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Wiring diagrams Section: Testing & Diagnostics

Engine Controls Self-Diagnostics - 4.3L

Engine Control System Self-Diagnostics - 4.8L, 5.3L & 6.0L

Engine Control System Self-Diagnostics - 8.1L "C", "G" & "K" Series Trucks

Engine Controls - Strategy Based Engine Diagnosis

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Engine Controls - System & Component Testing: Wiring Chevrolet Silverado 2500

Testing & Diagnostics

PCM Harness Resistance

Turn ignition switch to LOCK position. Disconnect PCM and appropriate component harness connectors. Check for open or short circuits between appropriate PCM harness connector terminal and appropriate component harness connector terminal. See WIRING DIAGRAMS article. If harness is open or shorted, repair as necessary.