Engine Controls - Tests W/Codes - Diesel: Introduction

The Diesel Electronic Control (DEC) system, on the 6.2L with light duty emissions, electronically controls EGR system operation, Torque Converter Clutch (TCC) engagement, cold advance and glow plug operation.

Most engine control problems are NOT computer related, but result from mechanical breakdowns, poor electrical connections or damaged vacuum hoses. Before condemning the computer system, carefully perform visual and mechanical inspections. Failure to perform these inspections can result in lost diagnostic time.