GM Service Manual Online
For 1990-2009 cars only

Powertrain Control Module (PCM)

Scan Tool Output Control

Additional Menu Selection(s)

Description

Engine Hot Lamp

Dash Lamps

The Powertrain Control module (PCM) illuminates the hot coolant indicator when you select On. The hot coolant indicator will remain illuminated until commanded Off.

Fans Low Speed

Fan Relays

The scan tool displays a Commanded State of None, Off or On. This allows you to communicate with the PCM and activate or deactivate the cooling fan 1 relay, manually turning the low speed fans On and Off.

Fans High Speed

Fan Relays

The scan tool displays a Commanded State of None, Off or On. This allows you to communicate with the PCM to activate or deactivate the cooling fan 1 relay, manually turning the low speed fans On. After a 3 second delay the PCM will activate the cooling fan S/P relay and the cooling fan 2 relay. This turns the high speed fans On and Off.