|Pinched for another site re Camry fans not operating:|
There are actually 3 temp sensors.
1 is on the top of the engine that goes to temp gauge in dash has 1 wire.
Next to it is a 3 wire sensor for engine control and choke.
On the bottom of the radiator, next to the hose, is a 2 wire sensor.
Loosen all 3 but leave connected.
Get engine hot past halfway point on dash gauge.
With AC off, disconnect 1 sensor at time.
Start with 2 wire under radiator, as it takes the most abuse. Fan will come on when you disconnect broken sensor.
2 sensor must agree for fan to stay on till engine cools when turned off.
Note: This is solution I used after verifying fuses, fuseable links and relays worked. WOO HOO!
Make sure you check both the fuse box under hood and fuse box left side of steering wheel my ECU fuse was inside my bros was outside.
ECU B on my car goes to nothing and is under hood. Had it confused with ECU on wiring diagram. DOH!