GM Service Manual Online
For 1990-2009 cars only
Table 1: Heating and Air Conditioning Scan Tool Data List
Table 2: PCM Scan Tool Data List

Heating and Air Conditioning 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 21°C (70°F)

A/C LED On

HVAC

On/Off

On

A/C Request

HVAC

No/Yes

Yes

Air Mix Door Actual

HVAC

Counts

195  Counts

Air Mix Door Commanded

HVAC

Counts

197  Counts

Blower Motor PWM Speed

HVAC

Percentage

0-96%

Inside Air Temperature

HVAC

°C/°F

21°C/70°F

Lower Outlet Temperature

HVAC

°C/°F

21°C/70°F

Mix Door Max. Position

HVAC

Counts

197  Counts

Mix Door Min. Position

HVAC

Counts

53 Counts

Mode Selection Position

HVAC

AUTO

UPPER OUTLETS

BI-LEVEL

FLOOR

DEFOG

DEFROST

BI-LEVEL

Outside Air Temperature

HVAC

°C/°F

21°C/70°F

Rear Defog Switch

HVAC

On/Off

Off

Select Solenoid 1

HVAC

On/Off

Off

Select Solenoid 2

HVAC

On/Off

Off

Select Solenoid 3

HVAC

On/Off

On

Select Solenoid 4

HVAC

On/Off

Off

Select Solenoid 5

HVAC

On/Off

On

Solar Sensor

HVAC

Counts

100-245  Counts

Upper Outlet Temperature

HVAC

°C/°F

21°C (70°F)

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 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

Open/Closed

Closed

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