GM Service Manual Online
For 1990-2009 cars only

Use the scan tool data list under the following conditions:

    • The Powertrain On-Board Diagnostic (OBD) System Check is complete.
    • The on-board diagnostics are functioning properly.
    • No DTCs are present.

The values below represent a typical display recorded from a properly functioning system.

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

Only the parameters listed below are used in this manual for diagnosing. If a scan tool displays other parameters, the values are not recommended by General Motors for use in diagnosis.

Scan tool values below were recorded under the following conditions:

    • Engine at idle
    • Upper radiator hose hot
    • Closed throttle
    • Transmission in PARK
    • Closed Loop operation
    • Accessories OFF
    • Brake pedal not applied

Transmission Scan Tool Data List

Scan Tool Parameter

Data List*

Units Displayed

Typical Data Value

1-2 Shift Error

F2, F7

Seconds

Varies

1-2 Shift Time

F0, F2, F7

Seconds

Varies

1-2 Sol.

F0, F2, F3, F4

On/Off

On

1-2 Sol. Open/Short to GND

F2

Yes/No

No

1-2 Sol. Short to Volts

F2

Yes/No

No

1-2 TAP Cell (4-16)

F7

kPa/Psi

Varies

2-3 Shift Error

F3, F8

Seconds

Varies

2-3 Shift Time

F0, F3, F8

Seconds

Varies

2-3 Sol.

F0, F2, F3, F4

On/Off

On

2-3 Sol. Open/Short to GND

F3

Yes/No

No

2-3 Sol. Short to Volts

F3

Yes/No

No

2-3 TAP Cell (4-16)

F8

kPa/Psi

Varies

3-2 Downshift Sol.

F0, F5

On/Off

On

3-2 Sol. Open/Short to GND

F5

Yes/No

No

3-2 Sol. Short to Volts

F5

Yes/No

No

3-4 Shift Error

F4

Seconds

Varies

3-4 Shift Time

F0, F4

Seconds

Varies

4WD

F0

Enabled/Disabled

Disabled

4WD Low

F0

Enabled/Disabled

Disabled

A/C Clutch

F0

On/Off

Off

Commanded Gear

F0, F1, F2, F3, F4, F5, F6

1, 2, 3, 4

1

Cruise

F0

Enabled/Disabled

Disabled

Current TAP Cell

F7, F8

4-16

Varies

ECT

F0, F1

°C (°F)

Varies

Engine Run Time

F0

Hr/Min/Sec

Varies

Engine Speed

F0, F1, F2, F3, F4, F5, F6

RPM

Varies

Engine Torque

F0, F1

N·m (lb ft)

Varies

Estimated Gear Ratio

F0, F1, F2, F3, F4

Ratio

8.00:1

Ignition Voltage

F0

Volts

12-14 Volts

Last Shift Time

F0

Seconds

Varies

P1870 Slip Counter

F0, F1

0, 1, 2

0

PC Sol. Actual Current

F0, F6

Amps

Varies (0.1-1.1 amps)

PC Solenoid Duty Cycle

F0, F6

Percent

Varies

PC Sol. Ref. Current

F0, F6

Amps

Varies (0.1-1.1 amps)

Power Take Off

F0

On/Off

On

Speed Ratio

F0, F1, F2, F3, F4, F5

Ratio

8.00:1

TCC Brake Switch

F0, F1

Open/Closed

Closed

TCC Duty Cycle

F0, F1

Percent

0%

TCC Duty Cycle Open/Short to GND

F1

Yes/No

No

TCC Duty Cycle Short to Volts

F1

Yes/No

No

TCC Enable

F0, F1

Yes/No

No

TCC Enable Open/Short to GND

F1

Yes/No

No

TCC Enable Short to Volts

F1

Yes/No

No

TCC Slip Speed

F0, F1

RPM

+/-50 RPM from Engine Speed

TFP Sw.

F0

Park/Neutral, Reverse, Drive4, Drive3, Drive2, Drive1 or Invalid

Park/Neutral

TFP Sw. A/B/C

F0

HI/LOW

HI/LOW/HI

TFT Sensor

F0, F1, F6

Volts

Varies

Torque Converter Efficiency

F0, F1, F2, F3, F4

Ratio

.00:1

Tow/Haul Mode

F0

Active/Inactive

Inactive

TP Angle

F0, F1, F2, F3, F4, F5, F6

Percent

0%

TP Sensor

F0, F1, F2, F3, F4, F5

Volts

0.3-0.9 V

TR Sw.

F0

Park/Neutral, Reverse, Drive4, Drive3, Drive2, Drive1 or Invalid

Park/Neutral

TR Sw. A/B/C/P

F0

HI/LOW

LOW/HI/HI/LOW

Traction Control

F0

Active/Inactive

Inactive

Trans. Fluid Temp.

F0, F1, F5, F6

°C (°F)

Varies

Transfer Case Ratio

F0, F2, F3, F4

Ratio

0.00:1

Transmission Hot Mode

F0, F1

On/Off

Off

Transmission OSS

F0, F1, F2, F3, F4, F5

RPM

0

Vehicle Speed

F0, F1, F2, F3, F4, F5

km/h (mph)

0

*Data List Legend

    • F0: Trans. Data
    • F1: TCC Data
    • F2: 1-2 Shift Data
    • F3: 2-3 Shift Data
    • F4: 3-4 Shift Data
    • F5: 3-2 Down Shift Data
    • F6: PC Solenoid Data
    • F7: 1-2 Adapt. Data
    • F8: 2-3 Adapt. Data