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.
2003 Saturn Ion 1 AutomaticFACTORY OEM SERVICE PROCEDURE
Sensor/System Checks
- Check for an Engine Coolant Temperature (ECT) sensor that has shifted in value. See TEMPERATURE VS. RESISTANCE table.
- Check for proper operation of the Manifold Absolute Pressure (MAP) sensor. See DTC P0106: MANIFOLD ABSOLUTE PRESSURE SYSTEM PERFORMANCE under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 2.2L ION article.
- Check for proper operation of the Throttle Position (TP) sensor. See DTC P0122: THROTTLE POSITION SENSOR CIRCUIT - LOW VOLTAGE or DTC P0123: THROTTLE POSITION SENSOR CIRCUIT - HIGH VOLTAGE under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 2.2L ION article.
- Check for proper operation of the Intake Air Control (IAC) valve. See IDLE AIR CONTROL SYSTEM under IDLE CONTROL SYSTEM in SYSTEM & COMPONENT TESTS - 2.2L ION article.
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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