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Posted 27 April 2004 - 07:15 AM
The ECU pinout gives me the following info:
Terminal 39 : Backup Power Supply : Ignition Switch
'Off": 10 -- 13
Terminal 1 and 2 : Control Unit Power Supply
Terminal 21 : Sensor Power Supply
Does this mean I need to run an always hot wire to Termnial 39 ?
Can I just grab a hot wire from the fuse box and use that ? Or is it better to
straight from the battery ?
As to terminals 1,2 and 21, should I just run a switched hot wire to those ?
Subaru EJ25 Powered 1970 VW Beetle
2004 Subaru WRX Sportwagon
Posted 27 April 2004 - 10:20 AM
Posted 27 April 2004 - 12:02 PM
but from what i do know of how stuff works /is wired
backup is a constant voltage <fused direct to battery type thing>
and the ecu power i would guess to be turned on when the ky is in the run/start positions
as far as sensor power.. hmm that could depend on
if its supposed to be a regulated steady voltage or if it takes the voltage and tehn regulates it to transfer out to sensors and then based on the return voltage take its readings...
but i could be way wrong
Posted 27 April 2004 - 03:29 PM
IIRC, "backup power supply" was simply another switched 12v wire from the ignition switch. There is one wire that goes to the battery for ecu power 24/7, but I don't think it was the "backup power supply" wire.
Basically, there are 2 or three wires that power the ecu, and 1 small diameter yellow wire that connected directly to the battery.
I'm also using a '91 legacy engine. I don't know how much they changed.
Posted 02 May 2004 - 10:26 AM
How did you wire up the alternator ?
There's a plug with 2 wires and another white wire on the Sube one.
How did you link this into the VW wiring ?
Posted 02 May 2004 - 08:20 PM
After studying the schematic for a while, I figured that the tickler and the warning light wire both need vlotage at them. So I'm assuming I did it correctly.
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