Control Unit (Cu): Memories

The memory bank of the CU is programmed with specific information which is used by the CU during open loop (spark timing and fuel injection rate). This information is also used when a sensor or other component fails in the system, allowing the vehicle to be driven in for repairs.

On 944-S models, trouble code(s) can be called from the CU fault memory with a special diagnostic Tester (9268), which can be connected to a diagnostic terminal provided on the DME control unit wiring harness. Fault/trouble codes are then activated and read through the diagnostic tester.