Herbie:

First, have you pulled the gage and checked the bulb? Maybe there is not one in there. That is what I found with some of my lights. Someone with more expereince will have to help with the troubleshooting beyond this, as I have not looked at the seatbelt wiring (yet).

Also, I have notyet had my car "hammered", so I do not know the cause of my faults yet.

Ron
91 C2 Cabrio
85.5 944 NA

 

Dear Randall,
The clock if removed with power on WILL!!!, 100%, log an airbag fault. If the clock is serviceable. If the clock is removed with power not applied then obviously it will not log a fault. This has been proven a number of times. Again check the maintenance manual and the airbag system maintenance. In fact I helped a 964 Turbo owner who did just this. Removed the clock and replaced it with a boost gauge,
Ciao,
Adrian
911C4

 

Wonderful!

I checked my clock, and the seatbelt light was missing; replaced it with a "CAT" light, that I'd never seen on, and all works fine.

(What is that "CAT" light ? It doesn't come on during the initial check)

Then, I put a new bulb in the "CHECK ENGINE" position; This light now comes on until the engine starts, then goes off. Wonderful! I think it is lighted by the DME, to signal engine fault, isn't it ?

Thanks for all your hints. Step by step I'm getting a perfectly working car.

 

Dear Herbie,
You will have to check to see if the engine check light actually works by activating it using the accelerator. The instructions are found on a number of threads already. Whether it works or not depends on the software installed in your DME. If you have a late 1991 ROW version you may have the correct DME part nunber installed. This feature was not enabled for ROWs only the USA,
Ciao,
Adrian
911C4

 

OK, Adrian, my check engine light seems to work.

After depressing the acceleretor, with the key in "3" position, the light makes a short lamp followed by 5, then a pause, a long lamp, and so on.

In previous threads, it's an "OK" code, I believe.

And what about the "cat" light ?

Thanks

 

Dear Herbie,
You have a flashing code 1500 which means no faults recorded. This is good. The code for an O2 sensor failure is 1124. There are other codes stored in the DME as well. 1141 tells you that you have an aftermarket chip installed, unless the supplier of the chip has managed to sort this out in their programming. Most do not,
Ciao,
Adrian
911C4

 

My gong never sounds when my lights are left on etc. Can I easily check the connection by removing the dial from the dash or is the gong connection hidden deep in the bowels??

It may seem petty but I have a habit of leaving lights on in past cars, I don't want a flat bettery.

Thanks

 

Adrian:

I have a 1990 C4 Cab (USA), it was made in May1990. Do you think if I place a bulb in the as new factory vacant "check engine" socket that the light will provide me with DME fault flashing codes ? My DMe "brain" number is 911-618-124-04.

Thanks,

Patrick

 

Dear Patrick,
From the data I have the answer is "maybe but I do not think so". I cannot pin down the exact DME part number that the 9268 tester software was installed into the DME (Bosch 2.1). I believe it was the 964-XXX-XXX-01. However it would be good to try. At least it would prove something one way or the other. You were unlucky actually to miss out on the -01.
Ciao,
Adrian
911C4

 

Adrian:

I was at a Porcshe shop last week and he had a client's 1990 C2 DMe "brain" out and I ck'd the part number and it was a "964----01".

Funny how that C2 1990 had the "964---01" DMe brain and my 1990 C4 lacks the "964---01". The factory must have made the change during the 1990 production run ? Maybe Porcshe made the change to the newer DMe brain for USA Calif reasons ?

Patrick

 

Here is an update:

Well, I have just finished my first round of PM at the dealer shop. I had the card "Hammered", and the faults reset. Wouldn't you know it, the airbag light came back on. When speaking with the service manager, he has told me that it is a bad clock. I also found out that a new clock costs $550. I asked if this was just an annoyance, and if the airbag system would still work, and I was told yes. So I am forgoing a new clock for the time being.

Seocnd, I found out that my oil leak is where the cylinders bolt to the block. Given that it is a drop of two of oil after I drive it, I will live with this for now.

The real funny thing that was found was that the colling fan belt tensioner had been removed, and wired around. But I was told that if I watch the gage, and check the belt tension and condition fairly regularly, I should be ok. So the next service I will have this fixed.

And now the valves are adjusted.

Ron

1991 C2 Cabriolet
85.5 944 NA

 

Hi,
Wow - you guys really get stung for Porsche parts over there don't you? I had a new clock for my C4 to fix warning light problems and it cost me £139 (about $200?).

Mind you I remember being told that C2 / C4 part numbers were different for the clock - perhaps C2s get the really expensive version!

Dave
90 C4

 

On a closely related issue...

My 91 C4 is in the garage at the moment, as we are trying to track down the reason for the warning light for the brakes and the warning buzzer coming on when braking. This only happens intermittently, and we have checked brake fliud level, brake pads and so on. There is no change in braking performance, but it is really beginning to bug me not being able to get to the root of the problem!

Anyone got any ideas?

 

Hi Ron,

DaveK is right .... the clock should only be about $160, even here in the U.S. I imagine you should be able to pick it up even cheaper if purchased through a discount dealer such as Hendrick or Sunset Porsche.

 

Brad,
Which brake warning light comes on? Is it ABS, fluid level or pad sensors (or all 3)?

I know that the buzzer doesn't sound just for worn pads. I suspect it doesn't sound for fluid level but would need to check the handbook. I know it does sound for ABS / AWD warning lights - is it these coming on?

Dave
90 C4