FUSO 4M4 – INTAKE AND EXHAUST – ON-VEHICLE INSPECTION AND ADJUSTMENT – Inspection of Exhaust Gas

• If the diesel particulate filter clogs early, or if a large amount of soot adheres inside the diesel particulate filter outlet body, check whether it is caused by the engine-related (engine, common rail system, exhaust gas recirculation system, etc.) fault or not as follows.

8.1 Preparation
• Place the transmission in neutral.
• Turn the steering wheel in neutral position and securely apply the parking brake.
• Connect the Multi-Use Tester. (See Gr00.)
• Check diagnosis code of each electronic control system. If any fault exists, rectify it.
• Warm up the engine until the engine coolant has been heated to more than 70°C.
(Check by Multi-Use Tester service data “13: Water temperature”.)

8.2 Inspection procedure

• Remove diesel particulate filter, each sensor, pipe and hose and install between front pipe and tail pipe. (See “DIESEL PARTICULATE FILTER”.)
• Race the engine with the tool attached and check to see if the exhaust gas is white or black. If any apparently white or black smoke is emitted, check the following and repair the faulty components as necessary.
– Common rail system (See Gr13.)
– Exhaust gas recirculation system (See Gr17.)
– Exhaust shutter
– Air cleaner
– Turbocharger
– Boost pressure
– Compression pressure (See Gr11.)
• After inspection, remove and install diesel particulate filter between front pipe and tail pipe. Then reinstall the removed sensors, pipes and hoses. (See “DIESEL PARTICULATE FILTER”.)
• Be sure to erase diagnosis codes after the end of inspection as engine warning lamp may illuminate by diagnostic function when sensors installed on diesel particulate filter are removed.

 

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