General Information

Electric Hydraulic Power Steering
C1603 ECU thermal protection - General Information

Component Location





General Description

EHPS (Electro Hydraulic Power Steering) is assitance steering ability system uses electrical motor that generate oil pressure not to use the Engine power.
Temperature sensor is installed is MPU(Motor Pump Unit) in order to measure oil temperature, This sensor uses a thermistor whose resistance changes according to the temperature changes.
MPU ECU perform limit current control to prevent from over-heating and motor speed control according to viscosity changes.

DTC Description

The MPU limit MPU-motor's current according to temperature sensor's signal.The MPU set this code If the current amont for MPU motor be limitted.
(If C1101 or C1102 output same time with C1603, Check and repair C1101 or C1102 preferential. If C1262 output same time with C1603, Check and repair C1262 preferential.)

DTC Detecting Condition





Diagnostic Circuit Diagram