P0741-TORQUE CONVERTER CLUTCH CIRCUIT PERFORMANCE

For a complete wiring diagram Refer to Section 8W

Theory of Operation

The Transmission Control Module (TCM) constantly monitors the amount of torque converter slippage. When the torque converter clutch (TCC) is closed the slippage is expected to be below a predetermined threshold. If the slippage is more then expected when the TCC is closed, the DTC will set.

• When Monitored:

  Ignition on, TCM not in initialization phase, No input speed sensor 1 or 2 (N2–N3) DTCs, No CAN bus or ECM DTCs, No CAN engine speed signal or engine torque signal not implausible DTCs, Engine speed greater than 450 rpm, No shift in progress, Gear 1, 2, 3, 4 or 5 engaged, and the TCM torque converter status is OPEN

• Set Condition:

  The TCM detects TCC slippage greater than a calibrated value.

Diagnostic Test

• Refer to the Transmission category and perform the appropriate symptom.

• Repair the (T75) TCC Solenoid Control circuit for a short to another circuit(s).

NOTE: When the Transmission Control Module (TCM) detects and stores a DTC, the TCM also stores the vehicles operating conditions under which the DTC originally set. This information is located in the scan tool under Environmental Data. Before erasing any stored DTCs, record any available data to assist in duplicating the conditions in which the DTC originally set. Record the Environmental Data.

• Repair internal transmission. Pay particular attention to the components related to the TCC such as the Lockup Control valve, TCC solenoid, Valve Body, or the Torque Converter.

• Test complete