Visual Inspection

This inspection will identify modifications or additions to the vehicle operating system that may affect diagnosis. Inspect the vehicle for:

• Add-on devices such as:
• Air conditioning.
• Generator.
• Engine turbo.
• Cellular telephone.
• Cruise control.
• CB radio.
• Linear booster.
• Backup alarm signal.
• Computer.
• Vehicle modification. These items, if not installed correctly, will affect the powertrain control module (PCM) or transmission function. Pay particular attention to add-on wiring splices in the PCM harness or transmission wiring harness, abnormal tire size, or axle ratio changes.