B2557 VEHICLE SPEED

Description
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 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 See: U Code Charts\U1000\Security System\Coupe.
• If DTC B2557 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to See: U Code Charts\U1010\Security System\Coupe.

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 See: Testing and Inspection (ABS), See: Testing and Inspection, "DTC See: Testing and Inspection (VDS/TCS/ABS).
Is the Inspection result normal?
YES >> GO TO 2
NO >> Repair or replace malfunctioning parts.
2.CHECK UNIFIED METER.
Check unified meter. Refer to See: Instrument Panel, Gauges and Warning Indicators\Testing and Inspection\Initial Inspection and Diagnostic Overview\Work Flow.
>> Inspection End.