Possible causes, elimination, notes

The ABS/TC control module does not receive any speed information (rpm signal) from the DME control module (No. 2). The rpm signal is checked with the Porsche System Tester 2 via the Actual values menu.

• Check the rpm signal (indication of the current engine speed) via the Actual values menu with the engine running.

  Then select the DME system and also check the rpm signal there via the Actual values menu. If the signal is present in the DME system but not in the ABS/TC system, the fault lies in the wiring between the ABS/TC control module and the DME control module.

• Check the wiring (wire, connectors on the control modules) (PIN 30 on the ABS/TC control module and PIN 80 on the DME control module).