Engine Controls - Tests W/Codes: Introduction

If no faults were found while performing BASIC DIAGNOSTIC PROCEDURES, proceed with self-diagnostics. If no fault codes, or only pass codes, are displayed after entering self-diagnostics, proceed to TESTS W/O CODES article in the ENGINE PERFORMANCE Section for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.).

This article uses many abbreviations for devices, signal names, and wire colors. See SELF-DIAGNOSTICS ABBREVIATIONS table. Abbreviations for wire colors in individual PINPOINT TEST diagrams are as follows:

• BLK - Black
• BLU - Blue
• BRN - Brown
• GRN - Green
• LT GRN - Light Green
• ORG - Orange
• PNK - Pink
• RED - Red
• WHT - White
• YEL - Yellow