Master Automotive Diagnostics
From mechanics to advanced diagnostics.
Learn how modern vehicles work, measure electrical signals, interpret OBD data and solve real diagnostic cases.
Learning paths
Six progressive levels, from the fundamentals to modern electric vehicles. Learn, measure, analyse, diagnose, confirm.
Fundamentals
How a vehicle is built
Automotive Electricity
Measure, understand, repair
Automotive Electronics
Sensors, actuators and signals
Diagnostics
OBD-II and professional method
Advanced Diagnostics
Systems, symptoms and hard faults
Modern Vehicles
Hybrid, electric and software
Interactive diagrams
View all →Click every element to reveal its role, typical value, tests, faults and warnings.
Basic Electrical Circuit
Battery → fuse → switch → lamp → ground. Click any element to learn its role and how to test it.
electricalCharging Circuit
Alternator, rectifier, regulator, warning lamp and battery. Click parts to understand charging diagnosis.
electricalBattery Internal Construction
Six cells, plates and electrolyte — click to explore what is inside a 12 V battery.
fundamentalsVehicle Energy Flow
From fuel to motion — click each stage to understand the drivetrain.
Real diagnostic cases
View all →Practise like in the workshop: symptoms, DTCs, live data and a confirmed root cause.
Battery Discharges Overnight
The engine cranks slowly in the morning. The customer reports the battery has been replaced twice and the prob...
Engine Cranks But Will Not Start
The engine turns over at normal speed but does not fire. The customer ran out of fuel last week.
P0301 Cylinder 1 Misfire
Rough idle, slight shake and a loss of power. The check engine light is solid, not flashing.
Diagnostic trees
View all →Follow a guided decision path from symptom to probable cause.
Engine Won't Start
The engine does not start — either it does not crank or it cranks but will not fire.
Engine Overheating
Temperature rises above normal, coolant may be lost and the warning lamp may illuminate.
Battery Keeps Discharging
The vehicle is hard to start or the battery goes flat, especially after standing.
Check Engine Light On
The malfunction indicator lamp is illuminated, steady or flashing.
Loss of Power
The engine feels flat, especially under acceleration or on hills.
Rough Idle
The engine idles unevenly, shakes or nearly stalls at rest.