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I recently purchased a second 2004 MINI Cooper R50 with two issues (not starting and not shifting into higher gears with a CVT). Using ISTA and INPA, I found that the transmission would throw an EP error once it had issue with the Rotational Speed Sensor (0721). I attempted to replace the original, same issue arose immediately. I replaced the connector…same issue. Thought it might be a bad sensor…replaced with no fix. Noticed the wire on the pigtail had burned up the insulation was completely gone, exposing bare wire on all three wires. I replaced the engine wire harness and another sensor…burned up again! No issue on the wire in the harness, just from the connector to the sensor. This is all that has been done so far, but it still losing sensors
– Replaced Engine Harness
– Replaced ECU (Computer) with a newly programmed device
– Replaced Engine Fuse Box
– Replaced TCM
– Replaced Valve BodyThe car is started, moved no more than 100 yards, checked and the wire is already destroyed.
Any ideas?
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Some section of wiring connected to that harness section has a short to ground and is running excess current through those wires.
It has three wires to the sensor in the harness. One wire goes to the engine fuse box 15amp fuse that has never tripped. The other two go to the engine computer, a signal and ground. The fuse box, computer and harness have all been replaced.
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