[mmac]

Okay, I have read a lot of threads on this subject and unfortunately I haven't seen anything I haven't tried. My problem is that the cooling fan on my daughter's 94 camaro 3.4L is not coming on at all. I have done the following to check it:

1. Replaced both heat sensors in the manifold - the one that sends a signal to the guage and the other that sends the signal to the ECM (I think).
2. Replaced the relay for the fan motor. Thinking maybe that the new relay was faulty I took it back to the parts store and they tested it and confirmed that it IS working.
3. Checked all fuses - all good
4. Jumped to the fan motor to ascertain whether the motor is working or not with power - it does work.
5. Checked the voltage to the fan after the engine reaches a high temp (yes, it is on the verge of overheating so the temp should be high enough to kick the fan on). There was 0 voltage reaching the fan motor.
6. Unplugged the harness from the fan motor and checked the continuity of both wires - the hot wire to the relay box and the ground to the car body. I had continuity in BOTH so it's not that wire harness.
7. Checked the voltage coming into the relay box. As expected, 12v on two of the leads and 0 on the other two.

Summary of the situation - the fan motor is good, the sending units are brand new, the wiring seems to be intact based on tests, and yet the fan motor does not come on under any circumstances.

I'm inclined to believe (based mostly on posts here) that the problem is the ECM. Have I missed something else that could be causing the problem? If the ECM is my only remaining possibility (as I believe it is at this point), is there a way to check it out or do you have to replace it and cross your fingers?

Any help would be greatly appreciated!
Mark