Question about 1998 Chevrolet Cavalier
Diagnostic test done when check engineLight illuminated. code P1004 shown. what does that mean?
Took a while to find it but looks like it is the Mass Air Flow sensor
Posted on Oct 01, 2009
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Posted on Jan 02, 2017
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Aug 18, 2015 | Cars & Trucks
The MIL turns OFF after the engine is started if a diagnostic fault is not present.
The MIL remains illuminated after the engine is started if the control module detects a fault. A diagnostic trouble code (DTC) is stored any time the control module illuminates the MIL due to an emissions related fault. The MIL turns OFF after three consecutive ignition cycles in which a Test Passed has been reported for the diagnostic test that originally caused the MIL to illuminate.
The MIL flashes if the control module detects a misfire condition which could damage the catalytic converter.
When the MIL is illuminated and the engine stalls, the MIL will remain illuminated as long as the ignition is ON.
When the MIL is not illuminated and the engine stalls, the MIL will not illuminate until the ignition is cycled OFF and then ON.
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