GM Service Manual Online
For 1990-2009 cars only

PCM Scan Tool Data List

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON, Engine OFF

A/C Compressor Cycling

Engine Data 2

Normal/Low

Normal

A/C Relay Command

Engine Data 1&2/Misfire Data

ON/OFF

Varies

A/C Request Signal

Engine Data 2/Misfire Data

Yes/No

Varies