Isuzu 2008MY N Series, Руководство по ремонту

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Engine Control System (4HK1) 1A-367
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.
• A restriction or damaged at MAF sensor.
• A worn or damaged turbocharger turbine wheel, shaft or compressor wheel.
Oil leak from turbocharger. Refer to Turbocharger Assembly in Section 1J
Induction.
Exhaust System Checks If an excessive white smoke is present while DPD filter regeneration process, a
deteriorated or damaged oxygen catalyst is suspected.
Engine Mechanical Checks Inspect the engine mechanical for the following conditions. Refer to the Section
1B Engine Mechanical.
• Poor cylinder compression.
• Improper mechanical timing (timing gear).
• Improper valve gap.
• Broken or weak valve springs.
• Worn camshaft lobes.
• Thermostat working (open stuck).
• Any excessive oil entering combustion chamber.
Electrical System Checks • Glow plug control (preheating) system operation. Refer to Glow Control
System Check in this section.
Checks Action
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