When a malfunction cannot be confirmed by the DTC check, troubleshooting should be performed on all circuits that are possible causes of the problem. However, in most cases, performing the basic engine check shown below can help you find the problem quickly and efficiently. Always perform this check first when troubleshooting the engine.
CHECK BATTERY VOLTAGE
Perform the battery voltage check with the engine stopped and ignition switch off.
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CHECK IF ENGINE WILL CRANK
CHECK AIR FILTER
Visually check that the air filter is not excessively contaminated with dirt or oil.
CHECK FUEL QUALITY
Check that only diesel fuel is being used.
Check that the fuel does not contain any impurities.
CHECK FUEL FOR AIR
CHECK FUEL PIPES AND HOSES
Check that the fuel pipes and fuel hoses are not blocked, damaged, disconnected or bent.
CHECK FUEL FILTER FOR BLOCKAGE
CHECK ENGINE OIL
CHECK ENGINE COOLANT
CHECK IDLING SPEED AND MAXIMUM SPEED
CHECK DIAGNOSTIC CIRCUIT
CHECK VACUUM PUMP