the way i interpret this ("the four wheel speed sensors from the CAB") is:
1- that all four sensors must be functioning right, and
2-that it can take readings from anyone.
in other words, that if any of the four sensors is malfunctioning, the spoiler will go weird.
please correct me if am wrong.
but, in my case, as the CAB is performing fine, then all four sensors are doing fine. right?
then must be another reason for my spoiler doing bad.
what could be? the battery is new and the volts readings are fine, i installed the ground as per pizzaguy, replaced the crankcase and crankshaft sensors with bosch oem ....