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 SYSTEMSDESCRIPTION AND OPERATIONPOWERTRAIN CONTROL MODULE (COMMON OBD II SYSTEMS)MALFUNCTION INDICATOR LAMP (MIL)
1998 Chevrolet Metro L4-079 1.3L VIN 2 MFI
Malfunction Indicator Lamp (MIL)
1998 Chevrolet Metro L4-079 1.3L VIN 2 MFISECTION Malfunction Indicator Lamp (MIL)
The malfunction indicator lamp (MIL) looks the same as the MIL you may already be familiar with (Service Engine Soon or Check Engine). OBD 2 regulations require that the MIL illuminate according to a strict set of guidelines. Under OBD 2 the MIL is illuminated when the PCM detects a malfunction that will impact the vehicle emissions.
The MIL is controlled by the PCM. The MIL will be illuminated if an emissions-related diagnostic test indicates a malfunction has occurred. The MIL will stay illuminated until the system or the component passes the same test for three consecutive trips.
A vehicle that is experiencing a misfire malfunction that may cause damage to the three-way catalytic converter (TWC) will flash the MIL once per second. The MIL will continue to flash once per second until the vehicle is outside of the, speed and the load conditions that may cause damage to the TWC catalyst. The MIL will stop flashing and remain on steady once the vehicle is outside of the speed and the load conditions that may cause damage to the TWC catalyst.
The MIL is controlled by the PCM. The MIL will be illuminated if an emissions-related diagnostic test indicates a malfunction has occurred. The MIL will stay illuminated until the system or the component passes the same test for three consecutive trips.
A vehicle that is experiencing a misfire malfunction that may cause damage to the three-way catalytic converter (TWC) will flash the MIL once per second. The MIL will continue to flash once per second until the vehicle is outside of the, speed and the load conditions that may cause damage to the TWC catalyst. The MIL will stop flashing and remain on steady once the vehicle is outside of the speed and the load conditions that may cause damage to the TWC catalyst.
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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.