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Thread: Road speed sensor ABS wiring diagram

  1. #1
    Join Date
    Nov 2007
    Posts
    10

    Default Road speed sensor ABS wiring diagram

    Still having problems with speed omitted do any have a wiring diagram of the ABS system I would like to do a continuity check on the sensors, Wheel and speed sensor on the engine before I replace them and then find out itís the ABS unit any one help.

  2. #2
    Join Date
    Nov 2007
    Posts
    10

    Default Sorry its a 1999 v40 est

    Still having problems with speed omitted do any have a wiring diagram of the ABS system I would like to do a continuity check on the sensors, Wheel and speed sensor on the engine before I replace them and then find out itís the ABS unit any one help. volvo V40 1999

  3. #3
    Join Date
    Oct 2007
    Location
    Middlesex
    Posts
    8,509

    Default

    I don't specifically know about Volvo, but most manufacturers use similar types of sensors, in which case resistance testing is only half the job. They are probably AC generators as well. In which case you may well get the right resistance reading, but misalignment, dirt and bits of metallic road grit will cause them not to put out the right AC voltage signal to ECU. You will most likely need to know the output parameters as well. Worth trying local Volvo workshops?

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