XC70 L5-2.5L Turbo VIN 59 B5254T2 (2003)
Line pressure solenoid, SLS
The line pressure solenoid, SLS is in the transmission control system, which is mounted on the front edge of the transmission. The line pressure
solenoid, SLS consists of an electrical coil which controls a hydraulic valve. The solenoid is controlled by pulse width modulation (PWM) voltage and
is grounded via the transmission control module (TCM). The hydraulic function of the solenoid is linear. The hydraulic valve is controlled by the
varied current which is the result of the current pulse conditions. During high pulse conditions, (at high currents (approximately 1 A)) the line pressure
is low. During low pulse conditions (at low currents) the line pressure is high. In the event of an open-circuit the line pressure reaches maximum which
causes hard shifting. The hydraulic valve is then completely open. There are diagnostics for the solenoid.
Line pressure solenoid, SLT
The line pressure solenoid, SLT is in the transmission control system, which is mounted on the front edge of the transmission. The line pressure
solenoid, SLT consists of an electric coil which controls a hydraulic valve. The solenoid is controlled by pulse width modulation (PWM) voltage and
is grounded via the control module. The solenoid is linear. The hydraulic valve is controlled by the varied current which is the result of the current
pulse conditions. During high pulse conditions, (at high currents (approximately 1 A)) the line pressure is low. During low pulse conditions (at low
currents) the line pressure is high. The solenoid also engages and disengages neutral control. In the event of an open-circuit the line pressure reaches
maximum which causes hard shifting. The hydraulic valve is then completely open. There are diagnostics for the solenoid.
Transmission input speed sensor (speed of the input shaft)
The transmission input speed sensor (speed of the input shaft) is on the top of the transmission housing. The sensor is an active sensor and is supplied
with 12 V. When the pulse wheel on clutch C1 rotates, the sensor generates a pulsed current (quadratic wave) where the strength of the current
depends on the position of the pulse wheel. The signals from the coils in the sensor are then affected by a magnetic resistance element, which
