GM Service Manual Online
For 1990-2009 cars only

The Transmission Scan Tool Data List contains all Transmission related parameters that are available on the scan tool. The list is arranged in alphabetical order.

Use the Transmission Scan Tool Data List only after performing the following inspections:

    • Powertrain On-Board Diagnostic System Check is completed.
    • No Diagnostic Trouble Codes (DTCs) are present.
    • On-board diagnostics are functioning properly.

Scan tool values from a properly running Transmission may be used for comparison with the Transmission you are diagnosing. The Transmission Scan Tool Data List represents values that would be seen on a normal running engine.

Important: Do not use a scan tool that displays faulty data. Report the scan tool problem to the manufacturer. Use of a faulty scan tool can result in misdiagnosis and unnecessary parts replacement.

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

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

Air Conditioning

Engine Data

On/Off

Off

BARO

Engine Data

kPa

89 to 99 kPa (varies with the barometric pressure and altitude)

Battery Voltage

Engine Data

Volts

14 Volts

Closed Throttle Switch

Engine Data

Idle/Not Idle

Idle

Current Gear

Transmission Data

3rd

3rd

Desired Idle Speed

Engine Data

RPM

875 RPM

Electrical Load Signal

Engine Data

Yes/No

Yes

Engine Speed

Engine Data

RPM

850 to 900 RPM

ECT

Engine Data

C°/F°

80-90°C / 176-194°F

Engine Coolant Fan

Engine Data

On/Off

Off

Engine Load

Engine Data

%

10 to 18%

Fuel Cutoff Signal

Engine Data

Yes/No

No

Fuel Pump

Engine Data

On/Off

On

IAC Duty Cycle

Engine Data

%

17% to 30%

IAT

Engine Data

C°/F°

Varies with the underhood and ambient temperature

Loop Status

Engine Data

Open/Closed

Closed Loop

MAP (pressure)

Engine Data

kPa

26 to 51 kPa (varies with barometric pressure and altitude)

MAP (voltage)

Engine Data

Volts

1.30 to 1.90 Volts (varies with barometric pressure and altitude)

Monitor Shift Sol. 1

Transmission Data

On/Off

Off

Monitor Shift Sol. 2

Transmission Data

On/Off

Off

PNP (A/T only)

Transmission Data

P-N/R-D-L

P-N

Shift Solenoid 1

Transmission Data

On/Off

Off

Shift Solenoid 2

Transmission Data

On/Off

Off

Throttle Position Level

Engine Data

0

0

TP Sensor

Engine Data

Volts

0.50 to 0.80 Volts

TP Angle

Engine Data

%

10%

Transmission Range

Transmission Data

Park

Park

Vehicle Speed

Engine Data

km/h/MPH

0 km/h