Isuzu 2008MY N Series, Руководство по ремонту

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Engine Control System (4HK1) 1A-371
Air Intake System Checks Inspect the air intake system for the following conditions.
• Air cleaner, air intake ducts and charge air cooler for a restriction, holes, or
leaks.
• A restriction in the turbocharger inlet duct.
• Intake throttle valve for a stuck condition.
• A restriction or leak in the intake manifold.
• Modified air induction system.
• A restriction or damaged or any contamination or objects that block at MAF
sensor.
• A worn or damaged turbocharger turbine wheel, shaft or compressor wheel.
Refer to Turbocharger Assembly in Section 1J Induction.
Exhaust System Checks Inspect the exhaust system for the following conditions. Refer to Exhaust
System in Section 1G Engine Exhaust.
• An exhaust system gasket that is missing or damaged.
• Exhaust gas leakage from the exhaust pipe, gasket, DPD assembly,
exhaust temperature sensor(s) or exhaust differential pressure hoses or
pipes.
• Modified exhaust system.
• Exhaust throttle valve or exhaust brake valve for stuck condition. Refer to
Exhaust System in Section 1G Engine Exhaust.
• DPD filter for damage, cracks, melt or excessive deposits.
• Oxygen catalyst for damage, cracks, melt or excessive deposits.
• If an excessive white smoke is present while regeneration process, a
deteriorated or damaged oxygen catalyst is suspected.
Additional Checks • Inspect for an engine overheat condition. Refer to Cooling System in
Section 1C Engin Cooling.
• Inspect the A/C operation.
Checks Action
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