P1765

DTC P1765 Linear Solenoid For Accumulator Pressure Control/Shift Solenoid Valve SLN Circuit Malfunction

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.

Reference Graph:

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 Cycle Example:

(*) 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

Duty Ratio = A/A+B * 100 (%)





DETECTING CONDITION

Reference

Reference Waveform - Engine Idling:

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

Reference Waveform - During Shift Change:

- Waveform between terminals SLN and E1 during shift change.





WIRING DIAGRAM

Step 1:

Step 2:

INSPECTION PROCEDURE