The steering torque, assist current, voltage, temperature and rack-force values in this module are simplified fictional teaching data—not vehicle specifications or repair instructions. Follow exact service information for steering-system disablement, high-current EPS testing, hydraulic pressure/flow testing, calibration, alignment and post-repair verification. Browser completion is not practical competency.
From suspension architecture to steering force and control
12.1 established geometry and 12.2 established wheel-location/load-support hardware. 12.3 traces driver input through the steering mechanism and assist system. Previous: 12.2 Suspension Designs, Springs & Dampers. Next planned module: 12.4 · Wheels, Tires & Tire Pressure Monitoring.
Trace the steering path before choosing the failed subsystem
Fictional EPS command → electrical capability → assist response
Change driver torque, vehicle speed, supply voltage and mechanical resistance. The model illustrates relationships only; it is not an EPS calibration map.
Normalized teaching model: driver torque creates an assist request; speed reduces assist demand; low voltage limits current capability; mechanical resistance reduces resulting rack movement.
Separate mechanical steering from assist-system faults
Ordered steering diagnostic sequence
Complete the sequence in order.
Evidence
Best supported conclusion / next step
10-question knowledge check
Online steering knowledge is not hands-on steering competency
Use a training vehicle or approved component board under instructor supervision. Follow service information for lifting/support, EPS high-current circuits, steering-system centering/calibration and hydraulic procedures where applicable.
Student: ____________________ Date: __________ Instructor: ____________________
Use adjacent chassis/electrical work for supporting context
There was no dedicated historical 12.3 steering mini-course, so this module does not claim one. These links preserve related prior work that supports steering/EPS understanding.