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 MANUALSCADILLAC1998SEVILLE SLS V8-4.6L VIN YREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULEDESCRIPTION AND OPERATIONPOWERTRAIN CONTROL MODULE (PCM)CLEARING DIAGNOSTIC TROUBLE CODES
1998 Cadillac Seville SLS V8-4.6L VIN Y
Clearing Diagnostic Trouble Codes
1998 Cadillac Seville SLS V8-4.6L VIN YSECTION Clearing Diagnostic Trouble Codes
Clearing Diagnostic Trouble Codes
Use a scan tool to clear DTCs from the PCM memory. Disconnecting the vehicle battery will also clear the PCM memory, however most other system memories will also be cleared. This is generally undesirable. Disconnecting the PCM solely for clearing DTCs is not recommended since this unnecessarily disturbs the connections. Before clearing DTCs the scan tool has the capability to save any data stored with the DTCs and then display that data at a later time, (refer to Capture Info). Capturing DTC Info (Capture Info) Once a problem has been corrected and verified it is a good idea to clear DTCs so that any future service work is not needlessly confused.
Many DTCs have complex running and setting conditions. Therefore, simply clearing DTCs and watching to see if the DTC sets again may not indicate whether a problem has been corrected. To verify a repair after it is complete, you must look up the test conditions and duplicate those conditions. If the DTC runs and passes, chances are good that the problem is fixed.
Use a scan tool to clear DTCs from the PCM memory. Disconnecting the vehicle battery will also clear the PCM memory, however most other system memories will also be cleared. This is generally undesirable. Disconnecting the PCM solely for clearing DTCs is not recommended since this unnecessarily disturbs the connections. Before clearing DTCs the scan tool has the capability to save any data stored with the DTCs and then display that data at a later time, (refer to Capture Info). Capturing DTC Info (Capture Info) Once a problem has been corrected and verified it is a good idea to clear DTCs so that any future service work is not needlessly confused.
Many DTCs have complex running and setting conditions. Therefore, simply clearing DTCs and watching to see if the DTC sets again may not indicate whether a problem has been corrected. To verify a repair after it is complete, you must look up the test conditions and duplicate those conditions. If the DTC runs and passes, chances are good that the problem is fixed.
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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.