Solenoid valve SL, for Lock-up
| Solenoid valve SL, for Lock-up |
Solenoid valve SL is located in the valve housing, which is mounted on the transmission casing. It controls the engagement of the lock-up function, so that transmission takes place mechanically through the torque converter when the solenoid is activated.
The solenoid is grounded via its casing directly to the transmission casing and is connected to control module pin 19, which activates it by energizing it with B+. An unenergized valve is open.
The power supply is controlled by the control module, which sends signals to engage or disengage lock-up with respect to speed, throttle position and the selected driving program.
Lock-up is blocked in the following situations:
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If an electrical fault occurs so that limp-home is activated.
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When the brake light switch closes and the gearbox input speed is lower than 2000 rpm.
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When the accelerator is fully released and the vehicle speed is below 125 km/h with the selector lever in position D.
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The nominal resistance of the solenoid winding is 13 ohms.
Diagnostics
A short-circuit to ground generates diagnostic trouble code P1862.An open-circuit/short-circuit to B+ generates diagnostic trouble code P1863.
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