Fuel Gauge Problem - Toyota Yaris Forums

goosefraba · 09-06-2014, 12:04 PM

Fellows,

My 2012 SE's fuel gauge is not right. It started off by dropping to the low fuel light from 3/4 tank within a 20 minutes span... kept there for a couple days... then jumped to full after filling the tank... wandered a bit then popped up to full... stayed on full for 180 miles, then dropped to the low fuel light. Interestingly, the "range" display in miles computed accurately at one point with the Trip meter for a while, but jumped to back to wacky. I guess it will periodically take a tank reading in the computation? Last night, the gauge moved from fuel light and is now reading 1/4 tank steady (110 miles on tank, so the reading is still wrong).

I am out of warranty so would like to fix this myself. Do you recommend replacing the sender first? If replacing the sender, does the sender unit itself pop out of the pump/filter assembly, and does the wire pair connector pop out as well = meaning easy? I have a good idea what it takes to remove the assembly from the tank, but want to make sure there are no gotchas.

Are there fuses to try or would you recommend running diagnostics from the harness connector that plugs into the instrument cluster (which CTScott described which wires/pins to check ohms in a fuel gauge thread).

One problem is that I do not have a service manual and do formal instructions of how to remove the rear seat properly and how to get to the gauge cluster without possibly breaking stuff!! It seems to me that the service/repair manuals are not very available. Do you know a good source for a manual?
Thanks

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09-06-2014, 12:04 PM	#21
goosefraba Drives: 2012 se Join Date: Sep 2014 Location: texas Posts: 3	Fellows, My 2012 SE's fuel gauge is not right. It started off by dropping to the low fuel light from 3/4 tank within a 20 minutes span... kept there for a couple days... then jumped to full after filling the tank... wandered a bit then popped up to full... stayed on full for 180 miles, then dropped to the low fuel light. Interestingly, the "range" display in miles computed accurately at one point with the Trip meter for a while, but jumped to back to wacky. I guess it will periodically take a tank reading in the computation? Last night, the gauge moved from fuel light and is now reading 1/4 tank steady (110 miles on tank, so the reading is still wrong). I am out of warranty so would like to fix this myself. Do you recommend replacing the sender first? If replacing the sender, does the sender unit itself pop out of the pump/filter assembly, and does the wire pair connector pop out as well = meaning easy? I have a good idea what it takes to remove the assembly from the tank, but want to make sure there are no gotchas. Are there fuses to try or would you recommend running diagnostics from the harness connector that plugs into the instrument cluster (which CTScott described which wires/pins to check ohms in a fuel gauge thread). One problem is that I do not have a service manual and do formal instructions of how to remove the rear seat properly and how to get to the gauge cluster without possibly breaking stuff!! It seems to me that the service/repair manuals are not very available. Do you know a good source for a manual? Thanks