Engine Control System & Engine Component Tests - Gasoline: Introduction

Before testing separate components or systems, perform procedures in BASIC DIAGNOSTIC PROCEDURES - RAM PICKUP, RAM VAN & RAM WAGON - GASOLINE article. Since many computer-controlled and monitored components set a Diagnostic Trouble Code (DTC) if they malfunction, also perform procedures in appropriate SELF-DIAGNOSTICS article.

Before testing separate components or systems, follow proper workflow. See SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article. If no Diagnostic Trouble Codes (DTCs) are present and a no start condition exists, proceed to BASIC DIAGNOSTIC PROCEDURES - RAM PICKUP, RAM VAN & RAM WAGON - GASOLINE article. If no DTCs are present and a driveability condition exists, proceed to TROUBLE SHOOTING - NO CODES - RAM PICKUP, RAM VAN & RAM WAGON - CNG & GASOLINE article for diagnosis by symptom (i.e., ROUGH IDLE, ENGINE STALLS, etc.).

NOTE: Testing individual components does not isolate possible short or open circuits. Unless stated otherwise in test procedure, perform all voltage tests with a Digital Volt-Ohmmeter (DVOM) having a minimum 10-megohm input impedance. Use ohmmeter to isolate wiring harness short or open circuits.

NOTE: Throughout this article, models with Calif. emissions may be referred to as Calif. models. Models with Federal emissions may be referred to as Federal models.