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may be you can redo the testing this time at the big connector that plugs into the ECU. That way your test would include the harness wiring that goes along the car up to under the seat.
The ref sensor is accessed on pins 25 and 26. The speed sensor is accessed on pins 8 and 27.
ECU disconnected, of course. These are passive sensors, so they don't need power and can be checked just by cranking.
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Gilles
RoW 88 Carrera coupé
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