GM Service Manual Online
For 1990-2009 cars only
Table 1: Starter/Generator Control Module Scan Tool Data Parameters
Table 2: Starter/Generator Control Module Scan Tool Output Controls

Starter/Generator Control Module Scan Tool Data Parameters

Parameter

System State

Expected Value

Description

Operating Conditions: Ignition ON

APM Control Mode

--

Off

The scan tool displays Off, High to Low, Low to High or Not Used. This is the state of the auxiliary power module (APM) control mode.

APM Control Status

--

Charging

The scan tool displays Charging, Current Limited, Shutdown or Not Used. This is the auxiliary power module (APM) control status.

Desired APM Voltage

--

Varies

This displays Volts. This is the desired auxiliary power module (APM) voltage.

Generator Starter Field Current

--

Varies

This displays amps.

Generator Starter Field Current

--

Enable

The scan tool displays Enable or Disable. This is the current state of the generator starter field.

Hill Hold Solenoid 1

--

Varies

This displays %.

Hill Hold Solenoid 2

--

Varies

This displays %.

Hill Hold Solenoid Relay

--

Varies

This displays Enable or Disable. This is the current state of the hill hold solenoid relay.

Hood Position

--

Closed

The scan tool displays Open or Closed. This is the current position of the hood switch.

Hybrid System Voltage

--

Varies

This displays Volts. This is the current hybrid system voltage.

SGCM 12 Volt Converter

--

Varies

This displays amps.

SGCM Converter Temperature

--

Varies

This displays °C (°F). This is the current starter/generator control module (SGCM) converter temperature.

SGCM Internal Temperature

--

Varies

This displays °C (°F). This is the current starter/generator control module (SGCM) internal temperature.

SGCM Inverter Temperature

--

Varies

This displays °C (°F). This is the current starter/generator control module (SGCM) inverter temperature.

Starter Generator Speed

--

Varies

This displays RPM.

Starter Generator Temperature

--

Varies

This displays °C (°F).

Starter/Generator Control Module Scan Tool Output Controls

Output Control

Description

Brake Hold Sol. 1

This output control commands the brake hold solenoid 1 ON and OFF.

Brake Hold Sol. 2

This output control commands the brake hold solenoid 2 ON and OFF.

SGCM Field Current

This output control commands the starter/generator control module (SGCM) field current ON and OFF.