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Home >> Lexus >> 2008 >> IS 250 RWD, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (A760H Automatic Transaxle) >> Automatic Transmission System >> DTC P0894 Transmission Component Slipping; DTC P2714 Pressure Control Solenoid "D" Performance (Shift Solenoid Valve SLT) >> Description

DTC P0894 Transmission Component Slipping; DTC P2714 Pressure Control Solenoid "D" Performance (Shift Solenoid Valve SLT): Description

WARNING: This page is about a different variant/trim than selected.
Fig 1: Line Pressure Graph
G05289579Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

The linear solenoid valve (SLT) controls the transmission line pressure for smooth transmission operation based on signals from the throttle position sensor and the vehicle speed sensor. The ECM adjusts the duty ratio (*) of the SLT solenoid valve to control hydraulic line pressure coming from the primary regulator valve. Appropriate line pressure assures smooth shifting with varying engine outputs.

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

DTC DETECTION CONDITION CHART

DTC No. DTC Detection Condition Trouble Area
P0894 ECM detects a malfunction on SLT, S1, S2, S3, S4, SL2, gear 6 incorrect ratio (sequence valve) or 1-2 shift solenoid valve according to the revolution difference of the turbine and the output shaft, and also by the oil pressure. (2-trip detection logic)
  • Shift solenoid valve SLT remains open or closed
  • Shift solenoid valve S1, S2, S3, S4 or SL2 remains open or closed
  • Gear 6 incorrect ratio (sequence valve) or 1-2 shift valve is stuck
  • Valve body is blocked
  • Automatic transmission (clutch, brake, gear, etc.)
P2714 ECM detects a malfunction on SLT (ON side) according to the revolution difference of the turbine and the output shaft, and also by the oil pressure (2 trip detection logic)
  • Shift solenoid valve SLT remains open or closed
  • Shift solenoid valve S1, S2, S3, S4 or SL2 remains open or closed
  • Gear 6 incorrect ratio (sequence valve) or 1-2 shift valve is stuck
  • Valve body is blocked
  • Automatic transmission (clutch, brake, gear, etc.)