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ABS/ESP SYSTEM STAVIC - 2004.09 39 4K CHANGED BY EFFECTIVE DATE AFFECTED VIN 6. COMPONENTS DESCRIPTION HECU (Hydraulic and Electronic Control Unit) HECU Installed in a Vehicle HECU consists of motor pump, solenoid valve and ECU. ECU connector has 47 pins and the number of valves in valve body is 12 when equipped with ESP(6 valve for ABS/EBD), Comparison between ESP HECU and ABS/EBD HECU RL: Rear left RR: Rear right FL: Front left FR: Front right Secondary Primary ABS/EBD HECU (2 ports 3 chnnels) ESP HECU (2 ports 4 chnnels) |