ML20 - "Check Engine" Message Displayed

NOTE: If vehicle will not start, perform Pinpoint Test AC1. AC1 - Attempt to Crank Engine

- Run Key On Engine Off Self-Test. Quick Test Appendix (Detailed Testing Instructions)

- Is result 111-10-111 (Pass Codes)?

Yes -- Go to Instrument Panel, Gauges, and Warning Indicators for diagnosis.

No -- Self-Test indicates a fault. Go to Diagnostic Trouble Code Charts. Manufacturer Code Charts