P2725

DTC P2725 Pressure Control Solenoid "E" Electrical (Shift Solenoid Valve SLN)

CIRCUIT DESCRIPTION

DTC Detecting Condition:

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 charge 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

Reference:




- Refer to the chart for the waveform between terminals SLN- and E1 when engine is idling.




- Refer to the chart for the waveform between terminals SLN- and E1 during shift change.

MONITOR DESCRIPTION

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

Component Operating Range:

The shift solenoid valve SLN controls the oil pressure to the accumulator control valve to reduce transmission gearshift shock.

The ECM judges the appropriate oil pressure based on the signals from the throttle position sensor, the output speed sensor and the input speed sensor, and adjusts the oil pressure by sending a duty-ratio signal to the shift solenoid valve SLN. The ECM illuminates the MIL and stores the DTC when it detects an open or a short circuit malfunction in the shift solenoid valve SLN.

Wiring Diagram:

Step 1 - 2:

Step 3:

INSPECTION PROCEDURE