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Home >> Toyota >> 1990 >> Corolla DX, 4D Sedan, AWD, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - System/Component Tests >> Introduction
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Engine Controls - System/Component Tests: Introduction

NOTE: Prior to testing separate components or systems, it is highly recommended that all procedures listed in BASIC TESTING be performed. Since many computer controlled and monitored components will set a trouble code if they malfunction, it is also recommended that self diagnosis be performed. See TESTS W/CODES .
Fig 1: Location of Corolla ECU & Circuit Opening Relay
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