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?
Pressure modulation valve ABS error
Discussion in 'Volvo Forum' started by volvoworld, Jan 14, 2014.
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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.
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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.
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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
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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 -
Thanks guys for all response, Vin number for this truck YV2A4CEDX4A586539 if that helps.
I don´t know where I should start to troubleshoot. -
looks like a wiring problem. Front axle modulator valve power supply broken.... usually under cab
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Thanks Pablo for quick reply, do you have any diagram for this system.
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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!
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rear axle left abs modulator failure
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