HYUNDAI i40
VIN: KMHLB81AAEU087451
- Technical inspection: took place in June 2025
- Mileage: 244593 km
- Usage pattern: daily middle range driving
- Symptoms: no warning lights, no drivability concerns
- Engine tuning: no
- ECU remapping: no
- Aftermarket parts: no
No diagnostic trouble codes (DTCs) from a vehicle’s on-board computer.
engine
Relative compression in the engine cylinders shows ideal balance.
Uniform pressure in all cylinders within normal limits.
Synchronization of the crankshaft and camshafts ensures the correct time of opening and closing of the engine valves relative to the position of the pistons.
Correct synchronization of the crankshaft and camshafts and uniform compression indicate the mechanical health of the engine and the correct operation of the injection and ignition systems.
No signs of insulation breakdown, misfiring or deterioration in performance were detected.
Response time and electrical signals – no deviations were found.
The cooling capacity and pressure in the system are within specifications; no leaks or abnormal noises were detected.
The serviceability is confirmed by analysis of the operation of the oxygen sensors (O₂ sensor) before and after the catalytic converter.
EVAP
Smoke sensor test passed, 100% leak free. EVAP “Ready” status confirms that the fuel tank ventilation system has passed the self-test.
The sensors transmit data on the air pressure in the tires. The batteries of the sensors are in good condition.
Voltage, cold source current and charge retention are tested and controlled according to settings.
Relative Compression
Current draw by starter motor.
Relative compression test shows perfect balance.
In-Cylinder Compression
Cyl#1
Cyl#2
Cyl#3
Cyl#4
Compression pressure specifications:
Standard 12.5kg/cm² (200~250rpm);
Minimum 11.0kg/cm²;
Deviation between cylinders 1.0kg/cm², or less.
Fuel Injectors (GDI)
Cyl#1.
Cyl#2.
Cyl#3.
Cyl#4.
Fuel injectors’ feed, ground and current.
Coils. Primary Voltage and Current vs. Secondary
Cyl#1 Primary. Secondary. Current.
Cyl#2 Primary. Secondary. Current.
Cyl#3 Primary. Secondary. Current.
Cyl#4 Primary. Secondary. Current.
All coils show the same signal shape.
No insulation breakdowns or unstable pulses were recorded.
Camshaft and Crankshaft Correlation
Camshafts correlation.
i40 workshop manual.
CKP/CMP correlation.
i40 workshop manual.
Catalytic Converter
Catalytic converter is functioning (based on upstream and downstream O₂ signals)
Air Conditioner
Driver’s left.
Passenger’s right.
Driver’s central.
Passenger’s central.
TPMS
Pressure.
Sensors’ batteries.