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Discussion Starter #1 (Edited)
Morning all,

I have narrowed down my cruise control fault to the braking system , but need someone who know s more than me to shed some light on the problem .
I am getting the engine light on, VDC ASR and Hillholder , no cruise control , Unavailable and the fuel gauge dropping to zero when the fault occurs.

its showing a P0564 (multi function input circuit 'A')

i have changed the brake and clutch switch and they are working fine .

the fault occurs when you press the brake pedal and hold it about half way for more than 3 or 4 seconds. all the warings come up and the fuel gauge drops to zero.
the fault clears if you apply more OR less pressure to the brake pedal.

i have even disconnected the brake pedal wiring so as to rule the pedal switch out and the fault still triggers.!!!

this must mean that it to do with the braking or abs system its self .

does anyone know what it could possibly be ?

help urgently required please


or can someone recommend any one who would be able to get to the bottom of this issue. its already been to the main dealer and they are useless, and an auto electrician and my local specialist . Wopuld it be worth a trip to AutoLusso ? are they any good?

im in southampton by the way ;)


martyn
 

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i am no expert at all and it's probably not related in the slightest but my MAF sensor has gone so I unplugged it - apart from the lumpy tickover the only other thing that has happened is the cruise has stopped working!!

I'm sure someone will tell you it isn't related but a thought anyway!!
 

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Discussion Starter #3
hi , yes you will loose cruise with no maf . i had a new maf last month from alfa , mine still does it but only when the brake is pushed

thansk for replying though ;)
 

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isn't there a pressure sensor either below the master cilinder or in the ABS unit? if you have Multi ECU SCAN you could look for a brake pressure reading.

did you follow the wiring for the brake light switch to see if it's rubbing anywhere?

do you have the electrical diagrams for your car, esp the ones for the fuel gauge (tank aswell as dashboard). does the trip computer also reduce the remaining miles for the current fill?
 

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Discussion Starter #5
isn't there a pressure sensor either below the master cilinder or in the ABS unit? if you have Multi ECU SCAN you could look for a brake pressure reading.

did you follow the wiring for the brake light switch to see if it's rubbing anywhere?

do you have the electrical diagrams for your car, esp the ones for the fuel gauge (tank aswell as dashboard). does the trip computer also reduce the remaining miles for the current fill?
morning ,

i will have a look to see if there is a brake pressure sensor, tbh i don t know alot about braking systems. i have checked the wires to the rake pedals switches and they look ok , but as i said the fault occurs when the wires are disconnected . i have been told that it is probably the abs ecu that has gone up the spout . don t know how i can check that . and my car is nt going in to him till september as he s on holiday . how would i go about checking the abs ecu?
 

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Unplug and clean the big plug and socket at the ABS valve block, other than that I fear its big money.....and an odd fault.
 

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Discussion Starter #7
ill give it a go . a used abs unit is only £250 so it might not be too bad hopefully, are they prone to failing though? theres not much on here about it ?
 

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Discussion Starter #9
mmm , well i have noticed that even though my car has been services every 5-7000 miles that the brake fluid looks like thin brown water . i would have thought it would have been changed at some point though . so it is possible that it could have buggered something then ?
 

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Discussion Starter #11
if fixed the fault today after 10 months 4 garages and £1200

i set the fault off and then wiggled all the looms under the dash by the drivers door and fault doiagnosis socket . suddenly the fault cleared and everything went back to normal .

so to conclude its either a snapped wire or a dodgy connection to one of the connectors

thanks for all your help everyone .
....bloody alfa s!!! ;P
 
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