Test Cycle

A test program runs in the control unit when ignition is switched "ON". Another test program runs at a road speed of 3 MPH. Testing at 3 MPH can be felt, since pump in hydraulic unit will run briefly. Test cycle repeats each time vehicle accelerates. Testing includes the following:

• Electronic control unit.
• Hydraulic unit.
• Speed sensors.
• Relays and wire harness.

Fig 1: Porsche ABS Circuit Diagram

Courtesy of PORSCHE OF NORTH AMERICA, INC.