Circuit Description
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 Toyota Tundra, 2002 Toyota Tacoma, 2002 Toyota Sequoia, 2002 Toyota 4Runner, and 2001 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.
Throttle pressure is applied to primary regulator valve, which modulates line pressure and causes SLT solenoid to precisely modulate line pressure according to accelerator pedal effort, or engine power output detected. This reduces fluctuation of line pressure and provides smooth shifting. Upon receiving throttle valve opening angle signal, ECM controls line pressure by sending predetermined duty cycle ratio to SLT solenoid, activating solenoid, modulating line pressure and generating throttle pressure. DTC is output when voltage at SLT- terminal at ECM is zero or 12 volts for one second or more, indicating a solenoid duty cycle is not present. Possible causes are:
- SLT solenoid open or short circuit.
- SLT solenoid malfunction.
- ECM malfunction.