c5 abs pump woes

mrlogik · Unread post by **mrlogik** » 28 Apr 2011, 22:11

Im told after some rather pricey diagnostic testing that my abs pump is putting the car into limp mode,beeps on dash with the skid symbol and stop light, apparently its linked to the ecu [sounds bad already] and will cost £500 for a new one.
Questions,can i whip my abs pump off check the part number and get a £40 item off flea bay and live happily ever after,i doubt this highly.
Will it need a lexia to reprogram the new abs pump, this sounds likely for modern cars.
Has anyone got a better suggestion?
Scrap yard suggestions not often found amusing in this forum

Has anyone had the same predicament?

wheeler · Unread post by **wheeler** » 28 Apr 2011, 22:26

Altough anythings possible nowadays I can imagine how the ABS ecu is putting the car into limp home mode ?? How did they come to that conclusion ? if your going to say there was a fault code saying something along the lines of ABS information invalid on the CAN then id get someone else to have a look before shelling out for an ABS unit.
They only need basic programing with Lexia eg tyre size & you can re use a second hand one.

mrlogik · Unread post by **mrlogik** » 28 Apr 2011, 22:51

Apparently the all singing testing machine it was put on cost £8000 pounds!! and the results where due to the wheel speed sensors for abs going faster than the pump or the pump not maintaining enough pressure for wheel speeds. It was throwing up this problem for a while and i assumed abs sensors and so did my local garage there test equipment couldnt find a fault.
I dont mind getting my local guy to remove part and il match the numbers for a s/hand replacement,better check my nearest lexia owner or invest in one myself methinks. thanks wheeler help appreciated.

cachaciero · Unread post by **cachaciero** » 29 Apr 2011, 08:37

I strongly suspect that this is the wrong way round. I cannot envisage any combination of ABS faults that will put the engine into LIMP mode.
However any engine failure that puts the engine into limp mode will cause the ABS to fail. The reason being that the ABS ECU gets engine Torque data from the Engine ECU when the Engine is in LIMP mode this data is no longer valid, the ABS ECU see's this and gives a warning that is basically saying it's performance is degraded.

cachaciero

wheeler · Unread post by **wheeler** » 29 Apr 2011, 17:53

mrlogik wrote:Apparently the all singing testing machine it was put on cost £8000 pounds!!

Doesent matter how much the equipment was you still need someone that can operate it & interprate the info it gives them.
cachaciero is spot on, most engine management faults will also log an ABS/torque fault .

cachaciero · Unread post by **cachaciero** » 30 Apr 2011, 20:11

wheeler wrote:
mrlogik wrote:Apparently the all singing testing machine it was put on cost £8000 pounds!!
Doesent matter how much the equipment was you still need someone that can operate it & interprate the info it gives them.
cachaciero is spot on, most engine management faults will also log an ABS/torque fault .

How true, seems to me that that the former is far more common than the latter

cachaciero