GM Service Manual Online
For 1990-2009 cars only

ECM Scan Tool Output Controls

Scan Tool Output Control

Additional Menu Selection(s)

Description

Fan Relay 1

Output Control/Cooling Fan

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

Fan Relays 2 and 3

Output Control/Cooling Fan

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

Fan Relays 1, 2, & 3

Output Control/Cooling Fan

The ECM energizes all of the cooling fan relays when you select ON.