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 MANUALSSATURN2000LW1 AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM - BASIC DIAGNOSTIC PROCEDURESNO START DIAGNOSISNO START - ENGINE CRANKS OKAY (3.0L - CATERA)FUEL PUMP ELECTRICAL CIRCUIT
2000 Saturn LW1 Automatic
Fuel Pump Electrical Circuit
2000 Saturn LW1 AutomaticSECTION Fuel Pump Electrical Circuit
- Perform OBD system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. After performing OBD system check, go to next step.
- Connect scan tool. Crank engine for several seconds. Check for DTCs. If DTC P0230 is set, diagnose DTC first. See appropriate SELF-DIAGNOSTICS article. If DTC P0230 is no set, go to next step.
- Using test light connected to ground, probe fuel pump relay battery feed circuit at fuel pump relay harness. If test light illuminates, go to next step. If test light does not illuminate, go to step 12 .
- Ensure fuel pump relay is installed. Turn ignition on. Using test light connected to ground, probe fuel pump power feed circuit at fuel pump relay harness. Using scan tool, command fuel pump relay on and off. If test light turns on and off, go to next step. If test light does not turn on and off, go to step 14 .
- Check FUEL PUMP fuse (20-amp) located in fuse block. If fuse is open, go to step 11 . If fuse is okay, go to next step.
- Install FUEL PUMP fuse. Turn ignition on. Using scan tool, command fuel pump relay on. Using test light connected to ground, probe each side of FUEL PUMP fuse. If test light illuminates on each side of fuse, go to next step. If test light does not illuminate on each side of fuse, go to step 12 .
- Turn ignition off. Disconnect fuel pump harness jumper connector. Using test light connected to ground, probe fuel pump power feed circuit at fuel pump harness. Turn ignition on. Using scan tool, command fuel pump relay on. If test light illuminates, go to next step. If test light does not illuminate, go to step 12 .
- Connect test light between fuel pump battery feed circuit and fuel pump ground circuit at fuel pump harness connector (vehicle side). Using scan tool, command fuel pump relay on. If test light illuminates, go to next step. If test light does not illuminate, go to step 13 .
- Check condition of circuits in fuel pump jumper harness, and check for poor harness connections at fuel pump and at jumper harness connector. Repair as necessary. After repairs, go to step 16 . If harness and connections are okay, go to next step.
- Ensure all harness connectors are connected. Turn ignition on. Using scan tool, command fuel pump relay on. If fuel pump runs, go to step 16 . If fuel pump does not run, go to step 15 .
- Repair short to ground in fuel pump power feed circuit. After repairs, go to step 16 .
- Repair open in fuel pump power feed circuit. After repairs, go to step 16 .
- Repair open in fuel pump ground circuit. After repairs, go to step 16 .
- Replace fuel pump relay. After repairs, go to step 16 .
- Replace fuel pump. After repairs, go to next step.
- Using scan tool, clear DTCs. Attempt to start engine. If engine starts, go to next step. If engine does not start, perform OBD system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article.
- Allow engine to idle and reach normal operating temperature. Using scan tool, check for DTCs. If any DTCs are set, diagnose DTCs. See appropriate SELF-DIAGNOSTICS article. If no DTCs are set, system is okay.
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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.