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Thread: B5 A4 fuel gauge malfunction

  1. #11

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    Hi Gbomer,
    Unfortunately, I haven't been able to resolve my fuel gauge issue. The fault code indicates there's a short somewhere ("00771 - Fuel Level Sensor (G) 29-00 - Short to Ground"). I think I know the wire that's the culprit, but I'm reluctant to pull the whole dash out to trace the wiring harness.
    Hopefully your problem is a sender issue, as that's the easiest to fix. Have you measured across the plug at the sender unit (pins 2 & 3) to see if it gives a variable resistance? From memory it should be from around 40 ohms for full up to 200-something for empty. Rock the car to slosh the fuel in the tank around and the ohm meter reading should move too. In my original post, I included the circuit diag with the relevant parts highlighted. If the ohm readings indicate a faulty sender, it's not too hard to remove the sender from the tank, just make sure the tank's not full and have good fuel-resistant gloves. The sender is just a dumb variable resistor, so if it is not giving a proper reading, it could just be a broken wire or a gummed up 'slider'. If the sender checks out though, then I'm afraid you're in the same boat as me chasing either a wiring fault in the loom or a problem on the gauge itself, which is integrated in the cluster, so I can't see how it could be fixed individually without a degree in Electronic Engineering!!

    2001 A4 B5 1.8T (APU)
    "Claudia "
    Factory Sports Pack
    no mods...as original as I can get it!

  2. #12

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    Did you swap the cluster. That will eliminate/confirm whether it’s the cluster or harness. I have the pinouts for the cluster if you need.

  3. #13
    Join Date
    Jun 2009
    Location
    Sydney
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    Thanked: 91

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    Quote Originally Posted by Staffanski View Post
    The fault code indicates there's a short somewhere ("00771 - Fuel Level Sensor (G) 29-00 - Short to Ground").
    Short to ground means the circuit is open ie the fuse blown
    '99 Quattro, stroked 2L
    Concept, tune and build by QMS
    EFR 6758, Bosch 1000cc, E85 @7bar, Bosch 413 in 034 surge tank. VVT cam timing upgrade. Controls by Eurodyne boost manager, V8 MAF, LC1, EGT. JE 9:1, 13kg 2L Crank, 475gm rods, Ferrea , Dowel pin crank, IE tensioner, 034 Pheno Spacer, FX400 240mm x6, Apikol SMIC, Miltek 2.75 Koni coils, Stoptech BB, Powerslot Rear, SS lines, 034 G/b, Apikol Diff mounts, APR snub mount.



  4. #14

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    Thanks jsol, rockersteady,
    Fuses are all good, and unfortunately I don't have access to a spare cluster to isolate the issue at the gauge. I'd tested sender and the lines all the way from the sender to pin #5 on the cluster plug (as per the wiring diagram) and all is good, so at this point it's fallen into the 'too hard' basket. My feeling is that there is an earth issue on the ground side of the cluster, but I' leaving it for now till I have the sufficient other reasons to make it worth pulling the whole dash out and properly check the wiring loom behind.

    2001 A4 B5 1.8T (APU)
    "Claudia "
    Factory Sports Pack
    no mods...as original as I can get it!

  5. #15
    Join Date
    Jan 2009
    Location
    Blue Mountains, NSW
    Posts
    2,042
    Thanked: 54

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    I've got a spare cluster you can test with from my B5. Where are you located?

    Current:
    2004 A6 C5 Sedan 3.0 V6 Quattro
    1999 A4 B5 Avant 2.4 V6 (Unreg)

    Retired:
    1990 100 Sedan 2.3
    1991 90 Sedan 2.3
    1999 A4 B5 Sedan 2.4 V6
    2005 A6 4F Sedan 3.2 V6 Quattro

  6. #16

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    Thanks broke90, that could be an option as I see "Blue Mountains" on your Location. I'm in far north west Sydney, in the Hawkesbury near Windsor.

    2001 A4 B5 1.8T (APU)
    "Claudia "
    Factory Sports Pack
    no mods...as original as I can get it!

  7. #17
    Join Date
    Jan 2009
    Location
    Blue Mountains, NSW
    Posts
    2,042
    Thanked: 54

    Default

    I'll pm you.

    Current:
    2004 A6 C5 Sedan 3.0 V6 Quattro
    1999 A4 B5 Avant 2.4 V6 (Unreg)

    Retired:
    1990 100 Sedan 2.3
    1991 90 Sedan 2.3
    1999 A4 B5 Sedan 2.4 V6
    2005 A6 4F Sedan 3.2 V6 Quattro

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