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Engine Controls - Fault Code for Hall Effect Sensor Set

Group
2



Number
9205



Model
968



Part Identifier
2470

December 10, 1992

Subject:
968 DME Control Unit



ATTENTION:
Service Manager/Service Technician

Models Affected:
968 Model Year 1992 (N) and 1993 (P)

Concern:
Fault code for hall sensor signal short to ground stored in memory.

General Information:
This fault can occur in 1992 968's and some 1993 968's on those rare occasions when the engine is rotated backwards while the DME is activated (such as pulling away from a stop on an incline and stalling the engine). In such cases, the engine may rotate backwards briefly causing the above mentioned fault to register in the DME memory. If this has occurred, the rpm's at the time of the fault will read < 700/1 min.

Repair Information:
If this fault occurs, it should be erased and the car should be test driven and checked for a reoccurring fault. If the fault returns periodically, the DME control unit should be replaced. If no fault code reappears, the fault is to be considered normal operation; the replacement DME has new software which will prevent the above mentioned condition from occurring. The new DME carries the same Porsche part number as the original and is the only one available.

Parts Information:





DME control units with new software are identifiable by the bar code numbers on the topside of the DME housing beginning with bar code number 26SA2491 and are installed in production as of September 8, 1992 in 968 cars beginning with VIN:

96X PS 82 0198 Coupe
96X PS 84 0143 Cabriolet