Nissan Maxima Service and Repair Manual: B2557 vehicle speed
BCM receives the 2 vehicle speed signals via CAN communication. One signal is transmitted by the "combination meter". Another signal is transmitted by "ABS actuator and electric unit (control unit)". BCM compares both signals to detect the vehicle speed.
DTC DETECTION LOGIC
If DTC B2557 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to SEC-29, "DTC Logic".
If DTC B2557 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to SEC-30, "DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
Drive the vehicle at the vehicle speed of 10 km/h or more and wait for at least 10 seconds.
Check "Self Diagnostic Result" with CONSULT.
1.CHECK DTC WITH "ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)"
Check "Self Diagnostic Result" with CONSULT. Refer to BRC-82, "DTC No. Index".
2.CHECK COMBINATION METER.
Check combination meter. Refer to MWI-4, "Work Flow".