GM Service Manual Online
For 1990-2009 cars only

Powertrain Control Module (PCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition On/Engine Idling at normal operating temperature/Transmission in Park or Neutral/Cruise Control On/Off switch Off.

Brake Switch

Idle/Speed Control

General Info -- Inputs

Applied/Released

Released

Cruise Brake Switch

Idle/Speed Control

General Info -- Inputs

Applied/Released

Released

Cruise Engaged

Idle/Speed Control

General Info -- Inputs

Yes/No

No

Cruise Resume/Accel

Idle/Speed Control

General Info -- Inputs

On/Off

Off

Cruise Set/Coast

Idle/Speed Control

General Info -- Inputs

On/Off

Off

Cruise Switch

Idle/Speed Control

General Info -- Inputs

On/Off

Off

Engine Speed

Idle/Speed Control

General Info -- Inputs

RPM

Varies

Ignition 1

Idle/Speed Control

General Info -- Inputs

Volts

Varies

Vehicle Speed

Idle/Speed Control

General Info -- Inputs

km/h (mph)

0 km/h (0 mph)