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92 Legacy fuel sending unit trouble
Posted 14 March 2004 - 10:54 PM
When vacuuming the car I noticed wires coming inside from under a oval cover in the trunk, passenger side just behind the seat. I took the cover off and found that the original 5 wires to the sending unit plug in connector had been cut and new ones were attached. There has obviously been a problem with this before.
Finding another cover at the other side of the car (driver's side) I took that one off too and found a 2 wire connector that wasn't plugged in to some other fuel tank sensor.
Can anyone tell me the relationship between the 2 sensor? Could the 2 wire not being connected throw off the reading on the gauge? I guess I'll find out after emptying the tank again but wondered if anyone has played with this before. Thanks
Posted 15 March 2004 - 05:10 AM
Posted 15 March 2004 - 08:53 PM
If you need the units, I have both from a spare car we parted for my son's auto to manual trans swap. Lmdew@hotmail.com
Posted 18 March 2004 - 05:20 PM
Plugging the driver side connector back in, didn't seem to have any effect.
Could it be a couple of wires are swapped? Does anyone know where to get wiring diagrams for this?
Posted 20 March 2004 - 11:41 AM
It sounds to me that the drivers side sensor has a open connection to it. Checking the resisitance of the sensor with an ohmmeter will tell you if that is so. This is a fairly common problem with these cars.
Posted 20 March 2004 - 12:01 PM
By the way the low fuel light will still work if the gage doesn't. I let it get low so I could check and even though the gage was better than half, the light came on.
Do you know what ranges the resistance should be in?
Posted 20 March 2004 - 12:36 PM
As far as the resistance goes, I am not sure but I seem to remember something like around 5k ohms possibly. I have heard that just cleaning the contacts sometimes will get them working again.
Posted 30 March 2004 - 11:14 AM
In the Turbo there are two sending units, main and sub. I found the sub unit unplugged at the connector (2 wire resisitor, blue in green out). I think this was the original problem. Whoever tried to fix it only went to the main, 5 wire connector (pump and fuel indidcator) and thought there was a bad wire. The cut out the section that went under the car (from under the rear, passenger side seat it leaves the inside of car and travels to top of fuel tank) and spliced in 5 new wires.
By doing this they removed the part of the curcuit that included the sub unit connection, which is a series connection into the main unit resistor. I wired the sub unit back in and the fuel gage works correctly once again, or maybe for the first time as I would suspect the unplugged connector was a factory miss.
Josh, I have a very clear wiring schematic of this that I would like to scan and send to you for posting on your site.
Thanks for the help gang, keep off the path!
Posted 30 March 2004 - 12:40 PM
yeah send it over when you get it scanned and I'll put it on there!
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