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SEC-74 < COMPONENT DIAGNOSIS > [COUPE] B2557 VEHICLE SPEED B2557 VEHICLE SPEED Description INFOID:0000000004206037 BCM receives the 2 vehicle speed signals via CAN communication. 1 signal is transmitted by the “unified meter” Another signal is transmitted by “ABS actuator and electric unit (control unit)”. BCM compares both sig- nals to detect the vehicle speed. DTC Logic INFOID:0000000004206038 DTC DETECTION LOGIC NOTE: • If DTC B2557 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to . • If DTC B2557 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to . DTC CONFIRMATION PROCEDURE 1. PERFORM DTC CONFIRMATION PROCEDURE 1. Drive the vehicle at the vehicle speed of 10 km/h or more and wait for at least 10 seconds. 2. Check “Self diagnostic result” with CONSULT-III. YES >> Refer to . NO >> Inspection End. Diagnosis Procedure INFOID:0000000004206039 1. CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)” Check “Self diagnostic result” with CONSULT-III. Refer to (ABS), (TCS/ABS) or Is the inspection result normal? YES >> GO TO 2 NO >> Repair or replace malfunctioning parts. 2. CHECK UNIFIED METER. Check unified meter. Refer to >> Inspection End. DTC Self-diagnosis name DTC detecting condition Possible causes B2557 VEHICLE SPEED BCM detects the following difference between the vehicle • Wheel sensor unit (control unit) |