"944" DME Relay
According to the date code on the relay casing, this is the original relay that came with the car when it was manufactured back in 1995.
The relay performed flawlessly in the time I've owned this 993 and failed shortly after removing the relay from the fuse & relay board. The relay was removed in order to pre-lube the engine after a long winter layaway. This enables the starter to crank the engine over thereby building up oil pressure while disabling the fuel injection circuit.
Removing the relay from its socket in the fuse & relay board was enough to cause a failure of an already weak cold solder joint on the printed circuit board.
Having examined my sixteen year old relay (72,470 km - 45,040 mi), there really isn't any reason these should fail.
The two sets of contacts were in perfect condition as viewed under a microscope in my lab.
The single semiconductor, a rectifying diode on the board, is highly unlikely to fail. The same applies to the coils used as electro-magnets.
This leaves the solder joints; usually the cause of any electrical problems.
Read MoreThe relay performed flawlessly in the time I've owned this 993 and failed shortly after removing the relay from the fuse & relay board. The relay was removed in order to pre-lube the engine after a long winter layaway. This enables the starter to crank the engine over thereby building up oil pressure while disabling the fuel injection circuit.
Removing the relay from its socket in the fuse & relay board was enough to cause a failure of an already weak cold solder joint on the printed circuit board.
Having examined my sixteen year old relay (72,470 km - 45,040 mi), there really isn't any reason these should fail.
The two sets of contacts were in perfect condition as viewed under a microscope in my lab.
The single semiconductor, a rectifying diode on the board, is highly unlikely to fail. The same applies to the coils used as electro-magnets.
This leaves the solder joints; usually the cause of any electrical problems.
