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Table 1. Communication Table Transmitting ECU (Transmitter) Receiving ECU Signal Communication Method ECM Power steering ECU Engine variation information signal Engine speed signal TC terminal condition CAN Skid control ECU Power steering ECU Vehicle speed (SP1) status signal Vehicle speed (SP1) signal Test mode signal Vehicle state quantity signal* Target additional torque signal* Target steering angle, target additional torque validity signal* CAN Combination meter Power steering ECU Transmitting system diagnosis No. signal CAN Power steering ECU ECM EPS idle up request signal CAN Power steering ECU Air conditioning amplifier Loading control level signal CAN Power steering ECU Combination meter EPS warning light on request signal EPS diagnosis code signal Transmitting system diagnosis No. signal CAN