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 MANUALSCHEVROLET1998METRO L4-079 1.3L VIN 2 MFIREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULEDESCRIPTION AND OPERATIONCOMMON OBD II SYSTEMSEXTINGUISHING THE MIL
1998 Chevrolet Metro L4-079 1.3L VIN 2 MFI
Extinguishing the MIL
1998 Chevrolet Metro L4-079 1.3L VIN 2 MFISECTION Extinguishing the MIL
The powertrain control module (PCM) will turn Off the malfunction indicator lamp (MIL) after three consecutive trips that a test passed has been reported for the diagnostic test that originally caused the MIL to illuminate.
The diagnostic trouble code (DTC) will remain in the PCM memory and the Freeze Frame record until forty (40) warm-up cycles have been completed and no faults exist.
An MIL that was illuminated by either a fuel-trim DTC or a misfire-related DTC has additional requirements that must be met in order to turn Off the MIL. The additional requirements are as follows:
^ The diagnostic tests that are passed must occur within 375 RPM of the RPM data stored at the time the last test failed.
^ The diagnostic tests that are passed must occur within ten percent of the engine load that was stored at the time the last test failed.
^ The diagnostic tests that are passed must occur at engine temperature conditions (warmed up or warming up) that are similar to those stored at the time the last test failed.
Meeting these requirements ensures that the fault which turned on the MIL has been corrected.
The diagnostic trouble code (DTC) will remain in the PCM memory and the Freeze Frame record until forty (40) warm-up cycles have been completed and no faults exist.
An MIL that was illuminated by either a fuel-trim DTC or a misfire-related DTC has additional requirements that must be met in order to turn Off the MIL. The additional requirements are as follows:
^ The diagnostic tests that are passed must occur within 375 RPM of the RPM data stored at the time the last test failed.
^ The diagnostic tests that are passed must occur within ten percent of the engine load that was stored at the time the last test failed.
^ The diagnostic tests that are passed must occur at engine temperature conditions (warmed up or warming up) that are similar to those stored at the time the last test failed.
Meeting these requirements ensures that the fault which turned on the MIL has been corrected.
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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.