Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCADILLAC1997SEVILLE SLS V8-4.6L VIN YREPAIR AND DIAGNOSISBODY AND FRAMEBODY CONTROL SYSTEMSBODY CONTROL MODULEDESCRIPTION AND OPERATIONBODY CONTROL SYSTEM CIRCUIT DESCRIPTIONFUEL LEVEL SENSING
1997 Cadillac Seville SLS V8-4.6L VIN Y
Fuel Level Sensing
1997 Cadillac Seville SLS V8-4.6L VIN YSECTION Fuel Level Sensing
The PZM calculates fuel level and sends a serial data message to the IPC and PCM indicating fuel level. The IPC receives "filtered" data to account for fuel slosh except while the computer system is in "service" mode (On-Board Diagnostics). The PCM Always receives "unfiltered" data. The fuel level is calculated as a ratiometric reading between the fuel level sensor and an Ignition 1 reference voltage. By using this method, changes in system voltage will have no effect on fuel level. The PZM sends changes in fuel level information to the IPC each time there is a change of at least five tenths of a liter. The PZM sends changes in fuel level information to the PCM each time there is a change of at least one liter.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.