Engine
Starting, ignition, fuel, air and mechanical health.
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Learn what each system does, how its components connect, and which symptoms point toward—or away from—it.
Use the systems encyclopedia to narrow a complaint without skipping the evidence that separates similar causes.
Follow the sequence, stop when evidence changes the path, and verify the exact vehicle information before acting.
Start broad, then move toward components only as evidence narrows the fault.
Starting, ignition, fuel, air and mechanical health.
Battery delivery, starter control, interlocks and engine cranking.
Electrical generation, energy management, cables and grounds.
Power distribution, wiring, modules, sensors and communication.
Power flow, shifting, hydraulic control and electronic strategy.
Hydraulics, friction, ABS and pedal concerns.
Ride control, wheel location, springs, dampers and joints.
Driver input, assist, geometry and wheel direction.
Temperature control, circulation, airflow and sealing.
Storage, delivery, pressure, injection and mixture support.
Cabin heating, ventilation, air conditioning and air distribution.
Exhaust flow, aftertreatment, vapor control and monitoring.
Torque distribution, transfer cases, differentials and axles.
Road contact, inflation, balance, mounting and TPMS.
Read codes and supported live data
Open tool guide →Measure voltage, resistance, and continuity safely
Open tool guide →Evaluate battery performance under an appropriate test
Open tool guide →Check for external cooling-system leaks
Open tool guide →Compare cylinder sealing during cranking
Open tool guide →Apply verified fastener specifications
Open tool guide →IAR explains maintenance items and inspection logic without inventing a universal schedule. Check the owner’s manual and manufacturer information for mileage, time, fluid, and severe-service requirements.
Open maintenance knowledge →