Hi anybody had any issues with the orange ABS warning light coming on after a brake fluid

[colinjhaffenden]

Hi anybody had any issues with the orange ABS warning light coming on after a brake fluid change

 

[colinjhaffenden]

Hi anybody had any issues with the orange ABS warning light coming on after a brake fluid change

 

[colinjhaffenden]

Maurice

It has started since a fluid change, (professional) I am told it is fault 40

Regards

Colin

p.S. C4

 

[Mark Elder]

Is it orange or red? I thought (can't check, car not here) the only orange one was the brake pad wear indicator.

Anyway the ABS light that's not the green one (on C4): I've had this come on immediately after a service because of fiddling about around the wheels that causes an ABS sensor to give up on life. They don't last forever. I've had 2 or 3 of them replaced in the last 14 years/70k miles.

I think there is a good chance that it was not the change of brake fluid that caused it but something else done at the same time.

Although I guess poor bleeding of the ABS pump might cause it (but would that not been one of the other brake warning lights?)

 

[Hacki]

Have you had the engine running for a while? ABS light is the first to come on when you have low voltage. So, it might just disappear.

 

[colinjhaffenden]

Just comes on intermittently, is stored with a trickle charger so shouldn't be that, thanks

 

[Motorhead]

Colin,

Just to say that looking online, it seems that code 40 is emissions-related, i.e cat converter or lambda sensor, which seems very odd?

Maybe an ABS sensor or connection was knocked or damaged when the brakes were bled? Since the problem's intermittent, I'd be inclined to remake any connections if you can to ensure continuity.

Jeff

 

[colinjhaffenden]

Maurice I have driven the car to the MOT station and all was well on the way, however when they got in it to put it on the ramp the ABS lamp came on, then it got worse and the ABS orange light came on along with the ABD lamp, However the lights only come on when you actually start to move, both lights stay out until you start to move, so i think i will take the wheels off and just check each speed sensor to see if there is any corrosion present.

Regards and thanks, will let you know what i find.

Colin

 

[colinjhaffenden]

Maurice

the red ABS light,(6) is slow to go out on start up but when out stays out. when rolling forward, (not backwards), the orange ABD light (7) and red ABS light (3) come on, problem started with just the (7) light

The MOT tester checked the fluid level and said it looked a little dirty for new, and wondered if the service garage, (a well known Porsche dealer in the South West) had also changed / bled the booster fluid, (he used to work for Porsche it appears)

Regards

Colin

 

[colt]

In my experience, by far the most common reason for random abs system failure and warning lamp illumination is heavy corrosion of the front and rear alloy wheel carriers that the abs sensors are fitted into. The corrosion literally crushes the sensors in their housing , then they short circuit inside and the abs or abs/abd Ecu registers the wheel speed anomaly , often it doesn’t realise there is a problem until you move off as certain self checks and abs component tests are performed by the abs ecu at ignition on and engine start ,the last being speed sensor plausibility and output upon moving off from rest. A porsche Fault code reader will identify which ones are failing . You will not be able to remove the originals without destroying them, I usually have to knock the top off of them and then remove the rest by drilling the soft plastic housing . When thats removed , i clean and dress the aperture so that the new sensor is an easy fit in the hole and then apply anti seize paste to the new sensor exterior... the 5mm Allen key(M6) sensor retaining bolt that also locates the earth shield wire also can be difficult to remove and often shear, recourse to drill and tap as it’s under no stress , often welding a nut on the remains of the bolt will thermally shock it enough to remove cleanly, with patience and skill.

regards,Christian .....

 

[colinjhaffenden]

Christian, thanks for this and I suspect you are right especially as due to the lack of use over the last months prior to its trip to the garage for the service and fluid change I am comingto the same conclusion, I think a trip to a specialist may be in view.

Regards

Colin

 

[colinjhaffenden]

Thanks for all the various ideas / hints it would appear that the clue was in the garage report from who did the fluid change, "relay open circuit Fault 40". (the relay had failed).

Took it too SCS Porsche Honiton and diagnosed and replaced for less than £200. Result

Regards

Colin

 

[colinjhaffenden]

Thanks for all the various ideas / hints it would appear that the clue was in the garage report from who did the fluid change, "relay open circuit Fault 40". (the relay had failed). Took it too SCS Porsche Honiton and diagnosed and replaced for less than £200. Result Regards Colin

 

[Graham-S]

Glad its fixed Colin and a fairly easy fix in the end of this long diagnostic process

Now to drive it

Graham

 

[Johnny C]

I used to have this on my old 3.2. Had sensors changed but made no difference. Turned out in the end a certain 1 man band 'Porsche specialist' had bent some of the metal bits on the wheel that the sensor read. It looked like he'd stuck a screwdriver in and bent it. He'd completely bodged the brakes which I'd had sorted, but hadn't realise he'd also knackered the ABS.