Question about Pontiac Grand Am

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On a 99 grand am the gas gauge allways reads empty what is the color is the ground wire for the gas gauge

Posted by Terry firnstahl on

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1 Answer

Jeff Armer

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  • Pontiac Master
  • 15,575 Answers

It's not the ground wire , the gauge grounds inside the instrument cluster .Your sending unit or the gauge it's self is bad .
Body Control System Operation
The Body Control Module (BCM) performs the following functions:
?€¢
Gauge control


?€¢
Instrument cluster indicator control


?€¢
Fuel gauge control


?€¢
Temperature gauge control


?€¢
Theft deterrent


?€¢
A/C compressor request


?€¢
A/C cooling fan


?€¢
Exterior and interior lighting control for the following lamps:


-
Daytime Running Lights (DRL)


-
Automatic lighting control


-
Fog lamps


-
Interior lighting


?€¢
Battery rundown


?€¢
Chime


Gauge Control
The Body Control Module (BCM) receives Class 2 serial data messages from the Powertrain Control Module (PCM) to determine the following gauge information:
?€¢
Engine coolant temperature


?€¢
Fuel level sensing


Your best bet is to take your vehicle to a qualified repair shop !
Fuel Gage Inaccurate or Inoperative

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Select the PCM display DTCs function on the scan tool.
Does the scan tool display any DTCs?
--
YES - Go to Diagnostic Trouble Code (DTC) List (2.4L) or Diagnostic Trouble Code (DTC) List (3.4L) in Engine Controls
NO - Go to Step 3

3

With the scan tool, select Instrument Panel Cluster, Special Functions and command the fuel gauge UP.
Does the fuel gauge complete a full sweep when commanded?
--
YES - Go to Step 4
NO - Go to Step 12
  1. Turn OFF the ignition.
  2. Disconnect the fuel level sender.
  3. Connect the J 33431-C Signal Generator and Instrument Panel Tester between the signal circuit of the fuel level sender and the ground circuit of the fuel level sender.
  4. Turn ON the ignition, with the engine OFF.
  5. Important: Verify the J 33431-C resistance setting with a DMM.
  6. Set the resistance on the J 33431-C to 40 ohms.
Does the fuel gauge display at or below empty?
--
YES - Go to Step 5
NO - Go to Step 6

Posted on Jul 28, 2016

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5 Related Answers

Anonymous

  • 32 Answers

SOURCE: gas gauge

The float that moves the gas hand is possibly stuck in the tank. If there's isn't an access hole in the rear of the vehicle you'll have to drop the tank. Unless it becomes free on it's own. Hope this is helpful. Please rate. Thanks

Posted on Sep 28, 2008

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sickforvws

sickforvws

  • 40 Answers

SOURCE: 99' blazer gas gauge eratic

I have the same problem on my 99 ZR2 Blazer. This is the rheostat in the gas tank. I bought my part in Ebay for $27. The only issue is that you have to drop the gas tank and pull the sending unit to install. Hope this helps, I hear from other message boards that it is a very common problem in these vehicles.

Posted on Jan 29, 2009

CMV9

Cameron Viseth

  • 594 Answers

SOURCE: gas gauge reading empty even when tank is full

Usually if the gas gage does not work yes it is true it may be the sensor if it is electronicly controlled. the sncor will more than likley be in the tank. here is how to remove your gas tank.

  1. Before servicing the vehicle, refer to the precautions section.
  2. Relieve fuel system pressure.
  3. Drain the fuel tank.
  4. Remove or disconnect the following:
    • Negative battery cable
    • Fuel filler and vent hoses
    • Fuel tank skid plate
    • Fuel tank wiring connectors
    • Fuel supply and return lines
    • Fuel tank
    • Fuel pump assembly
      7924bg17.gif Fuel pump assembly mounting
To install:
  1. Install or connect the following:
    • Fuel pump assembly
    • Fuel tank. Tighten the bolts to 27 ft. lbs. (36 Nm).
    • Fuel supply and return lines
    • Fuel tank wiring connectors
    • Fuel tank skid plate
    • Fuel filler and vent hoses
    • Negative battery cable
  2. Start the engine and check for leaks.

Posted on Apr 16, 2009

Anonymous

  • 13 Answers

SOURCE: 1993 Jeep Grand Cherokee gas gauge reads empty but tank is full.

Fuel level sending units are known to go bad on these.

Posted on Jun 22, 2009

emissionwiz

Marvin

  • 85239 Answers

SOURCE: 99 Chrysler 300M gas gauge droping down to empty

you are going to have to replace the sending unit for the gas gauge, it is located in the fuel tank.

Posted on Jul 20, 2009

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Hello! There is a sensor ground wire ...Color is Black/Light Blue (pin#4 of a 22 pin connector on the PCM which is sensor ground...That is the same wire multiple that feeds ground to the fuel pump unit (a variable resistor that senses whether the tank is full or empty)...When the vehicle heats up this ground which is more than likely corroded or rusted becomes resistive and opens...The vehicle has some years on it and it's not uncommon for ground straps to rust through,,,The gauge drops to empty...This tells the system; "I'm out of gas" and Sets the fuel level sensor signal to the PCM shutting down the engine...

Your going to need a multimeter (preferably digital) and a wee bit of experience using it...If your not up to this just send a comment and you can then take it to a mechanic and describe the problem specifically...

If you have a meter ( home improvement stores sell them for under $20)...Here are a couple of test procedures to narrow down and solve the problem...

There is a four wire connector that comes out of the top of the gas tank that may be to difficult to reach...Wire colors are...Black...Dark Green/Black...Black/Light Blue and...Light Blue/Yellow...The wire you are interested in is the "Black/Light Blue"...This is a chassis ground wire...There should be Ground straps on the frame...With the meter set on X10 ohms scale... Search under the vehicle for that section of wire harness comming out of the top of the gas tank that contains the above mentioned colors...When you find it ...push the point of a safety pin into the Black/Light Blue wire...Clip one meter probe to it and the other probe to bare metal chassis ground...Or make that probe wire long enough to touch the negative battery post...You must read zero ohms or very close to it...Record reading...Next clip one probe to bare metal chassis ground (a bare fender or firewall bolt...The other to the center of the negative battery post...Meter set the same...Record reading...Next move from chassis ground to the engine block (bare metal)...Record reading...Send results to Saailer

I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

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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.

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My 1969 chevelle's gas gauge is stuck pass full.bad gauge or sending unit? how to tell?


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should be a grey wire going to the top of fuel tank connects to fuel guage / when the guage in the tank reads grounded it shows full , no ground it shows empty. if you ground that grey wire and the guage jumps to full then faulty guage if nothing maybe bad ground on the tank itself. the guages are a reostat like a tyco race car gun the more it moves the more it grounds .. good luck

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