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 Engine running,A/C On, mode selector in Bi-Level and in recirculation mode outside air temperature at 21°C (70°F)

A/C Clutch Feedback Signal (4.3L only)

Engine Data 2

On/Off

Off

A/C Compressor Cycling Switch (4.3L only)

Engine Data 2

Normal/Low pressure

Normal

A/C High Side Pressure (2.2L only)

Engine Data 2

kPa/psi

420 kPa/61 psi

A/C High Side Pressure (2.2L only)

Engine Data 2

Volts

0.8 Volts

A/C Relay Command

Engine Data 1

Engine Data 2

Engine Data 3 (2.2L only)

On/Off

On

A/C Request Signal

Engine Data 2

Yes/No

Yes

A/C High Pressure Recirculation Switch (4.3L only)

Engine Data 2

Open/Closed

Closed