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 DIAGNOSISRELAYS AND MODULESRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULEDESCRIPTION AND OPERATIONPOWERTRAIN CONTROL MODULEPCM POWER-DOWN ROUTINE
2000 Saturn LW1 L4-2.2L VIN F
PCM Power-Down Routine
2000 Saturn LW1 L4-2.2L VIN FSECTION PCM Power-Down Routine
After ignition has been turned Off, PCM updates records such as malfunction history and adaptives prior to powering down. If PCM is commanding coolant fan On as a result of elevated coolant temperature, this routine will wait until timed fan run-on is completed (approximately 2 minutes). The actual power-down routine will complete within 10 seconds. If PCM is being reprogrammed (flashed), PCM will stay alive until reprogramming is complete.
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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.