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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:

Diagnostic trouble code chart
Hint: as for the vehicle for mexico, refer to repair manual 2003 corolla (pub. No. Rm938u). Parameters listed in the chart may not be exactly the same as your readings due to the type of instrument or other factors. If a malfunction code is displayed during the dtc check in the check mod ...

Inspection procedure
1 Inspect dlc3 terminal voltage Turn the ignition switch to on.  measure voltage between terminals 13 (tc) and 4 (cg) of dlc3. Ok: voltage: 10 16 v 2 Check harness and connector(between cruise control ecu assy and dlc3) Check for open and short circuit in harness a ...

Inspection procedure
1 Inspect ecm(+b voltage) Turn the ignition switch on.  measure the voltage between the terminals of the e4 and e6 ecm connectors. Standard: 2 Check harness and connector(ecm body ground) Disconnect the e4 ecm connector. check the resistance between the wire ha ...

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