Nissan Altima 2007-2012 Service Manual: 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 SEC-36, "DTC Logic".

• If DTC B2557 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to SEC-37, "DTC Logic".

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 SEC-74, "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 BRC-51, "DTC No. Index" (ABS), BRC-121, "DTC No. Index" (TCS/ABS) or BRC-223, "DTC No. Index" (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 MWI-4, "Work Flow".

>> Inspection End.

    B2556 push-button ignition switch
    Description The switch that changes the power supply position. BCM maintains the power supply position status. BCM changes the power supply position with the operation of the push-button ignition ...

    B2560 starter control relay
    Description Starter control relay, integrated in IPDM E/R, permits the starter relay operation when in N or P position and the steering is locked or unlocked. It is installed in parallel with the ...

    Other materials:

    P1777 step motor
    Description The step motor changes the step with turning 4 coils ON/OFF according to the signal from TCM. As a result, the flow of line pressure to primary pulley is changed and pulley ratio is controlled. DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE CAUTION: Always drive ...

    Rear power window switch
    Description • BCM supplies power. • Rear power window motor will be operated if rear power window switch is operated. Rear power window switch.  Component Function Check Rear Power Window Switch 1. CHECK REAR POWER WINDOW MOTOR FUNCTION Does rear power window motor operate with ...

    Front washer nozzle
     Removal and Installation REMOVAL 1. Remove the cowl top cover For Sedan Refer to EXT-39, "Removal and Installation". For Coupe Refer to EXT-18, "Removal and Installation" 2. Push washer nozzle tab (A), to release the washer nozzle (1) from the cowl top cover, then di ...