Test Procedures: Notes

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Two different diagnostic modes are available through the ECCS. Diagnostic Mode I is used as a bulb check and as a malfunction warning. With ignition on and engine off, Mode II of self-diagnostic system is used for obtaining trouble codes for component or circuit failures. With engine running, Mode II is used for monitoring the air/fuel mixture ratio by using the Red LED on ECU or CHECK ENGINE light on dash panel.

NOTE: For additional information on self-diagnostic system, see TESTS W/CODES article.