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 MANUALSSATURN2003ION 3 4D SEDAN, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM & COMPONENT TESTINGCOMPUTERIZED ENGINE CONTROLSENGINE CONTROL MODULEPOWER CIRCUITS
2003 Saturn Ion 3 4D Sedan, Standard
Power Circuits
2003 Saturn Ion 3 4D Sedan, StandardSECTION Power Circuits
- Using DVOM, check for battery voltage between ECM continuous power terminal(s) and ground. For connector terminal identification, see CONNECTOR IDENTIFICATION in SELF-DIAGNOSTICS - 2.2L ION article. See WIRING DIAGRAMS . If battery voltage is not present, check for open fuse or fusible link. If fuse or fusible link is okay, check for open in circuit between ECM continuous power terminal and power source.
- Turn ignition switch to RUN position. Using DVOM, check for battery voltage between ECM ignition power terminals and ground. If battery voltage is not present, check appropriate ECM power feed fuses. If fuse(s) is okay, check for open in circuit between battery and ignition switch, and between ignition switch and ECM ignition power terminal. If circuits are okay, check for defective ignition switch.
- Connect DVOM between ground and ECM starter (crank) signal terminal. On vehicles with manual transaxle, depress clutch pedal. On vehicles with automatic transaxle, place gearshift lever in Park. On all vehicles, turn ignition switch to START position. Battery voltage should be present only when ignition switch is in START position.
- If voltage is not present, check CRANK fuse or fusible link between ignition switch and ECM starter (crank) signal terminal. If fuse or fusible link is okay, check for open in circuit between ignition switch and ECM starter (crank) signal terminal, or check for defective ignition switch.
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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.