Engine Maintenance and Questions Guide
Just to let you know…
If your check engine light comes on, there is no need to panic right away!
When the ignition switch is initially turned on and the engine is not running, the malfunction indicator lamp lights for a bulb check. While the engine is running, the MIL will light only if there is an emissions-related concern.
The onboard diagnostic (OBD) generation II system continuosly monitors all engine and transmission sensors and actuators looking for electrical faults, as well as values that do not logically fit with other powertrain data. When certain operating conditions are met and a comprehensive monitor detects a failure that will result in emissions exceeding a predetermined level, the computer stores a diagnostic trouble code and illuminates the MIL.
The onboard diagnostic II system also actively tests some systems for proper operation while the vehicle is being driven. Fuel control and engine misfire are checked continuosly, catalyst efficiency, exhaust gas recirculation operation, evaporative system integrity, oxygen sensor response and oxygen sensor heaters are tested once per trip when prerequisite operating conditions are met. The computer will illuminate the MIL if during these prerequisite operating conditions the system detects a failure that will result in emissions exceeding a predetermined level.
Whenever an engine misfire severe enough to damage the catalytic converter is detected, the MIL will blink on and off.
Once lit, the MIL will remain on until the vehicle has completed three consecutive good trips. The MIL is also turned off when stored diagnostic codes are cleared. However, the MIL will only remain off if the fault is successfully repaired.
When the ignition switch is initially turned on and the engine is not running, the malfunction indicator lamp lights for a bulb check. While the engine is running, the MIL will light only if there is an emissions-related concern.
The onboard diagnostic (OBD) generation II system continuosly monitors all engine and transmission sensors and actuators looking for electrical faults, as well as values that do not logically fit with other powertrain data. When certain operating conditions are met and a comprehensive monitor detects a failure that will result in emissions exceeding a predetermined level, the computer stores a diagnostic trouble code and illuminates the MIL.
The onboard diagnostic II system also actively tests some systems for proper operation while the vehicle is being driven. Fuel control and engine misfire are checked continuosly, catalyst efficiency, exhaust gas recirculation operation, evaporative system integrity, oxygen sensor response and oxygen sensor heaters are tested once per trip when prerequisite operating conditions are met. The computer will illuminate the MIL if during these prerequisite operating conditions the system detects a failure that will result in emissions exceeding a predetermined level.
Whenever an engine misfire severe enough to damage the catalytic converter is detected, the MIL will blink on and off.
Once lit, the MIL will remain on until the vehicle has completed three consecutive good trips. The MIL is also turned off when stored diagnostic codes are cleared. However, the MIL will only remain off if the fault is successfully repaired.
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