Technical > Wiring & Sensors
Fuel pump relay staying on when VEMS powered OFF through P259 output
PeepPaadam:
I noticed that too in summer when first installed v3.8 board and I just removed the diode on the fuel pump output, left the others in place.
jrussell:
In case someone finds this thread with a search:
http://www.vemssupport.com/forum/index.php/topic,2565.msg24330.html#msg24330
--- Quote ---either remove the protection diodes (but there is a reason they are there).
Or make sure your relays are not powered when the ecu is not powered, thats it, changing 1 wire from vbat+ to switched vbat seems te easiest (and recommended) route.
--- End quote ---
Kamuto:
--- Quote from: jrussell on October 30, 2015, 06:47:20 pm ---In case someone finds this thread with a search:
http://www.vemssupport.com/forum/index.php/topic,2565.msg24330.html#msg24330
--- Quote ---either remove the protection diodes (but there is a reason they are there).
Or make sure your relays are not powered when the ecu is not powered, thats it, changing 1 wire from vbat+ to switched vbat seems te easiest (and recommended) route.
--- End quote ---
--- End quote ---
only few ecus were affected by this, current ones don't have this problem :)
GintsK:
Hi,
seems V3.8 was changed without changing the version numbering [wow!, I was surprised!]. In beginning protection diodes was routed to EC36-25 now same diodes go to EC36-23 (flyback wire) - more reasonable solution. So it is wise to wire up relays with coil connected to this wire.
Gints
Wolf_Tm:
Having this problem too, even if new ecu.
With key to OFF, Main relay and Fuel Pump relay are still getting a 4V in the relays' coils, making the Fuel Pump to start.
And they are getting the 4V from the Flyback wire, as removing it from ecu would shut the relays off.
What about connecting the Flyback to the Fuel Pump Positive AFTER the Fuel Pump relay?
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