System Description

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

Based on signals from the accelerator position sensor and speed sensors (NC3, SP2 and NT), the TCM controls the solenoid valve (SLT) using a predetermined duty ratio* As a result, the line pressure is adjusted to a pressure that is appropriate for the throttle angle and engine output. Based on rotation speed from the transmission speed sensors (NT, NC3 and SP2), the TCM calculates the heat level of the friction material, and detects clutch slippage, etc

HINT:

*: The duty ratio is the ratio of the current ON time (A) to the total of the current ON and OFF time (A + B). Duty Ratio (%) = A / (A + B) x 100

Fig 1: Hydraulic Pressure Graph

DTC DETECTION CONDITION AND TROUBLE AREA

DTC Code	DTC Detection Condition Diagnosis Condition Malfunction Status Other	Trouble Area
P2714	ECT is 40°C (104°F) or more, ATF temperature is -10°C (14°F) or more, and vehicle is driven with shift lever in D (no malfunctions are detected in shift solenoid valve SL1, 2, 3, 4 and 5, SR, SLT, speed sensors (NT, NC3, SP2), water temperature sensor, oil temperature sensor, knock control sensor, electronic throttle, or CAN2) Engine overruns at engine torque that is above each gear's set engine torque Clutch is judged to be slipping, and friction material is overheated beyond specified threshold 2 trip detection logic	Shift solenoid valve SL1 Shift solenoid valve SL2 Shift solenoid valve SL3 Shift solenoid valve SL4 Shift solenoid valve SL5 Shift solenoid valve SLT Valve body assembly Automatic transmission assembly