Scan Tool Testing and Procedures
Scan Tool DataNOTE: When P/S motor is cold condition (that is, armature coil of P/S motor is not heated), normal value with asterisk (*) mark in the following table is displayed on scan tool
Scan Tool Data Definitions
Power Supply Voltage
This parameter indicates battery positive voltage.
Sensor Power Supply (Torque Sensor Power Supply, V)
This parameter indicates the power supply voltage which the P/S control module supplies to the torque sensor.
Sensor (Main) Torque (Torque Sensor Main Torque, Nm)
The torque sensor is installed to detect the steering force and the steering direction. It consists of two potentiometers and the main torque sensor is one of these.
Sensor (Sub) Torque (Torque Sensor Sub Torque, Nm)
The torque sensor is installed to detect the steering force and the steering direction. It consists of two potentiometers and the sub-torque sensor is one of these. Its output characteristics are compared with those of the main torque sensor.
Control Torque (Nm)
This parameter is an internal parameter of the P/S control module. It is obtained by computing the torque sensor input signal.
Target Motor Current (Motor Control Current, A)
Based on the input signal, the P/S control module determines the assist amount and controls the current to the motor suitable for that assist amount. This parameter indicates that control value.
Measured MOT Current (Motor Monitor Current, A)
This parameter indicates the actually measured value of the current flowing to the motor. The motor circuit condition is diagnosed by comparing this parameter with "Motor Control" parameter described previously.
Vehicle Speed (km/h, MPH)
Vehicle speed signal is fed from BCM. P/S control module determines the amount of power assist based on this vehicle speed signal and the torque sensor signal.
Engine Speed (rpm)
Engine speed signal is fed from the ECM so that it can be used for trouble diagnosis of the electric power steering system.
Motor Drive Voltage (V)
This parameter indicates the voltage between motor terminals.
System Power Status (EPS System Power, ON, OFF)
This parameter indicates input status of EPS system power supply.
IGN switch Status (ON, OFF)
This parameter indicates the condition of the power supply through the ignition switch.
Torque sensor Status (ON, OFF)
This parameter indicates the output status of the torque sensor power supply.
Fail Safe FET Status (ON, OFF)
This parameter indicates the status of the motor drive power supply circuit.