P0741

DIAGNOSTIC TROUBLE CODE (DTC) P0741 TORQUE CONVERTER CLUTCH CIRCUIT STUCK OFF





Circuit Description
The Torque Converter Clutch Solenoid Valve (TCC Sol. Valve) is a Pulse Width Modulated (PWM) solenoid. The Powertrain Control Module (PCM) energizes the TCC Sol. Valve by grounding circuit 502. When vehicle operating conditions are appropriate to apply the Torque Converter Clutch (TCC), the PCM begins the TCC Sol. Valve duty cycle at 68%. The PCM then ramps the duty cycle up to 93% to achieve full TCC apply pressure.
When the TCC Sol. Valve is de-energized, the solenoid blocks filtered 2-3 drive fluid and allows TCC signal fluid to exhaust. When energized, the solenoid modulates fluid into the TCC signal fluid circuit. When fully energized, modulation stops and the solenoid blocks both 2-3 drive fluid and TCC signal fluid from being exhausted.
When the PCM detects a high TCC slip speed when the TCC is commanded on, then Diagnostic Trouble Code (DTC) P0741 sets.
DTC P0741 also detects a TCC PWM solenoid which is stuck off.

Conditions For Setting The DTC
- No Throttle Position (TP) DTC P1791.
- No Automatic Transmission Fluid Pressure Manual Valve Position Switch (TFP Val. Position Sw.) DTC P1810.
- No Vehicle Speed Sensor (VSS) DTCs P0722 or P0723.
- No TCC stuck on DTC P0742.
- No TCC release switch DTC P1887.
- No TP Sensor DTCs P0121, P0122, or P0123.
- No Pressure Switch Assembly (PSA) DTC (P1810).
- Transmission is in 2, 3, or 4.
- Time since last manual gear select lever change is greater than three seconds.
- PCM commands TCC ON for three seconds.
- TP is greater than 12%.
- Transmission Fluid Temperature (TFT) is between 20°C and 120°C (68°F and 248°F).
- Commanded gear is greater than 1st gear.
- TCC slip speed is 250 rpm or greater for five seconds.

Action Taken When The DTC Sets
- The PCM will illuminate the Malfunction Indicator Lamp (MIL) after two consecutive trips with a failure reported.
- DTC P0741 will be stored in PCM memory.
- PCM inhibits TCC engagement.
- Freeze shift adapts from being updated.

Conditions For Clearing The DTC
- The PCM will turn the MIL off after DTC P0741 passes condition test. This DTC passes when all conditions for setting the DTC, (except TCC slip is less than 50 rpm for three seconds) are met for three consecutive ignition cycles.
- History DTCs can be cleared by using a Scan Tool.

Diagnostic Aids
- Inspect the wiring for poor electrical connections at the PCM and at the transmission 20-way connector. Look for possible bent, backed out, deformed or damaged terminals. Check for weak terminal tension as well. Also check for chafed wire that could short to bare metal or other wiring. Inspect for broken wire inside the insulation.
- If diagnosing for a possible intermittent short or open condition, move or massage the wiring harness while observing test equipment for a change.

Test Description
The numbers below refer to the step numbers on the diagnostic chart.
2. This test looks for other DTCs that would set when the feed circuit is open.
7. This tests the PCM ability to command the TCC Sol. Valve ON and OFF.
9. This tests for proper transmission component/circuit resistance.











DTC P0741 - Torque Converter Clutch Circuit Stuck Off