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    Re: Land Rover Freelander 2.5V6 2003 ABS Archived Message

    Posted by Dave Harney on November 6, 2008, 3:00 pm, in reply to "Land Rover Freelander 2.5V6 2003 ABS"

    Hi Russ,

    From 2002 MY
    An active ABS sensor is installed in each of the four wheel hub carriers to provide the ABS ECU with a speed signal from each road wheel. Each of the ABS sensors is positioned in close proximity to the inboard seal of the related wheel bearing and secured with a bolt. The seals, which rotate with the wheels, each contain a magnetic element incorporating 48 pole pairs.
    The ABS sensors operate using the Hall effect principle. A permanent magnet inside the sensor applies a magnetic flux to a semiconductor, which receives a power supply from the ABS ECU. When the wheels rotate, the pole pairs in the seals induce voltage fluctuations in the ABS sensors that are converted into square wave signals and output to the ABS ECU. The frequency of the signal is proportional to wheel speed.
    Since the sensors are active devices, an output is available when the road wheels are not turning, which enables the ABS ECU to check the sensor while the vehicle is stationary.
    All ABS Sensors
    Failures or malfunctions relating to the ABS sensors and connections are detected by the ABS ECU. In the event of failure of two or more of the ABS sensors the ABS ECU switches off the system and illuminates the ABS, TC, EBD, and HDC warning lamps.
    If a single sensor fails the ABS ECU maintains the minimum functions to provide safe operation and illuminates the ABS, TC, and HDC warning lamps.

    Pin No. Description Input/Output
    1 Battery power supply (for return pump) Input
    2 Diagnostic ISO 9141 K line Input/Output
    3 Not used –
    4 Ignition power supply Input
    5 Not used –
    6 HDC switch Input
    7 and 8 Not used –
    9 Brake fluid level switch Input
    10 Not used –
    11 CAN bus 1 high (connection with instrument pack) Input/Output
    12 Not used –
    13 CAN bus 2 low (connection with ECM/EAT ECU) Input/Output
    14 Not used –
    15 CAN bus 1 low (connection with instrument pack) Input/Output
    16 System earth –
    17 to 23 Not used –
    24 Accelerometer earth –
    25 Not used –
    26 Accelerometer supply Output
    27 to 31 Not used –
    32 Battery power supply (for solenoid valves) Input
    33 Front RH ABS sensor earth –
    34 Front RH ABS sensor signal Input
    35 HDC relay coil Output
    36 Rear LH ABS sensor signal Input
    37 Rear LH ABS sensor earth –
    38 Brake switch (BLS contacts) Input
    39 Road speed signal Output
    40 Accelerometer signal Input
    41 Brake switch (BTS contacts) Input
    42 Rear RH ABS sensor earth –
    43 Rear RH ABS sensor signal Input
    44 CAN bus 2 high (connection with ECM/EAT ECU) Input/Output
    45 Front LH ABS sensor signal Input
    46 Front LH ABS sensor earth –
    47 System earth –

    1 NK
    2 K
    4 WL
    6 PS
    9 BW
    11 YB
    13 YN
    15 YN
    16 B
    24 U
    26 Y
    32 NR
    33 YB
    34 Y
    35 BR
    36 G
    37 GB
    38 GP
    39 WO
    40 R
    41 GR
    42 WB
    43 W
    44 YB
    45 R
    46 RB
    47 B

    Code Colour
    B Black
    G Green
    K Pink
    LG Light green
    N Brown
    O Orange
    P Purple
    R Red
    S Slate (Grey)
    U Blue
    W White
    Y Yellow


    Regards
    Dave

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