Engine Controls - System/Component Tests: Introduction

Before testing separate components or systems, perform procedures in articles listed below:

• BASIC TESTING - 4-CYL
• BASIC TESTING - V6

Since many computer-controlled and monitored components set a diagnostic trouble code if they malfunction, also perform procedures in articles listed below:

• TESTS W/CODES - 4-CYL
• TESTS W/CODES - V6
  NOTE: Testing individual components does not isolate shorts or opens. Perform all voltage tests with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use ohmmeter to isolate wiring harness shorts or opens.
  NOTE: When testing some systems, tachometer may be required. Tachometer must be connected to proper terminals. For tachometer connections, see IDLE SPEED & MIXTURE in articles listed below:
• ADJUSTMENTS - 4-CYL
• ADJUSTMENTS - V6