DTC 46

DTC 46 Shift Solenoid Valve SLN Circuit





CIRCUIT DESCRIPTION
The shift solenoid valve SLN controls the hydraulic pressure acting on the brakes and clutches of the planetary gear units 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 O/D clutch speed sensor and controls the volume of current flow to the solenoid valve.
The amount of electric current to the solenoid is controlled by the (*) duty ratio of ECM output signals, causing 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.
The duty ratio is the ratio of the period of continuity in one cycle.

Duty Cycle Example:

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 x 100(%)





DETECTING CONDITION

Reference

Reference Waveform Idling:

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

Reference Waveform While Shifting:

- Waveform between terminals SLN and E1 during shift change.





WIRING DIAGRAM

Step 1 Part A:

Step 1 Part B:

Step 2:

INSPECTION PROCEDURE