Question about 1990 GMC Sierra
Posted by Anonymous on
Hello lets start by checking the fuse, panel located left of the drivers knee just up under Te dash the fuse panel has numbered and branded identified gauges/cigarette lighter etc.when you find the gauges fuse remove it and examine should see the loop in the center blown replace with the same amp number such as 15amp.
Posted on Jan 03, 2011
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Posted on Jan 02, 2017
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Apr 04, 2017 | Cars & Trucks
Instrument cluster indicator control
Fuel gauge control
Temperature gauge control
A/C compressor request
A/C cooling fan
Exterior and interior lighting control for the following lamps:
Daytime Running Lights (DRL)
Automatic lighting 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
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The IPC detects a loss of class 2 communications with the PCM.
When the fuel level is less than 14 percent, the low fuel indicator illuminates.
The best place to start , instead of guessing , would be to hook up a GM factory scan tool ,Tech 2 scan tool ! This would be done to see if the PCM is receiving a voltage signal from the fuel sending unit in the fuel tank . An to see if it is sending a signal to the instrument cluster .
Don't get me wrong here , there are other ways to check it ! The PCM supply's the fuel sending unit with a 5 volt reference voltage , the sending unit is what they call a potentiometer ,with the level of the fuel , it will send back a voltage signal less then five volts . The PCM will know what the fuel level is by that voltage an send it to the I / P cluster . There are videos on you tube on how to check it ! You can go to radio shack or some other electronics store an purchase different resistors ,Then find connector C-413 C413 -- 16 cavity
Fuel tank/canister vent/wheel speed sensor harnesses to body harness, under the right rear of the vehicle, near front of the gas tank. We have a special tool here at the dealer ,a signal generator
Connect the J 33431-C Signal Generator and Instrument Panel Tester between the signal circuit and the low reference circuit of the fuel level sensor on the male terminal side.
Then install the resistors one at a time to check different fuel levels , one for 1/4 , 1/2 ,3/4 an full ! Good luck hope this helps
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