How a Catalytic Converter Works: Three-Way Catalyst, DOC and ECU Catalyst Monitoring
How catalytic converters work: three-way catalyst chemistry, lambda window, light-off, oxygen storage, diesel DOC and how the ECU monitor sets P0420.
How ECU Limiters Work: Rev Limiter, Speed Limiter, Torque and Smoke Limits Explained
How ECU limiters work: soft and hard rev cut, vehicle speed limiter, per-gear torque, diesel smoke limit, temperature and altitude derates.
How the EVAP System Works: Charcoal Canister, Purge Valve and ECU Leak Detection
How petrol EVAP systems work: charcoal canister, PWM purge valve, vent valve, tank pressure sensor, ECU leak tests, fuel trims and P0440–P0457.
WinOLS and Calibration Editors Explained: How ECU Maps Are Found, Scaled and Edited
How calibration editors like WinOLS work: data organisation, factor and offset, axes, map families, file comparison, checksums and related DTCs.
How Engine Brakes Work: Exhaust Brakes, Compression-Release Brakes and ECU Control
How diesel engine brakes work: exhaust flap brakes, compression-release brakes, VGT braking, ECU enable conditions and fault codes P0475/P2563.
How an Intercooler Works: Charge-Air Cooling and How the ECU Uses Post-IC Air Temperature
How an intercooler (charge-air cooler) works: air-to-air vs air-to-water, placement, density, boost leaks and how the ECU uses post-IC IAT.
How a Hybrid Powertrain Works: P0–P4 Layouts, Power-Split, HV Battery and Hybrid Control
How hybrid powertrains work: P0–P4 and power-split layouts, HV battery and BMS, inverter, HVIL safety, hybrid control unit torque coordination and DTCs.
How CAN Bus Works: Vehicle Networks, Gateways and How ECUs Talk to Each Other
How CAN bus works: CAN-H/CAN-L levels, 120 ohm termination, arbitration, gateways, OBD and UDS diagnostics, J1939 trucks and ISOBUS tractors explained.
How Low-Pressure Fuel Supply Works: Lift Pumps, Regulators and ECU Pump Control
How tank pumps, regulators, filters and demand-controlled lift pumps feed petrol and diesel engines, how the ECU controls them, and why supply margin matters.
How a Dual-Clutch Transmission (DCT) Works: Clutches, Mechatronics and TCU Control
How a dual-clutch gearbox pre-selects gears, hands torque between two clutches, adapts kiss points, and why DCT and TCU calibration matter after a remap.