Description And Operation
DESCRIPTION
- (1) Steering gear pinion
- (2) Wire harness connector from Electric Power Steering (EPS) module to pinion housing
- (3) EPS group module and motor for power assistance
- (4) Electric motor to gear with ball screw connection
OPERATION
The pinion of the steering gear is physically connected the rack of the steering gear. If the servo assist is absent the driver always has the ability to control the vehicle.
Two sensors are located in the pinion housing:
- Torque sensor
- Angle sensor
The feedback from the torque sensor aids the EPS module in managing the servo assist.
The angle sensor signals the 0 degrees position of the steering during each revolution.
The angle sensor is used by the EPS module for the calibration of the servo assist system and the plausibility of steering position and to be able to generate the steering angular value
In calculating the plausibility of the steering position (and thus of the front wheels), there are many other values used including vehicle speed and the speed of the individual wheels.
The EPS module controls and regulates the EPS system.
The power supply for the EPS module is supplied by the battery via the circuit protected by an 80 amp maxi fuse in the remote jump positive post at pin 1 of connector C1 of the EPS module. Pin 2 of connector C1 of the EPS module is grounded.
The ignition-operated supply (INT) comes from a circuit protected by a 7.5 amp fuse in the BCM, at pin 6 of connector C2 of the EPS module.
The Body Control Module (BCM) receives direct battery power via a circuit protected by a 70 amp maxi fuse in the Battery Distribution Unit (BDU).
The BCM receives an ignition-operated power supply (INT) at pin 12 of connector C7 by the signal coming from the Radio Frequency Hub (RFH) module. Pins 1 and 11 of connector C6 of the BCM provide the BCM with a reference ground.
The EPS module is connected through the Controller Area Network (CAN) pins 7 and 8 of connector C2, to the other nodes, in particular the BCM, Antilock Brake System (ABS) module and Instrument Panel Cluster (IPC) to which it sends the signals for the "Electric Power Steering Failure" warning light.