GM Service Manual Online
For 1990-2009 cars only

PCM Scan Tool Output Controls

Scan Tool Output Control

Additional Menu Selection(s)

Description

Fans Low Speed

Engine Output Controls

The powertrain control module (PCM) or engine control module (ECM) energizes the cooling fan 1 relay when you select ON.

Fans High Speed

Engine Output Controls

The PCM/ECM energizes the cooling fan 2 and 3 relays when you select ON.