P1765

DTC P1765 SHIFT SOLENOID VALVE SLN CIRCUIT
(FOR ACCUMULATOR BACK PRESSURE MODULATION

CIRCUIT DESCRIPTION
The shift solenoid valve SLN controls the hydraulic pressure acting on the accumulator control valve when gears are shifted and performs smooth gear shifting.

The ECM determines optimum operating pressure according to the signals from the throttle position sensor, vehicle speed sensor and direct clutch speed sensor and controls the volume of current flow to the solenoid valve.




The amount of current to the solenoid is controlled by the (*) duty ratio of ECM output signals, causing a momentary change to the hydraulic pressure acting on the clutches during gear shifting. When the duty ratio is high, the hydraulic pressure acting on the clutches is low.

(*) Duty Ratio:
The duty ratio is the ratio of the period of continuity in one cycle.
- For example, if A is the period of continuity in one cycle, and B is the period of non-continuity,then:








DETECTING CONDITION





INSPECTION USING AN OSCILLOSCOPE

Waveform between terminals SLN and E1 when engine is idling.:

Waveform between terminals SLN and E1 during shift change.:

WIRING DIAGRAM

Shift Solenoid Valve SLN Circuit:

INSPECTION PROCEDURE