BodybyFisher Posted June 23, 2009 Report Share Posted June 23, 2009 I have a 2002 Monte Carlo, the gas gauge has been wacky for a couple of years, it pins itself to FULL, when the key is on. Today I lifted the trunk carpet, removed the fuel pump inspection cover and cleaned the connections at the fuel pump. Even with the connections OFF the fuel pump altogether the gauge still pins itself on FULL. Does anyone have the fuel pump/fuel gauge wiring diagrams? I think this is either the wiring grounded out someplace or a bad gauge itself. I plan to take the instrument cluster out and check the connections at the IPC/gauge Thanks, Mike Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
JimD Posted June 23, 2009 Report Share Posted June 23, 2009 Mike: I do not have diagrams or any specific information on how Chevrolet handles the float level information. But you can bet there will be at least one and possibly several modules involved with damping the level surges on corners. Then you can add the possible LOW FUEL LEVEL messages and chimes. But the likely culprit is the sending unit that is part of the pump assembly. If you can access and remove the pump from the top (trunk), I would remove the pump and examine the variable resistor that is controlled by the float. It is possible the variable resistor is damaged or coated with high sulphur fuel (has the car lived in FL?). Cleanup might be all that is needed. The electrical connector at the pump probably has a 4 or 5 pin connector. The two largest diameter pins will be DC power for the pump motor. The other pins will be the variable resistor. You should be able to see a resistance change on the "other" pins when you (gently) move the float. Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
Bruce Nunnally Posted June 24, 2009 Report Share Posted June 24, 2009 It may depend on whether the 3.4L or 3.8L engine but here is an electronic diagram for an 02 Monte Carlo fuel pump Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
BodybyFisher Posted June 24, 2009 Author Report Share Posted June 24, 2009 Thanks a lot Bruce! Its a 3.4L engine. I am hoping for a bad ground Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
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