Nissan Altima 2007-2012 Service Manual: 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 SEC-433, "DTC Logic".
• If DTC B2557 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to SEC-434, "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-465, "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".
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:
P0171 fuel injection system function
DTC Logic
DTC DETECTION LOGIC
With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture
ratio can be brought closely to the
theoretical mixture ratio based on the mixture ratio feedback signal from the
A/F sensors 1. The ECM calculates
the necessary compensation to correct th ...
The oil pressure warning lamp does not turn on
Description
The oil pressure warning lamp stays off when the ignition switch is turned
ON.
Diagnosis Procedure
1.CHECK OIL PRESSURE WARNING LAMP
Perform IPDM E/R auto active test. Refer to PCS-14, "Diagnosis Description".
Is oil pressure warning lamp illuminated?
YES >> G ...
Diagnosis system (AV control unit)
Diagnosis Description
DESCRIPTION
• Diagnosis function consists of the self-diagnosis mode performed
automatically and the CONFIRMATION/
ADJUSTMENT mode operated manually.
• Self-diagnosis mode checks for connections between the units constituting this
system, analyzes each individual ...