GM Service Manual Online
For 1990-2009 cars only
Table 1: Engine Control Module (ECM)
Table 2: Powertrain Control Module (PCM)

Engine Control Module (ECM)

Scan Tool Output Control

Additional Menu Selection(s)

Description

GEN L Terminal

Engine Output Controls

The ECM commands the generator Off when you select Off. The Generator will stop generating an output voltage.

Starter Relay

Engine Output Controls

Commands starter relay On and Off.

Powertrain Control Module (PCM)

Scan Tool Output Control

Additional Menu Selection(s)

Description

GEN L Terminal

Engine Output Controls

The PCM commands the generator Off when you select Off. The Generator will stop generating an output voltage.