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 MANUALSCHEVROLET1999EXPRESS 1/2 TON VAN V6-4.3L VIN WREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESSCAN TOOL DIAGNOSTICSMALFUNCTION INDICATOR LAMP (MIL)
1999 Chevrolet Express 1/2 Ton Van V6-4.3L VIN W
Malfunction Indicator Lamp (MIL)
1999 Chevrolet Express 1/2 Ton Van V6-4.3L VIN WSECTION Malfunction Indicator Lamp (MIL)
The Malfunction Indicator Lamp (MIL) is on the instrument panel. The MIL has the following functions:
^ The MIL informs the driver that a fault that affects the emission levels of the vehicle has occurred. The owner should take the vehicle in for service as soon as possible.
^ As a bulb and system check, the Malfunction Indicator Lamp (MIL) comes ON with the key ON and the engine not running. When the engine is started, the MIL turns OFF if no DTCs are set.
When the MIL remains ON while the engine is running, or when a malfunction is suspected due to a driveability or emissions problem, perform an On-Board Diagnostic (OBD) System Check. The procedures for these checks are given in engine controls. These checks expose faults which the technician may not detect if other diagnostics are performed first.
^ The MIL informs the driver that a fault that affects the emission levels of the vehicle has occurred. The owner should take the vehicle in for service as soon as possible.
^ As a bulb and system check, the Malfunction Indicator Lamp (MIL) comes ON with the key ON and the engine not running. When the engine is started, the MIL turns OFF if no DTCs are set.
When the MIL remains ON while the engine is running, or when a malfunction is suspected due to a driveability or emissions problem, perform an On-Board Diagnostic (OBD) System Check. The procedures for these checks are given in engine controls. These checks expose faults which the technician may not detect if other diagnostics are performed first.
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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.