The torque converter clutch (TCC) solenoid is used to control the rate of TCC apply and release. This solenoid is a pressure controlling solenoid that is controlled by the transmission control module (TCM). The TCM varies the amount of electrical current to the TCC solenoid by changing the solenoid duty cycle. Varying the solenoid's duty cycle modulates the amount of fluid pressure supplied to the converter clutch regulator valve. The regulator valve then modifies the TCC fluid pressure. The TCC will apply or release with the change in TCC fluid pressure. The TCM compares the transmission input speed with the transmission turbine speed to determine converter slip speed; transmission input speed minus transmission turbine speed.

P0741

P0742

P0741

This DTC sets when the TCC is commanded on and the converter slip is greater than 80 RPM for 15 seconds. This must occur 2 consecutive times.

P0742 Condition 1 High Torque Condition

This DTC will set when the TCC is commanded off and the throttle is greater than 70 percent and net engine torque is greater than 275 N·m and the expected converter slip is not observed for 2 seconds.

P0742 Condition 2 High Acceleration Condition

This DTC will set when the TCC is commanded off and the output shaft acceleration is greater than 100 RPM/second and the expected converter slip is not observed for 5 seconds.

P0742 Condition 3 Accel/Decel/Accel Condition

This DTC will set when the TCC is commanded off when an output acceleration event is followed by an output deceleration event and followed by another output acceleration and the expected converter slip is not observed. An output acceleration event occurs when output shaft acceleration is greater than 40 RPM/second for greater than 4 seconds. An output deceleration event occurs when output shaft acceleration is -40 RPM/second for greater than 2.5 seconds.

P0741

P0742

DTCs P0741 and P0742 are Type B DTCs.

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Inspect the transmission fluid level. Refer to Transmission Fluid Check.
2. Perform a road test. Refer to Road Test.
3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed on the Freeze Frame/Failure Records data.

Note: You must perform the Circuit/System Verification first.

Warning: Chock the wheels to prevent the vehicle from moving. Failure to chock the wheels can cause personal injury when the electrical system is repaired.

1. Perform a line pressure test. Refer to Line Pressure Check.

⇒	If line pressure is low in all ranges, refer to Low Main Line Pressure in All Ranges.

⇒	If line pressure is low in a specific range or ranges, refer to Low Main Line Pressure in Specific Ranges, Normal Pressure in Other Ranges.

2. Engine idling, shift selector in park, record line pressure. Use the scan tool to command the TCC Control Solenoid ON and verify the TCC PC Sol. Pressure Command parameter changed from 0 kpa (0 psi) to 1600 kpa (232 psi). Record the line pressure after the pressure stabilizes. Line pressure should drop when the TCC Control Solenoid is commanded ON.

⇒

If the pressure did not drop, refer to Control Valve Body Assembly Disassemble and Control Valve Body Cleaning and Inspection. If valve body inspection is normal, replace the TCC Solenoid. Refer to Control Valve Solenoid Replacement. If line pressure still does not drop, refer to Transmission Fluid Pump Cover Disassemble.

3. If the above tested normal, replace the torque converter. Refer to Torque Converter Replacement.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

If another DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle and perform the appropriate diagnostic procedure.