
The DTC will set if an Engine stall speed condition is detected for the period of 18 seconds.





Always perform the CVT Pre-Diagnostic Troubleshooting procedure before proceeding. Testing and Inspection.
CHECK CUSTOMER DRIVING HABITS
1. Check with the customer about how the vehicle is driven. Below are some conditions that can cause this DTC to set.
2. Driving a steep upward slope with low vehicle speed.
3. Accelerator pedal and brake pedal pressed simultaneously.
4. Accelerator pedal pressed under drive train locked condition (Off-Road)

View repair

Repair

- As noted in the Theory Of Operation, this DTC is designed to protect the transmission from overheating. Explain to the customer that certain driving habits will cause this DTC to set. Continued overheating may cause Transmission failure.
- Perform the CVT TRANSMISSION VERIFICATION TEST. CVT Transmission Verification Test.