DTC 56

Codes 56 & 57: Pressure Sensor Circuit, DTC Chart:

Pressure Sensor Circuit, Wiring Diagram:

Pressure Sensor Circuit, Inspection Procedure:

CIRCUIT DESCRIPTION
The Pressure Sensor detects the TRAC Accumulator hydraulic pressure and if it is low, it sends signals to the ECU to operate the pump. If the pressure is high, it sends signals to the ECU to stop the pump.

FAIL SAFE FUNCTION
If trouble occurs in the pressure sensor circuit, the ECU cuts off the current to the TRAC solenoid relay and prohibits TRAC control.