B2557

B2557 VEHICLE SPEED





Description
BCM receives the 2 vehicle speed signals via CAN communication. One signal is transmitted by the "unified meter". Another signal is transmitted by "ABS actuator and electric unit (control unit)". BCM compares both signals to detect the vehicle speed.




DTC Logic

DTC DETECTION LOGIC

NOTE:
- If DTC B2557 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to Vehicle Security System.
- If DTC B2557 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to Vehicle Security System.






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.
Is DTC detected?
YES - Refer to "Diagnosis Procedure".
NO - Inspection End.




Diagnosis Procedure
1. CHECK DTC WITH "ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)"
Check "Self Diagnostic Result" with CONSULT-III. Refer to Testing and Inspection.
Is the inspection result normal?
YES - GO TO 2.
NO - Repair or replace.
2. CHECK UNIFIED METER.
Check unified meter. Refer to Work Flow.
Inspection End.