Toyota Tacoma manuals

Toyota Corolla Repair Manual: System description

The ecm uses the signals from the throttle position sensor, airflow meter and crankshaft position sensor to monitor the engagement condition of the lockup clutch.

Then the ecm compares the engagement condition of the lockup clutch with the lockup schedule in the ecm memory to detect mechanical trouble of the shift solenoid valve sl, valve body and torque converter clutch or automatic transaxle (clutch, brake or gear etc.).

Monitor description

Monitor description

Based on the signals from the throttle position sensor, the airflow meter and the crankshaft position sensor, the ecm sends a signal to the shift solenoid valve sl to regulate the hydraulic pressure and provide smoother gearshifts. The shiftsolenoid valve sl responds to commands from the ecm. The valve controls the lockup relay valve to perform torqueconverter lockup and flexible lockup functions.

The ecm compares the engine rpm (ne) signal and the input speed calculated by output speed sensor (output speed) and gear ratio to detect torque converter lockup. The ecm then compares the lockup status against the lockup schedule in the ecm memory. If the ecm does not detect lockup at the appropriate time, it will conclude that there is a malfunction of shift solenoid sl. The ecm will illuminate the mil.

Monitor strategy

Typical enabling condition

Typical enabling condition

Typical malfunction thresholds

Typical malfunction thresholds

Inspection procedure

Torque converter clutch solenoid performance (shift solenoid valve sl)
Dtc p0741 torque converter clutch solenoid performance (shift solenoid valve sl) ...

Inspection procedure
1 Inspect shift solenoid valve(sl) Remove the shift solenoid valve sl.  measure the resistance according to the value(s) in the table below. Standard: Connect the positive (+ ...

Other materials:

Towing with a wheel-lift type truck
► From the front Release the parking brake. ► From the rear Use a towing dolly under the front wheels. Vehicles without a smart key system: When not using a towing dolly, turn the engine switch to the ACC position and shift the shift lever to N. Vehicles with a smart key sys ...

Circuit description
The purpose of this circuit is to prevent the engine from stalling while driving in lockup condition, when brakes are suddenly applied. When the brake pedal is depressed, this switch sends a signals to the ecm. Then the ecm cancels the operation of the lockup clutch while braking is in pr ...

Power outlet
Please use as a power supply for electronic goods that use less than 12 VDC/10 A (power consumption of 120 W). Open the lid. ■The power outlet can be used when ► Vehicles without a smart key system The engine switch is in the ACC or ON position. ► Vehicles with a smart ...

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