Shark Shoes & tire pressure query?
09-26-2002, 02:50 PM
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Shark Shoes & tire pressure query?
Pulled the trigger & picked up 17" tech twist/Kuhmos pack...from DR's 928 Specialists...(nice guy) ...do I need to do anything regarding the Tire Pressure Warning System? DR mentioned something, but I was in a loud & noisy airport & couldn't hear him...so I went to his tips page & he has a bypass the warning system page...I kinda want to leave it intact if possible...do I have to do anything special when installing the new shoes? or does it auto detect the new tires? thanks <img src="graemlins/crying.gif" border="0" alt="[crying]" />
09-26-2002, 06:15 PM
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The RDK (tire pressure warning) system looks for the passing of those sensors that are mounted in the wheel itself. Look at the old wheels and you'll see the patches on the wheel. There's a 'receiver' that they go past when the car is rolling, and when there is sufficient tire pressure the sensor tells the receiver that everything is OK. The system looks at the pulses from the ABS sensors to detect that the car is moving.
So, when you mount new wheels without RDK, the RDK controller starts looking for the sensors whenever the car is rolling. Since your car won't have the sensors on the new wheels, the controller will think that all your tires have low pressure, and set the dash alarm for you. This weill happen every time you drive the car, and will be very annoying!
Follow the instructions you referenced to get the RDK disabled. Do this BEFORE you swap the new tires and wheels on, and therefore BEFORE you set the RDK alarm with the new wheels.
<img src="graemlins/yltype.gif" border="0" alt="[typing]" />
So, when you mount new wheels without RDK, the RDK controller starts looking for the sensors whenever the car is rolling. Since your car won't have the sensors on the new wheels, the controller will think that all your tires have low pressure, and set the dash alarm for you. This weill happen every time you drive the car, and will be very annoying!
Follow the instructions you referenced to get the RDK disabled. Do this BEFORE you swap the new tires and wheels on, and therefore BEFORE you set the RDK alarm with the new wheels.
<img src="graemlins/yltype.gif" border="0" alt="[typing]" />
09-27-2002, 02:37 PM
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thanks Dr Bob...so once you buy new tires/wheels, there is no way to use the RDK system? ...also, DR mentions "place a jumper wire to pin 13 to 2" what is that? & where do I get one? Do I need a connectors? thanks! 
09-27-2002, 02:45 PM
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Starting in 1989, Porsche added a tire pressure monitoring system, called PDK. It was not a popular system, and was discontinued a few years later. The system was overly sensitive, and most people didn't want to add the (expensive) sensors to aftermarket wheels. In order to get rid of the constant warnings, it is common to disconnect the system.
The RDK unit is below/under the dashboard on the drivers side, above the clutch pedal (or where it would be on autos). You don't have to remove any access panels or the dash to get at it. The part number on the unit is 928 618 150 01 (or 00).
Disconnect the battery ground strap before starting the bypass procedure. This is for safety and will also clear any RDK faults while you are doing the bypass.
Disconnect the connector from the RDK unit, and then place a jumper from pin 13 to 2 on the connector. Tape up the connector to hold the jumper in place and keep the connector clean. You can also open up the connector and put the jumper inside the connector.
Use some plastic wire ties to secure the connector back up under the dash,
DO NOT try to plug the connector back in the RDK control unit. The Control Unit can also be removed very easily if desired by removing the 2 Phillips-head mounting screws.
The RDK unit is below/under the dashboard on the drivers side, above the clutch pedal (or where it would be on autos). You don't have to remove any access panels or the dash to get at it. The part number on the unit is 928 618 150 01 (or 00).
Disconnect the battery ground strap before starting the bypass procedure. This is for safety and will also clear any RDK faults while you are doing the bypass.
Disconnect the connector from the RDK unit, and then place a jumper from pin 13 to 2 on the connector. Tape up the connector to hold the jumper in place and keep the connector clean. You can also open up the connector and put the jumper inside the connector.
Use some plastic wire ties to secure the connector back up under the dash,
DO NOT try to plug the connector back in the RDK control unit. The Control Unit can also be removed very easily if desired by removing the 2 Phillips-head mounting screws.
