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Radio Noise Filter Transmission Electronic Control Unit
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The jpg shows part number LR020488, a noise suppression capacitor located underneath on a bracket on the right side of the transmission forward of the selector shaft lever. The suppressor is connected to the transmission wiring harness and prevents solenoid operating noise affecting the audio system.
Failure of the capacitor is most often discovered as a result of either black smoke from below and or the blowing of 10 amp fuse F30E located in the engine compartment fuse box. This fuse protects the power circuit to the Transmission Engine Control Unit. When the fuse blows, the engine will still run however you have no gears, hence movement of the 3 is inhibited.
Anything over eight years in service is considered good capacitor life. If the capacitor does fail and fuse 30 blows, a quick fix is just to disconnect the capacitor and replace the fuse.
The capacitor might be missed by the DOT/FCC but the 3 does not seem to mind. With the filter disconnected, solenoid noise might be heard on some radio stations but at least the 3 would be in motion.
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