Cavalier L4-2.2L VIN F (2004)
Malfunction Indicator Lamp: Description and Operation
MALFUNCTION INDICATOR LAMP
The malfunction indicator lamp (MIL) is located in the instrument panel cluster. The MIL will display as either "SERVICE ENGINE SOON" or one
of the following symbols when commanded ON:
The MIL indicates that an emissions related fault has occurred and vehicle service is required.
The following is a list of the modes of operation for the MIL:
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The MIL illuminates when the ignition is turned "ON", with the engine "OFF". This is a bulb test to ensure the MIL is able to illuminate.
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The MIL turns "OFF" after the engine is started if a diagnostic fault is not present.
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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.
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The MIL flashes if the control module detects a misfire condition which could damage the catalytic converter.
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When the MIL is illuminated and the engine stalls, the MIL will remain illuminated as long as the ignition is "ON".
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When the MIL is not illuminated and the engine stalls, the MIL will not illuminate until the ignition is cycled "OFF" and then "ON".
SERVICE VEHICLE SOON
The instrument panel cluster (IPC) illuminates the service vehicle soon indicator during any of the following conditions:
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The body control module (BCM) detects a PASSLOCK failure. The BCM sends a class 2 message to the IPC requesting illumination.
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The BCM detects a malfunction in the passive trunk release system. The BCM sends a class 2 message to the IPC requesting illumination.
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The BCM detects a failure in the traction control system. The BCM sends a class 2 message to the IPC requesting illumination.
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The IPC detects a mismatch between its part number and the vehicle platform configuration sent by the BCM via a class 2 message.
