| Cause of malfunction | Method of elimination |
| Insufficient compression in engine cylinders | |
| The cylinder head gasket is blown | Replace the gasket |
| Worn or damaged piston rings | Replace piston rings |
| Wear of pistons or cylinders | Repair or replace pistons and/or cylinder block |
| Worn or damaged valve seats | Repair or replace valves and/or valve seats |
| Low oil pressure | |
| Insufficient oil level | Check and, if necessary, bring the oil level up to normal |
| Oil pressure warning light sensor malfunction | Replace the sensor |
| Clogged oil filter | Replace the filter |
| Wear of gears or oil pump cover | Replace the oil pump |
| Low viscosity or diluted oil | Determine the cause and change the oil |
| Oil pump pressure relief valve stuck (in open position) | Fix the problem |
| Excessive clearance between the bearings and the main journals of the crankshaft | Grind the journals and replace the liners |
| High oil pressure | |
| Oil pump pressure relief valve stuck (in closed position) | Fix the problem |
| Increased engine vibration | |
| Loosening of engine suspension balance beam mounts (front, rear) | Tighten the fasteners |
| Loosening of the gearbox suspension bracket | Same |
| Loose engine mount | Same |
| Loosening of the crossbar mount | Same |
| Destruction of the elastic support of the gearbox suspension bracket | Replace the support |
| Destruction of the elastic support of the engine mount bracket | Same |
| Destruction of the engine suspension balance beam support cushion | Replace the pillow |
| Valve knocking | |
| Thin or diluted engine oil (low oil pressure) | Change oil |
| Worn or damaged valve stems or guides | Replace valves and guide bushings |
| Knocking of connecting rod bearings and/or crankshaft main bearings | |
| Insufficient oil supply | Check the oil level |
| Low viscosity or diluted oil | Change the oil and determine the cause |
| Excessive clearance between the bearing shells and the main and/or connecting rod journals of the crankshaft | Grind the journals and replace the liners |
| Timing Belt Noise | |
| Incorrect belt tension | Adjust the belt tension |
| Coolant level low | |
| Coolant leaks: through heater or radiator hoses through a loose radiator cap through the thermostat housing from the radiator | Fix the leak or replace parts Tighten the plug or replace the clamps Replace gasket or housing thermostat Fix the problem or replace the radiator |
| Clogged radiator | |
| Foreign impurities in the coolant | Replace coolant |
| High coolant temperature | |
| Thermostat malfunction | Replace thermostat parts |
| Radiator cap malfunction | Replace parts |
| Reduced cooling system capacity | Restore capacity or replace parts |
| Loose or missing water pump drive belt | Adjust belt tension or replace belt |
| Water pump failure | Replace the pump |
| Malfunction of the electric fan switch sensor or its wiring | Fix the problem or replace |
| Electric fan malfunction | Fix the problem or replace the electric fan |
| Insufficient coolant level | Restore the level to normal |
| Low coolant temperature | |
| Thermostat malfunction | Replace the thermostat |
| Coolant temperature sensor or its wiring is faulty | Fix the problem or replace |
| Fluid leaks from the oil cooler system | |
| Loosening connections | Replace faulty connections |
| Cracks or damage to hoses, lines or oil cooler | Replace or repair the fault |
| The electric fan of the cooling system does not turn on | |
| Malfunction of the electric motor switch, electric fan relay or wiring | Fix the problem or replace the faulty unit |
| Exhaust gas leak | |
| Loosening connections | Tighten the connections |
| Broken pipes or mufflers | Fix the problem or replace |
| Increased noise from the exhaust system | |
| Breakage of plates in mufflers | Replace the muffler |
| Breakage of rubber suspension parts | Replace parts |
| Contact of pipes or mufflers with the body | Eliminate touch |
| Broken pipes or mufflers | Repair the break or replace |