Manual sections Wiring diagrams
Repair manual

Testing & Diagnostics GMC C3500 HD

Step-by-step instructions on "Testing & Diagnostics" for GMC C3500 HD (1991–2000). Pick an article — removal, installation, adjustment and diagnostics with illustrations.

Engine Controls - Tests W/o Codes - Gasoline

Engine Controls - Tests W/codes - 6.5L Diesel

Engine Controls - Tests W/o Codes - 6.5L Diesel

Engine Controls - Basic Testing - 6.5L Diesel

Engine Controls - System/component Tests - 7.4L

Engine Controls - Basic Testing - 7.4L

Engine Controls - Tests W/codes - 7.4L