Romanoaf

Hi all, new 964 owner here, my first porsche (1990 911 C4). Coming from a SAAB background.

Purchased the car with a PDAS/ABS fault on full time (not intermittent), I've read most of the threads concerning this issues and figured my best course of action would be to have the faults read. Purchased the durametric cables, I can read all other systems except for the ABS/PDAS won't connect. Is this usually caused by a faulty ABS Brain/module? Can this issue be caused by a faulty relay 34?

Any advice is greatly appreciated.

ToreB

I've seen several cases of corroded ABS control unit connectors. It's placed in the bottom of the trunk, with the connector faced upvards. Water leak in and the pins corrode. That may be the culprit.
Cheers,
Tore

Romanoaf

Is there an obvious way to check for a faulty control unit? Althought there is a bit of water spotting on the unit, the connectors look fairly clean on both module and harness.
Thanks,
Roman

ToreB

I guess an OBD reading would be the best way to check the unit. I have not seen any water leaking into the unit itself, but leaking through the seals in the connector, causing corrosion on the pins that protrude from the ABS unit as well as on the harness. That would be easy to spot, and I guees you are lucky to not have that problem then.
Cheers,
Tore

Romanoaf

Thanks for the comments Tore, that brings me back to my original question. The durametric will not connect to the ABS/PDAS, gives me a communication error. Is this the fault of the durametric scan tool, or the module?

The dealer here in London Ontario doesn't have an opperating Bosch Hammer at the moment. Does anybody know of a "Good" aircooled specialist in SW Ontario where I could have this scanned and the system bled?

Thanks,
Roman

Sharker

I am in London, and have used http://www.rspmotorsports.com/. They are just out of town in Komoka. My car is in storage there right now. They have treated me well and have a lot of aircooled experience. Tell them Jeff Feltham sent you.

We will have to get together if we make it through the storm on Friday

KaiB

I can tell you that during my ABS issues, my Durametric would never recognize the ABS system.

We actually never did find the fault; it "corrected" itself as the wiring loom was stripped and redone during the race build. One can only assume the fault was a connection or mechanical (w/the wiring, loom, relay seat, ad naseum) - but regardless, I wasted money purchasing the Durametric.

napaul

hi , i too have the durametric cables and i am able to read the fault codes off my abs/pdas module.One thing i did realize though is battery voltage must be up to par and car not running.so if your battery is fully charged, just turn the ignition key over to the run position without starting and access the abs/pdas module first i have had no issues..make sure you update your durametric to vs 6 i have found it to work quite well.

Romanoaf

Thanks guys, I'll try charging the battery tonight as I did have issues with the Christmas tree effect when the weather was cold out.

Romanoaf

Thanks Sharker, I've been weary of RSP. I haven't heard good reviews about them in person, and doing a search on here, seems a few people have had some major issues with them. But if they have the correct test equipment, could be worth the visit.

Sharker

Yep, there have been some stories.. I have had no issues, and have seen a ton of very high end cars being worked on in there.

Turbohead

I have this unit if you need it
Elliot

power_up

Is this hydraulic unit is same in C2 and C4?

ToreB

Just to be sure: Charging your battery will probably not help on the Christmas Tree Effect. The cause is often reported to be degraded insulation on the high voltage ignition cables. Sparks in the engine compartment will cause hiccups in the Motronic engine control, thus the rush of warning lights.
Cheers,
Tore

Romanoaf

Thanks Tore. That's what I thought it could be, what led me to believe that it was battery related was that it only happened when it was freezing out, and only when I used something that pulled current, like it would happen when all accessories were on and I turned on the heated seats. Could just be coincidence, but if it happens again, I'll be replacing coils and wires