The pressure thresholds, leak rates, imbalance values, rolling-radius relationships and TPMS logic in this module are simplified fictional teaching data—not vehicle specifications or repair instructions. Use the exact vehicle placard and service information for tire size/load/speed requirements, cold inflation pressure, wheel torque, repairability, balance/runout limits, sensor service and TPMS initialization/relearn. Browser completion is not practical competency.
From steering and suspension to the road-contact assembly
12.1 established geometry, 12.2 established suspension motion, and 12.3 traced steering input. 12.4 focuses on the wheel/tire assembly that actually contacts the road and on how direct or indirect TPMS interprets tire condition. Previous: 12.3 Steering Systems & Electric Power Steering. Next planned module: 12.5 · Wheel Alignment & Measurement.
Separate the physical tire/wheel condition from the monitoring architecture
Fictional pressure + leak + imbalance + rolling-radius evidence
Change pressure, leak trend, imbalance, rolling-circumference mismatch and road speed. Watch how the evidence channels separate a real pressure loss from a speed-related vibration or an indirect-TPMS plausibility problem.
Fictional teaching reference: placard target 35 psi. The displayed thresholds and vibration/plausibility indices are deliberately normalized and must not be used as vehicle specifications.
Do not let a warning lamp replace wheel-and-tire evidence
Ordered wheel/tire/TPMS diagnostic sequence
Complete the sequence in order.
Evidence
Best supported conclusion / next step
10-question knowledge check
Online wheel/tire knowledge is not hands-on tire service competency
Use approved training equipment and exact service information. Tire inflation, lifting/support, wheel fastener service, tire repair, balancing and sensor service can involve serious safety hazards and equipment-specific procedures.
Student: ____________________ Date: __________ Instructor: ____________________
Use prior chassis work as supporting evidence
There was no dedicated historical 12.4 TPMS mini-course in the recovered catalog. These links preserve adjacent chassis/control material without falsely labeling it as a completed TPMS course.