Independent automotive knowledgeSafety first. Verify vehicle-specific specifications before repair.
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CONNECTED COMPONENT ENCYCLOPEDIA

Understand the part.
Then test the system.

A symptom or trouble code rarely proves one component failed. Each part page connects function, failure patterns, testing, codes, and repairs.

✓ General automotive knowledge
IAR VISUAL WORKFLOWSymptom → system → component → test → verify

A component page is a connected reference point. Follow the system evidence before deciding whether a part is involved.

  1. 01
    ObserveSymptom, timing, and operating condition
  2. 02
    GroupSystem and related component roles
  3. 03
    CompareInputs, outputs, connections, and condition
  4. 04
    TestUse the right tool and exact procedure
  5. 05
    VerifyConfirm the system after any repair

Follow the sequence, stop when evidence changes the path, and verify the exact vehicle information before acting.

STARTER COMPONENT LIBRARY

Parts in diagnostic context

General component knowledge is clearly separated from vehicle-specific circuits, locations, and specifications.

01 · Starting & electrical

Battery

Stores electrical energy, stabilizes supply, and supports cranking. Test state of charge and condition separately.

Open topic →02 · Charging

Alternator

Converts mechanical input into electrical power under control strategies that vary by vehicle.

Open topic →03 · Starting

Starter

Uses high current to rotate the engine. Control-circuit and cable faults can imitate motor failure.

Open topic →04 · Ignition

Ignition coil

Raises voltage for the spark event. A misfire is evidence to test, not proof of coil failure.

Open topic →05 · Ignition

Spark plug

Creates the controlled spark gap inside the cylinder. Condition can reveal but not alone prove other faults.

Open topic →06 · Fuel

Fuel injector

Meters fuel when commanded. Electrical, hydraulic, mixture, and mechanical tests answer different questions.

Open topic →07 · Cooling

Water pump

Supports coolant circulation. Leaks, drive condition, flow, and engine design affect diagnosis.

Open topic →08 · Cooling

Thermostat

Regulates coolant flow by temperature. Slow warm-up and overheating require different evidence.

Open topic →09 · Cooling

Radiator

Transfers coolant heat to airflow. External blockage, internal restriction, leakage, and fan behavior matter.

Open topic →10 · Emissions

Oxygen sensor

Reports exhaust oxygen behavior for control and monitoring. A lean code does not automatically condemn it.

Open topic →11 · Air metering

MAF sensor

Measures intake airflow on systems that use it. Intake integrity and sensor plausibility must be evaluated together.

Open topic →12 · Tires & electronics

TPMS sensor

Supports tire-pressure monitoring. Protocol, frequency, programming, and registration are application-specific.

Open topic →13 · Brakes

Brake rotor

Provides a friction surface and absorbs heat. Surface condition, runout, thickness, mounting, and hub condition interact.

Open topic →14 · Brakes

Brake pad

Creates friction against a rotor. Wear pattern can reveal hardware, hydraulic, mounting, or heat concerns.

Open topic →