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 MANUALSOLDSMOBILE1998EIGHTY-EIGHT LSREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEMS TESTS W/CODESDIAGNOSTIC TROUBLE CODESDTC P0230 - FUEL PUMP CONTROL CIRCUITDIAGNOSTIC PROCEDURES
1998 Oldsmobile Eighty-Eight LS
Diagnostic Procedures
1998 Oldsmobile Eighty-Eight LSSECTION Diagnostic Procedures
- Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then go to next step.
- Disconnect fuel pump relay. Connect a test light between fuel pump relay connector cavities for fuel pump relay control circuit and relay ground. Install scan tool. Turn ignition on, with engine off. Using scan tool, command fuel pump relay on and off. If test light illuminates when fuel pump is commanded on, go to step 7). If test light does not illuminate when fuel pump is commanded on, go to next step.
- Turn ignition off. Disconnect PCM harness connector. Using test light connected to battery voltage, probe fuel pump relay control circuit at PCM connector. If test light illuminates, go to step 9). If test light does not illuminate, go to next step.
- Using test light connected to battery voltage, probe fuel pump relay ground circuit. If test light illuminates, go to next step. If test light does not illuminate, go to step 10).
- Check for open in fuel pump relay control circuit between PCM and fuel pump relay. Repair as necessary. After repairs, go to step 14). If circuit is okay, go to next step.
- Check fuel pump relay control circuit for poor terminal connection at PCM. Repair as necessary. After repairs, go to step 14). If circuit is okay, go to step 12).
- Turn ignition off. Disconnect PCM harness connector. Turn ignition on, with engine off. Using test light connected to ground, probe fuel pump relay control circuit at PCM connector. If test light illuminates, go to step 13). If test light does not illuminate, go to next step.
- Check for poor terminal connection at fuel pump relay connector. Repair as necessary. After repairs, go to step 14). If connections are okay, go to step 11).
- Locate and repair short to ground in fuel pump relay ground circuit. After repairs, go to step 14).
- Locate and repair open in fuel pump relay ground circuit. After repairs, go to step 14).
- Replace fuel pump relay. After replacing relay, go to step 14).
- Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to step 14).
- Locate and repair short to voltage in fuel pump control circuit. After repairs, go to next step.
- Using scan tool, select DTC, CLEAR INFO function. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step 2).
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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.