GM Service Manual Online
For 1990-2009 cars only

Powertrain Control Module (PCM) Scan Tool Data List

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition Switch in RUN/Engine Running/Automatic Transmission in PARK/Manual Transmission in NEUTRAL/Air Conditioner is OFF

Blower Motor

Aux. Data Display

Volts

Varies

Desired Blower Motor

Aux. Data Display

Volts

Varies

DTC Set This Ignition

Aux. Data Display

Yes/No

Varies

ECT Sensor

Engine Data 1/Engine Data 2

Degrees

87°C (189°F)

ECT Sensor (6.5L)

Engine Data 1

Volts

2-3 Volts

Flame Temperature Sensor

Aux. Data Display

Volts

Varies

Flame Temperature Sensor

Aux. Data Display

C°F°

Varies

Fuel Pump PWM

Aux. Data Display

Ms

Varies

Glow Plug

Aux. Data Display

%

Varies

Ignition 1 Signal

Aux. Data Display

Volts

Varies

Over Temperature Sensor

Aux. Data Display

Volts

Varies

Temperature Sensor

Aux. Data Display

Volts

Varies

System Voltage High

Aux. Data Display

On/Off

Varies

System Voltage Low

Aux. Data Display

On/Off

Varies