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

A/C Switch

Engine Data

On/Off

Off

Command A/C

Engine Data

On/Off

OFF

Diagnostic Mode

Engine Data

Normal/Check

Normal

ECT

Engine Data

C°/F°

80-90°C / 176-194°F

Electrical Load

Engine Data

Yes/No

No

Engine Load

Engine Data

%

19.7% to 49.3%

Engine Speed

Engine Data

RPM

650 to 750 RPM

Engine Speed at Misfire

Engine Data

RPM

0 RPM

Fuel Pump

Engine Data

On/Off

On

IAT

Engine Data

C°/F°

Varies with the underhood and ambient temperature

Load at Misfire

Engine Data

G/Rev

0.00 G/Rev

Loop Status

Engine Data

Open/Closed

Closed Loop

MAP (pressure)

Engine Data

kPa

28 to 47 kPa (varies with barometric pressure and altitude)

MAP (voltage)

Engine Data

Volts

1.32 to 2.20 Volts (varies with barometric pressure and altitude)

MIL Request By DTC

Engine Data

Yes/No

No

Overdrive

Transmission Data

On/Off

Off

PNP (A/T only)

Transmission Data

P-N/R-D-L

P-N

Powertrain DTC

Transmission Data

Counts

0

Shift Request

Transmission Data

1st

1st

Starter Switch

Engine Data

Released/Cranking

Released

TCC Brake Switch

Engine Data

Released/Applied

Released

TCC Solenoid

Transmission Data

On/Off

Off

TP Angle

Engine Data

%

8-11%

Vehicle Speed

Engine Data

km/h/MPH

0 km/h