PDK Diagnosis information

This page is a work in progress. More information will be provided over time.

These pages contain information that has been accumulated over the years when working with individuals and workshops through their PDK problems. It is only relevant for the 911 (7 speed PDK), Boxster or Cayman platforms.

I’ve done the best job I can of testing and checking all of the information provided, but due to the nature of PDK problems I clearly can’t guarantee that this information will work for you for every circumstance. You also might notice that some of the information provided contradicts fault information in the Porsche official documents. This is due to experience showing that the Porsche documents aren’t always correct.

It is important that you spend time understanding the information provided here and elsewhere, and then diagnose accurately for the best outcome.

Below is the relevant portion of the wiring diagram with mark-ups that make it simpler to understand each part. This is from the 981 Boxster wiring diagram. For other models the wire colours might differ but the pinouts should be correct. It doesn’t include the pinouts for the 911 active differential. Please refer to the wiring diagram of the model in question prior to conducting tests.

The TCU is located at the left of the rear luggage compartment in the Boxster or Cayman. For the 911 the TCU is located under the right rear seat.

All sensors are on the plug with the grey shroud at the TCU. The grey shroud can be easily removed so you can then reinsert the individual plug housings into the TCU for back probing and sensor testing.  This is for testing of sensor outputs when connected to the TCU and operating.

If you are testing sensor resistances, ensure you have the plug removed from the TCU so you aren’t testing the sensor resistances as well as the TCU at the same time.