GM Service Manual Online
For 1990-2009 cars only
Table 1: HVAC Scan Tool Data List
Table 2: PCM Scan Tool Data List

HVAC Scan Tool Data List

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Engine Idling/Radiator Hose Hot/Closed Throttle/Park or Neutral/Closed Loop

ROM ID

Module Info

ID Number

Varies

Calibration ID

Module Info

Calibration Number

Varies

ROM Part Number

Module Info

Part Number

Varies

Rear Defog Output

Data

On/Off

Off

Vacuum Solenoid 1

Data

On/Off

Varies

Vacuum Solenoid 2

Data

On/Off

Varies

Vacuum Solenoid 3

Data

On/Off

Varies

Vacuum Solenoid 4

Data

On/Off

Varies

Vacuum Solenoid 5

Data

On/Off

Varies

Sunload Sensor

Data

0-5 Volts

Varies

Outside Temp Sensor

Data

0-5 Volts

Varies

Inside Temp Sensor

Data

0-5 Volts

Varies

Desired Blower Motor Speed

Data

0-111 Counts

Varies

Driver Temp Dial

Data

°F/°C

Varies

Passenger Temp Dial

Data

26-80 Counts

Varies

LH Mix Mtr Position Feedback

Data

0-225 Counts

Varies

RH Mix Mtr Position Feedback

Data

0-225 Counts

Varies

LH Mix Mtr Position Requested

Data

0-225 Counts

Varies

RH Mix Mtr Position Requested

Data

0-225 Counts

Varies

Mix Mtr State

Data

LH and RH Electric Actuator state

Normal

Auto Button

Inputs

On/Off

Off

Front Defrost Button

Inputs

On/Off

Off

Off Button

Inputs

On/Off

Off

Rear Defrost Button

Inputs

On/Off

Off

Recirculate Button

Inputs

On/Off

Off

Fan Up Button

Inputs

On/Off

Off

Fan Down Button

Inputs

On/Off

Off

A/C Button

Inputs

On/Off

Off

Outside Air Button

Inputs

On/Off

Off

Mode Button

Inputs

On/Off

Off

PCM Scan Tool Data List

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Engine Idling/Radiator Hose Hot/Closed Throttle/Park or Neutral/Closed Loop

A/C Relay Command

Eng 1, 2, Enhanced EVAP, Misfire

On/Off

Off

A/C High Side Pressure

Eng 2

Volts

Varies

A/C High Side Pressure

Eng 2

kPa/psi

Varies

A/C Request

Eng 1, 2, Enhanced EVAP, Misfire

Yes/No

No

A/C Status

Eng 1, 2, Enhanced EVAP, Misfire

On/Off

Off