Nissan Altima 2007-2012 Service Manual: Can communication

System Description

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.

Each control unit transmits/receives data but selectively reads required data only.

Refer to LAN-25, "CAN Communication Signal Chart", about CAN communication for detail.

    Automatic speed control device (ASCD)
    System Diagram System Description INPUT/OUTPUT SIGNAL CHART *: This signal is sent to the ECM via the CAN communication line BASIC ASCD SYSTEM Refer to Owner's Manual for ASCD operating inst ...

    Cooling fan control
    System Diagram System Description INPUT/OUTPUT SIGNAL CHART *1: The ECM determines the start signal status by the signals of engine speed and battery voltage. *2: This signal is sent to EC ...

    Other materials:

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    Description Detects door open/close condition. Component Function Check 1.CHECK FUNCTION Check door switches DOOR SW-DR, DOOR SW-AS in Data Monitor mode with CONSULT-III. Is the inspection result normal? YES >> Door switch is OK. NO >> Refer to RF-17, "Diagnosis Proc ...

    B2109 steering lock relay
    Description The steering lock relay ON signal is transmitted to IPDM E/R by BCM via CAN communication. IPDM E/R turns the steering lock relay ON and transmits the release of the steering to BCM. DTC Logic DTC DETECTION LOGIC NOTE: • If DTC B2109 is displayed with DTC U1000, first per ...

    CVT fluid
    Inspection CHECKING CVT FLUID Fluid level should be checked with the fluid warmed up to 50° to 80°C (122° to 176°F). The fluid level check procedure is as follows: 1. Check for fluid leakage. 2. With the engine warmed up, drive the vehicle in an urban area. When ambient temperature ...