Section 79 (Engine Controls - System & Component Testing - 6.5L Turbo Diesel): Introduction

WARNING: This page is about a different car, the 1998 GMC Forward Control and 1998 Chevrolet Forward Control. However, it is still accessible from the selected car via links, so may be relevant.

Before testing separate components or systems, perform BASIC TESTING - 6.5L TURBO DIESEL article. Since many computer-controlled and monitored components set a trouble code if they malfunction, also perform procedures in TESTS W/CODES - 6.5L TURBO DIESEL article.

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 and refer to WIRING DIAGRAMS - 6.5L TURBO DIESEL to isolate wiring harness shorts or opens.