P0742

DTC P0742: Torque Converter Clutch System Malfunction (Stuck ON)

DESCRIPTIONS OF MONITOR METHODS
With TCM signal for no lock-up engagement, if vehicle speed equals or exceeds specified value, accelerator is ON, and torque converter slip amount is below specified value, TCM judges that torque converter clutch is stuck ON.

MONITOR EXECUTION
Continuous

MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
- P0335: Crankshaft position sensor malfunction
- P0715: Input shaft speed sensor malfunction
- P0720: Output shaft speed sensor malfunction
- P0741: Torque converter clutch system malfunction (Stuck OFF)
- P0743: Torque converter clutch solenoid malfunction

Sensor (The sensor below is determined to be normal)
- Input shaft speed sensor
- Output shaft speed sensor
- Crankshaft position sensor
- Torque converter clutch solenoid

LOGIC FLOW CHARTS (Monitor Sequence):

DTC SET CONDITIONS (Entry Conditions and Malfunction Thresholds)

Check Conditions
- Throttle position sensor voltage: 1.5 volts or more.
- Output speed: 1,000 r/min or more.
- Solenoid status: OFF.
- Transmission range switch position: D, 3, 2 or L.
- Time after lock up clutch release: 5 seconds or more.

Judgement Criteria
- Calculated slip (engine speed - input speed): 5 r/min or less. (10 seconds)
- Calculated slip (engine speed - input speed): -5 r/min or more. (10 seconds)

OBD-II DRIVE CYCLE PATTERN
Start the engine, and drive at 30 km/h (19 mph) for 30 seconds. Then stop the vehicle, and turn OFF the ignition switch. After that, restart the engine, and drive again at 30 km/h (19 mph) for 30 seconds.