Pressure modulation valve ABS error

Discussion in 'Volvo Forum' started by volvoworld, Jan 14, 2014.

  1. volvoworld

    volvoworld Bobtail Member

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    Jan 14, 2014
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    Can anybody help me out with ABS problem on Volvo FH12 2004

    Pressure modulation valve ABS axle 1 left and right communication error
    MID 136
    SID 7 and 8
    FMI 2

    How can I troubleshoot this?
     
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  3. jason6541

    jason6541 Road Train Member

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    Have you checked electrical connection at the valves?. Pulled electrical connectors checked for corrosion on the pins?. Corrosion in the connectors. Is the wiring intact not cut ar broken wire. I ask because i've had similar codes in a different trk and electrical connectors were corroded. Cleaned them up put some dielectric grease in connectors. Pulled battery cables for about 10 min and codes never came back.
     
  4. volvoworld

    volvoworld Bobtail Member

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    Jan 14, 2014
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    Do you mean electral connectors to the valves or to the ECU because this error are active on both Left and Right axle.
     
  5. jason6541

    jason6541 Road Train Member

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    Valves mounted on frame rail. Not sure which system you have 2 channel,4 channel. Not familiar with your trk but generally abs systems same from trk to trk, limited manufacturers
     
  6. Pablo-UA

    Pablo-UA Road Train Member

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    I sugest he got early EBS system, so things are different a bit.

    ABS sensors are not connected to MID 136 unit, they are connected to EBS modulator and it sends data to EBS central computer by Brake CAN

    So I'd start with vehicle identification
     
  7. volvoworld

    volvoworld Bobtail Member

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    Jan 14, 2014
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    Thanks guys for all response, Vin number for this truck YV2A4CEDX4A586539 if that helps.

    I don´t know where I should start to troubleshoot.
     
  8. Pablo-UA

    Pablo-UA Road Train Member

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    looks like a wiring problem. Front axle modulator valve power supply broken.... usually under cab
     
  9. volvoworld

    volvoworld Bobtail Member

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    Thanks Pablo for quick reply, do you have any diagram for this system.
     
  10. gogy123

    gogy123 Bobtail Member

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    Aug 7, 2014
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    Hi guys. I am new to the site but have a similar problem with a 2002 FM rigid lorry. Code mid 136 sid 9 fmi 9 appeared recently and brake ECU failure is showing on screen. Does the pressure modulation valve need replacing or is it wiring? I have checked connections from sensors to valve with no obvious issues evident. Any help greatly appreciated!
     
  11. Pablo-UA

    Pablo-UA Road Train Member

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    rear axle left abs modulator failure
     
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