I am ahead of beginner..but not an expert. So I have some not so easy questions

I have 93 maxima se which I love to drive. I found out that cooling fan run on 2 speeds low and high depending on temp.

But in my car it runs only high speed.

I have FSM it will run at low speed at 95C and at high speed 105C approximately (if car is below 20 miles/h speed or parked).

So I started looking at connections as per procedures (Fan running at low speed) in FSM. By speed I mean here running speed of the FAN.. and not the vehicle

So far it is OK with voltages and continuity at Fan Relay 1 and also at Cooling Fan. I also gave battery voltage to cooling fan pins directly from battery. it runs slow...

Now I can exclude
- connections from relay to fan motor
- motor
- Coolant temperature sensor (becos it can make fan run high speed if temp goes above 105c)


Now item left to check is Relay and connection from ECM to relay...

Can any one please help...
or any suggestions as to where I can get it fixed .. Dealer or any other automotive shop...

For the shop it should be that tough of a task.. since I have checked couple of things my self...