Extinguishing the MIL

When the MIL is ON, the diagnostic executive will turn OFF the MIL after 3 consecutive trips that a test passed has been reported for the diagnostic test that originally caused the MIL to illuminate. Although the MIL has been turned OFF, the DTC will remain in the ECM memory, both Freeze Frame and Failure Records, until 40 warm-up cycles after no faults have been completed.

If the MIL was set by either a fuel trim or misfire-related DTC, additional requirements must be met. In addition to the requirements stated in the previous paragraph, these requirements are as follows:

• The diagnostic tests that are passed must occur with 375 RPM of the RPM data stored at the time the last test failed.
• Plus or minus 10 percent of the engine load that was stored at the time the last test failed. Similar engine temperature conditions, warmed up or warming up, as those stored at the time the last test failed.

Meeting these requirements ensures that the fault which turned ON the MIL has been corrected.