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MIL Lamp Strategy: Notes

I/M Readiness OK to test = Key On Engine OFF

MIL Lamp will remain on until the engine is started or Ignition is turned off.
I/M not ready for testing = Key On Engine OFF
MIL Lamp on solid for (15) seconds then MIL Lamp will flash on/off for (5) seconds then it will remain on until the vehicle is started or the Ignition is turned off.

Fig 1: MIL Lamp Strategy
Courtesy of DAIMLERCHRYSLER CORP.