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Still looking for what case backhoe has for ohm range on fuel sending unit. case 580 sl series 2 empty to full

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  • Cars & Trucks Master
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Click on the link, I can only talk to you in automotive terms. I know nothing about a backhoe. The sending unit has to have voltage, correct? Get a resistor for empty and one for full, If the gage acts proper to the resistors, the problem is the sending unit.
If that isn't the answer you wanted, sorry, that's all I got.
http://www.tanksinc.com/index.cfm/page/ptype=results/category_id=159/mode=cat/cat159.htm

Posted on May 01, 2017

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Posted on Jan 02, 2017

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2004 trailblazer...fuel guage tags full when empty....rears Reads empty when full...changed fuel sending unit...no fix....replaced instrument cluster....no fix. Help


Have the vehicle check for DTC'S - diagnostic trouble codes ! The sending unit is an input to the PCM - engine computer . The PCM sends this info to the instrument cluster over class 2 serial data network . Do you know anything about class 2 communication's network . The ideal way to diagnose a problem like this , check for codes , view data on scan tool . Buick Class 2 Operation Diagnosis 1998

Fuel Gage
The instrument panel cluster (IPC) displays the fuel level as determined by the engine control module (ECM). The IPC receives a serial data message from the ECM indicating the fuel level percent. The fuel gage defaults to empty if:
• The ECM detects a malfunction in the fuel level sensor circuit.
• The IPC detects a loss of serial data communications with the ECM.
When the fuel level is less than a pre-determined value, the IPC illuminates the low fuel indicator.

DTC P0463

Install a scan tool.
Turn the ignition ON, with engine OFF.
With the scan tool, observe one of the following fuel level parameters:
• Fuel Level Sensor parameter in the PCM Enhanced EVAP data list.
• Fuel Level Sensor parameter in the PCM EVAP data list - 4.2L only.
Does the scan tool indicate that the Fuel Level Sensor parameter is less than the specified value?

Feb 19, 2017 | Cars & Trucks

1 Answer

Why would Fuel gauge fluctuate erratically then shake at blinding speed?


Bad sending unit, bad ground, bad gauge, I have seen sending unit go bad they will work part way.

Jan 02, 2016 | Cars & Trucks

1 Answer

How to fix fuel guage


ZJ
what does it do now? stuck high, low. ,read off a bit. ? or what?
the tests are easy.
covered in the FSM 100% ( in a bad way)
see that here in chapter,called, "instrument panel"
chapter 8E.
page 5
as you can see the gauge is digital (CCD)
and the PCM (engine controller) sends fuel data to the gage via
the CDD data bus.
so the sender , may be telling the PCM wrong information.
I'd start there.
if your read page 5 it tells you the PCM sends, Empty stop data
to the gauge when the sender messes up.? DID YOURS?
does your low fuel warning lamp still work?
if not, that is clue 2 that the sender is BAD. if dead lamp.

that means sender bad, or wires TO it are bad, as in all cases, electrical..
In a real Jeep dealer, they use the DRB tool and read the sender
data directly and in 1 second, ahhh, it reads wrong.
then find the cause.
but us poor, sand crabs, we dont have DRB scanners.
we are not blessed.

but we are not helpless, not yet.
see the last chapter "wiring", see the fuel page. #
8w=20-3 (pdf 69)
see the sender
see the 2 wires,
see the colors. bingo.
what i do is, inplug the PCM (battery neg lug, disconneted)
the measure the resistance of the 2 wires.
DB-LG and BR-YL
PCM C2 -A4 and C1-c26

the sender is JUST a crude Rheostat (a wire wound var. resistor)
0 ohms (near is full) 100 (near is empty)]
if it reads infinity the line is bad. wires, connector all the way to the sender.

old data on older jeeps 86
73 ohms Empty 23 ohms 1/2 tank 10 ohms Full

1998
With float in up position, resistance should be 20 ohms. With float in down position, resistance should be 220 ohm
i dont have spec. on all years.
but it dont matter.
its near zero full
and near 100 to 200 empty
and infinity dead, they all wear out and go open circuit some day.
or the connector rusts 100:1 . over bad sender.
corrosion is no rare thing on cars.

1997 TJ
20 ohms - full
220 ohms - empty.

im scanning the internet finding others data.


96 GC

The same wires can be tested on the pump side to measure the resistance of the sending unit. A low resistance of 20-30 ohms would indicate a full tank and an empty tank should be around 260-300 ohms. If the sending unit resistance tests higher or open circuit the sending unit is bad.

Apr 28, 2014 | 1996 Jeep Grand Cherokee

1 Answer

Faulty gas gauge


Most of the time its is the sending unit in the fuel tank. The test for it is to use a variable resistor that is hooked up to the wiring at the fuel tank and watch the fuel gauge if the gauge works ok thats makes 100% sure its the sending unit. At 245 ohms the gauge should read full, 180 ohms for 3/4 full, 160 ohms for 1/2 tank, 100 ohms for 1/4 tank and 42 ohms for empty. The color of wires at the fuel tank is purple wire and black wire. You can also use fixed value resisters. If the fuel gauge the wires from the sending unit to computer then to gauge for bad connections, shorts, broken wire and bad grounds. If the wires test ok that only leaves insterrment cluster or computer which even most dealers can't test eather one but the insterment cluster would be a more common problem then the computer. But about 95% of the time it will be the fuel level sensor in the gas tank that causes the problem. Good luck.

Jan 08, 2011 | 2000 Pontiac Grand Prix

1 Answer

Recently put a full tank of gas in 199 sl2, now the low fuel light is on and the gas gauge shows empty. what to try next


Assuming nobody stole all of your gas, the fuel level sending unit is bad, the wiring to it is bad, or the instrument panel is failing.

The wiring can be accessed inside the trunk, on the left side, by pulling the carpeting up. The sending unit should read about 35 ohms when full and 235 ohms when the tank is empty. My Haynes manual says the wires are Purple, and Black-White.

If the sending unit reads correctly then the wiring to the instrument panel, or the panel itself is malfunctioning.

If it is the sending unit: the sending unit is attached to the fuel pump inside the fuel tank. You must remove the fuel tank to replace it. While you are in their you might as well put a new fuel pump in.

Jan 05, 2010 | 1999 Saturn SL

1 Answer

1999 gmc jimmy fuel gauge reads empty, pulled fuel tank test sending unit and it ohms out ok??Any wiring issues to look for


look for a short in the sending wiring, empty means the circuit is closed, open circuit full

Nov 28, 2009 | 1999 GMC Jimmy

2 Answers

Fuel gauge not working all the time.


This is a normal concern.
The instrument cluster uses 4 different operating modes to calculate the fuel level:
Anti-slosh (default mode)
Key OFF fueling
Key ON fueling
Recovery
After a fuel fill up, the time for the fuel gauge to move from empty (E) to full (F) ranges from 2 seconds to 55 minutes depending on which operating mode the fuel gauge is in.
The default fuel gauge mode is called the anti-slosh mode. To prevent fuel gauge changes from fuel slosh (gauge instability due to changes in fuel sender readings caused by fuel moving around in the tank), the fuel gauge takes approximately 55 minutes to go from empty (E) to full (F).
The key OFF fueling mode (2 seconds to read empty [E] to full [F]) requires 3 conditions be met:
The key must be in the OFF position throughout the entire refueling of the vehicle.
At least 15% of the vehicle's fuel capacity must be added to the fuel tank.
The instrument cluster must receive a valid key ON fuel sender reading within 1 second of the key being put into the RUN position. The key ON sample readings are considered valid if the fuel sender reading is between 15 ohms ± 2 ohms and 160 ohms ± 4 ohms.
If these conditions are not met, the fuel gauge stays in the anti-slosh mode, which results in a slow to read full (F) event.
The key ON fueling mode (approximately 90 seconds to read empty [E] to full [F]) requires 3 conditions be met:
The transmission is in PARK (P).
The key is in the RUN position.
At least 15% of the vehicle's fuel capacity must be added to the fuel tank.
In key ON fueling mode, a 30-second timer activates after the transmission is put into the PARK (P) position (automatic transmissions). When the 30-second time has elapsed and at least 15% of the vehicle's fuel capacity has been added, the fuel gauge response time is 90 seconds to read from empty (E) to full (F). When the transmission is shifted out of PARK (P), the fuel gauge strategy reverts to the anti-slosh mode. The key on refueling mode prevents slow to read full events from happening if the customer refuels the vehicle with the key in the RUN position.
Recovery mode is incorporated into the instrument cluster strategy to recover from a missing fuel level input during a refueling event. Missing fuel level inputs result from intermittent opens in the fuel sender or its circuits. Recovery mode (empty [E] to full [F] approximately 20 minutes) is initiated when the following 2 conditions are met:
The instrument cluster is in the anti-slosh (default) mode.
The actual fuel level in the tank is greater than what is being displayed by the fuel gauge

Feb 18, 2009 | 1983 Mercury Grand Marquis

1 Answer

What are the ohms on the fuel sending unit


If your gauge isn't working correctly and you ground the sending unit wire and the gauge pegs to full then you need to replace the sending unit. As long as the ohms increase and decrease with float movement then the rheostat is doing what it should.

Feb 15, 2009 | 1992 Ford Thunderbird

2 Answers

Fuel sender unit ohms on a 1991 80series landcrusier


Early FJs had a fuel sender with an ohm range of 2.1ohms when full, to 4.5 when half full, to 6.5ohms when empty. Some may range from 33-240 ohms. You should use a VOM (ohm-meter setting) to measure this resistance value at full, empty and half-full positions. Then you will know what gauge to purchase!!! Hope this helps, thanks for using Fixya.com to help solve your issue. Tater Todd

Jan 28, 2009 | 1992 Toyota Land Cruiser

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