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ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-331 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. Exhaust System Checks Inspect the exhaust system for a possible restriction. Refer to the Exhaust System Engine Mechanical Checks Inspect the engine mechanical for the following conditions. Refer to the Engine • Poor cylinder compression. • Improper mechanical timing (timing gear and timing chain). • Improper valve gap. • Broken or weak valve springs. • Worn camshaft lobes. • Incorrect basic engine parts such as camshaft, cylinder head, pistons, etc.. Additional Checks • Electromagnetic interference (EMI) on the reference circuit can cause an engine miss condition. The scan tool can usually detect EMI by monitoring the engine • Faulty engine mounts. • Faulty crank pulley. • Faulty generator & A/C compressor. • Generator output voltage. • EGR system operating correctly. Refer to EGR Control System Check in this section. • A/C operation. Checks Action |