| If Guy is right (and I think he is), then the failure is a result of an air leak.
If the pump doesn't reach it's max pressure within a set time period, it times out. If it times out twice, the microprocessor cuts service to that door or the trunk permanently.
I don't think there is a mechanism for the pump to stop working if the problem is that the actuator piston doesn't extend properly and do it's job. Presumably in this situation, the pressure would be fine, and so the pump would think that everything is fine.
Brett
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