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2002 Monte Carlo


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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

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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

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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

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