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 L4-2.2L VIN FREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDESCRIPTION AND OPERATIONINFORMATION SENSORS/SWITCHSOUTPUT DRIVER MODULE (ODM)
2000 Saturn LW1 L4-2.2L VIN F
Output Driver Module (ODM)
2000 Saturn LW1 L4-2.2L VIN FSECTION Output Driver Module (ODM)
The Powertrain Control Module (PCM) controls most components with electronic switches which complete a ground circuit when turned On. These switches are arranged in groups of seven, and are called an Output Driver Module (ODM), which can independently control up to seven outputs. Not all outputs are always used.
ODMs are fault protected. If a relay or solenoid is shorted, having very low or zero resistance, or if the control side of the circuit is shorted to voltage, too much current will flow into the PCM. The driver senses this and the output is turned Off or its internal resistance increases in order to limit the current flow and protect the PCM and the driver. The result is high output terminal voltage when it should be low. If the circuit from E+ to the component or if the component is open, or the control side of the circuit is shorted to ground, terminal voltage will be low. Either of these conditions is considered to be a driver fault.
When an output is On, the terminal is grounded and the voltage will normally be low. When an output is Off, the terminal voltage normally will be high.
Drivers also have a feedback line in order to indicate the presence of a current fault to the PCMs central processor. A Scan tool displays the status of the driver fault lines as:
Yes = Fault
No = OK
ODMs are fault protected. If a relay or solenoid is shorted, having very low or zero resistance, or if the control side of the circuit is shorted to voltage, too much current will flow into the PCM. The driver senses this and the output is turned Off or its internal resistance increases in order to limit the current flow and protect the PCM and the driver. The result is high output terminal voltage when it should be low. If the circuit from E+ to the component or if the component is open, or the control side of the circuit is shorted to ground, terminal voltage will be low. Either of these conditions is considered to be a driver fault.
When an output is On, the terminal is grounded and the voltage will normally be low. When an output is Off, the terminal voltage normally will be high.
Drivers also have a feedback line in order to indicate the presence of a current fault to the PCMs central processor. A Scan tool displays the status of the driver fault lines as:
Yes = Fault
No = OK
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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.