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: Key ON Engine OFF mode selector in Bi-Level and in recirculation mode outside air temperature at 70° F/21° C

A/C Compressor Cycling Sw.

Engine Data 2

Open/Closed

Closed

A/C Relay Command

Engine Data 1/Engine Data 2/Misfire Data

On/Off

On

A/C Request Signal

Engine Data 2

Yes/No

Yes

A/C Sec. High Press. Sw.

Engine Data 2

Open/Closed

Closed