ECU Indicator LED

If CHECK ENGINE light illuminates when engine is running, a system failure has been detected, and a corresponding trouble code has been set in ECU memory. Access ECU, located under carpet near passenger's side kick panel. Stored codes will be flashed by LED on ECU. To verify codes, see CHECK ENGINE LIGHT .

Not all trouble codes will activate CHECK ENGINE light. If CHECK ENGINE light is on and no codes are flashed by LED on ECU, this indicates that back-up system is in operation. See TESTS W/O CODES article.