Toyota Corolla (E120): System description
The ecm uses the signals from the throttle position sensor, air–flow meter and crankshaft position sensor to monitor the engagement condition of the lock–up clutch.
Then the ecm compares the engagement condition of the lock–up clutch with the lock–up 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
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 shift–solenoid valve sl responds to commands from the ecm. The valve controls the lock–up relay valve to perform torque–converter lock–up and flexible lock–up 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 lock–up. The ecm then compares the lock–up status against the lock–up schedule in the ecm memory. If the ecm does not detect lock–up 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 malfunction thresholds
Other materials:
On–vehicle inspection
1. Connect hand–held tester:
connect the hand–held tester to the dlc3.
start the engine and run it at idle.
select the active test mode on the hand–held tester.
Hint:
please refer to the hand–held tester operator’s manual for further details.
2. Inspect actua ...
Replacement
1. Work for preventing gasoline from spilling out
2. Remove engine under cover rh
3. Drain coolant
4. Remove front wheel rh
5. Remove cylinder head cover no.2
Remove the 2 nuts, 2 clips and cylinder head cover.
6. Remove air cleaner hose no.1
loosen the 2 air cleaner hose ...
Heater & air conditioner
Service data
Torque specification
Supplemental restraint system
Torque specification
Seat belt
Torque specification
Wiper & washer
Torque specification
Audio & visual system
Torque specification
Instrument panel/meter
Torque specification
Seat
Torque sp ...