Hi speed cooling fan trouble

[admir87]

its a hard one, so the fan definalty doesnt which ON after 20sec(temp disconected, engine running?

just confirm the blue/orange wire again, put mulitmeter on it, and watch it when the voltage jumps does the fan increase?

confirm the voltage too? 9v? or 12-13v(engine running)?

 

[Brett_jjj]

There is definitely no diference at all when the fan is running,and the hi relay is pulled out.I tried it a dozen times.Fan stays the same speed.The fan does come on after around 10 seconds,with temp sensor wiring disconnected.But it doesnt change after a few seconds to hi speed like it should be doing.

 

[admir87]

just confirm blue/orange voltage after 20sec of temp disconected, engine running? 9v? or 12-13v?

turn engine on, connect the multimeter to orange/blue and earth, dissconect the temp sensor, and when the voltage jumps do you notice any change in the fan speed?

 

[Brett_jjj]

9 volts on the orange/blue wire that goes to terminl 87 on the relay.

 

[admir87]

when you see the 9volts jump, can you hear any difference in the fan speed?

 

[Brett_jjj]

No change in speed at all.The fan just starts up and the reading goes to 9 volts.

 

[admir87]

what happens to the voltage at blue/white, when you get the 9v on the orange/blue?

 

[Brett_jjj]

I will go find out.

 

[Brett_jjj]

When theres 9 volts at orange/blue,theres 13.8 volts at the blue/white wire.This is crazy,before when I checked there was no change from 5 volts on the blue/white wire.(ive tripple checked everything to be sure of the readings)

 

[admir87]

haha, thats not right at all,

ecu is meant to drop the voltage, then orange/blue gets power

with 13.8v at blue/white you the fan shouldnt be getting power at all
something funny is going on... i know this is very repetative, but try another relay, swap it for another one that are in the fuse block