B2557

B2557 VEHICLE SPEED

Description

BCM receives the 2 vehicle speed signals via CAN communication. 1 signal is transmitted by the "unified meter and A/C amp." 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 "BCM : DTC Logic" Security System.
- If DTC B2557 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to "BCM : DTC Logic" Security System.






DTC CONFIRMATION PROCEDURE


1. PERFORM DTC CONFIRMATION PROCEDURE

1.Drive the vehicle at the vehicle speed of 10 km/h (6.2 MPH) or more and wait for at least 10 seconds.
2.Check "Self diagnostic result" with CONSULT.
Is DTC detected?
YES- Go 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. Refer to "DTC No. Index" Testing and Inspection.
Is the inspection result normal?
YES- GO TO 2.
NO- Repair or replace the malfunctioning parts.

2. CHECK DTC WITH "UNIFIED METER AND A/C AMP."

Check "Self diagnostic result" with CONSULT. Refer to "DTC Index" Testing and Inspection.
Is the inspection result normal?
YES- GO TO 3.
NO- Repair or replace the malfunctioning parts.

3. CHECK INTERMITTENT INCIDENT

Refer to "Intermittent Incident" Intermittent Incident.
- INSPECTION END