signal from ecu to coolant level sen., st205, maybe it will do better to post it here Options

[urbandork]

ok so my st205 water pump is hooked up just as it is on the edw except since i didnt have a relay for it so i just ran the wires around the would be relay.

im drawing my power from the cds fuse just like it shows on the ewd and the ground is also ran just like it is on the ewd.

the other three wires from the pump hook up to the corisponing wires on the ea1 connector which feed back into the ecu just like it is on the ewd

the level sensor has been tested and found that it does
close and complete the cuircut

i checked continuity between the ecu and sensor plug and fount that im not getting a signal from the ecu to the sensor......

........ anyone know what kinda signal is sent out from the ecu to the sensor which goes from the sensor (if closed) and to the ground.

[lagos]

read this on how relays work
http://electronics.howstuffworks.com/relay.htm

you cant power something like an intercooler pump off of your ecu. it needs more power then the ecu was designed to handle, so youll just end up frying something. you want the pump to get its power right from the battery (with a fuse in line), and hook up the other part of the relay to the ecu, so that the ecu can trigger it on/off as it needs to.

This post has been edited by lagos: Dec 5, 2006 - 5:24 PM

[urbandork]

read this on how relays work
http://electronics.howstuffworks.com/relay.htm

you cant power something like an intercooler pump off of your ecu. it needs more power then the ecu was designed to handle, so youll just end up frying something. you want the pump to get its power right from the battery (with a fuse in line), and hook up the other part of the relay to the ecu, so that the ecu can trigger it on/off as it needs to.

but i am drawing power from a 12v source with a fuse in line. Im running power from the exact same fuse as it was on the st205, which is the cds 30a fuse which draws its power from the bat after going through the key switch.

what should i do?

i have it wired up so that when the car starts it looks like the relay is always closed (pump is always on) Isnt this how its supose to be even when the relay is in line???? this is how it appears on the ewd. cus once the key is turned it supplies constant power to the relay before getting fed back into the ecu.

the ewd shows the power going to the magnet being drawn from the 7.5a IGN fuse which is on all the time when ur driving. thus keeping the relay always closed when the car is running. after it exits the relay it goes into the ecu.

the ewd shows that after the relay is closed power coming from the CDS 30a fuse goes into the relay switch and then to the pump and powers it.

then the ground wire goes back to a ground and the three other wires which the ecu uses to monitor the pump goes back to the ecu jsut as it shows on the ewd.