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.

[WannabeGT4]

i have it wired up so that when the car starts it looks like the relay is always closed (pump is always on)

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.

The relay should be triggered by the INT pin of the ECU.

When the ECU switches INT to ground it completes the relay's trigger circuit. This is the only time the pump should be running.

also, the ecu regulates the pump, its not on all of the time. It'll probably throw a code if its sensing voltage when the pump is supposed to be off.

Absolutely correct. It WILL throw a code if it is constantly running.