DTC P0400 - EGR FLOW MALFUNCTION Hyundai Sonata III рестайлинг

Testing & Diagnostics

Install scan tool. Start engine and check if DTC P0400 is present. If DTC is present, go to next step. If DTC is not present, problem is intermittent. See INTERMITTENTS in «TESTS W/O CODES»(ref-16659) article.
Check vacuum signal to EGR valve. Check for blocked EGR passage, leaking vacuum hose to EGR valve, vacuum hose routing or faulty EGR valve. See EMISSION SYSTEMS & SUB-SYSTEMS in «SYSTEM/COMPONENT TESTS»(ref-16633) article. Repair or replace as necessary. If EGR valve and system is okay, diagnose EGR solenoid. For diagnosis, see DTC P0403.

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