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Service Engine/Throttle Soon Light

As a bulb and system check, SERVICE ENGINE/THROTTLE SOON light glows when ignition switch is turned to ON position and engine is not running. When engine is started, light should go out. If light does not operate as described, malfunction has been detected in computerized engine control system or SERVICE THROTTLE SOON light circuit is faulty.

To verify proper operation of SERVICE THROTTLE SOON light and retrieve trouble codes on diesel models, see DIAGNOSTIC SYSTEM CHECK chart under DIAGNOSTIC CHARTS in appropriate G - DIESEL TESTS W/ CODES article in the ENGINE PERFORMANCE section.

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