GM Service Manual Online
For 1990-2009 cars only

Engine Control Module (ECM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition On/Engine Idling at Normal Operating Temperature/Transmission in Park or Neutral/Cruise Control On/Off switch Off.

Cruise Control Active

Cruise Control Data

Yes/No

No

Cruise Disengage 1-6 History

Cruise Control Data

The last reason for cruise control disengagement

Varies

Cruise Mode Signal

Cruise Control Data

Volts

0.0 Volts

Cruise On/Off Switch

Cruise Control Data

On/Off

Off

Cruise Resume/Accel. Switch

Cruise Control Data

On/Off

Off

Cruise Set/Coast Switch

Cruise Control Data

On/Off

Off

Engine Speed

Cruise Control Data

RPM

Varies

Ignition 1 Signal

Cruise Control Data

Volts

Varies

Reduced Engine Power

TAC Data

Active/Inactive

Inactive

Stoplamp Pedal Switch

Cruise Control Data

Applied/Released

Released

Stoplamp Pedal Switch Signal

Cruise Control Data

Volts

0.0 Volts

TAC/PCM Communication Signal

TAC Data

Ok/Fault

Ok

TAC Stoplamp Pedal Switch

Cruise Control Data

Applied/Released

Released

TAC Vehicle Speed Signal

TAC Data

Ok/Fault

Ok

Traction Control Status (if equipped)

Cruise Control Data

Active/Inactive

Inactive

Vehicle Speed Circuit History

Output Driver Data

Ok/Open/Short/Invalid State

Ok

Vehicle Speed Circuit Status

Output Driver Data

Ok/Fault/Invalid State

Ok

Vehicle Speed Sensor

Cruise Control Data

km/h (mph)

0 km/h (0 mph)