GM Service Manual Online
For 1990-2009 cars only

Use the scan tool data values under the following conditions:

    • The Diagnostic System Check - Vehicle 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

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

1-2 Shift Error

F2, F6/F0

Seconds

Varies

1-2 Shift Time

F0, F2, F6/F0

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 4-14

F6/F0

kPa (psi)

Varies

2-3 Shift Error

F3, F6/F1

Seconds

Varies

2-3 Shift Time

F0, F3, F6/F1

Seconds

Varies

2-3 Sol.

F0, F2, F3, F4

On/Off

Off

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 4-14

F6/F1

kPa (psi)

Varies

3-4 Shift Error

F4, F6/F2

Seconds

Varies

3-4 Shift Time

F0, F4, F6/F2

Seconds

Varies

3-4 TAP Cell 4-14

F6/F2

kPa (psi)

Varies

A/C Clutch

F0

On/Off

Off

Commanded Gear

F0, F1, F2, F3, F4, F5

1, 2, 3, 4

1

Cruise

F0

Disabled/Enabled

Disabled

Current TAP Cell

F6/F0, F6/F1, F6/F2

4-14

Varies

ECT

F0, F1

°C (°F)

85-105°C (185-220°F)

Engine Run Time

F0

hours:minutes:seconds

Varies

Engine Speed

F0, F1, F2, F3, F4, F5

RPM

Varies

Engine Torque

F0, F1

N·m (lb ft)

Varies

Gear Ratio

F0, F1, F2, F3, F4

Ratio

3.98:1

Ignition Voltage

F0

Volts

12.6-14.0

Last Shift Time

F0

Seconds

Varies

PC Sol. Actual Current

F0, F5

Amps

Varies

PC Sol. Duty Cycle

F0, F5

%

Varies

PC Sol. Ref. Current

F0, F5

Amps

Varies

Steady State TAP 1GR

F6/F3

kPa (psi)

Varies

Steady State TAP 2GR

F6/F3

kPa (psi)

Varies

Steady State TAP 2GR/TCC

F6/F3

kPa (psi)

Varies

Steady State TAP 3GR

F6/F3

kPa (psi)

Varies

Steady State TAP 3GR/TCC

F6/F3

kPa (psi)

Varies

Steady State TAP 4GR

F6/F3

kPa (psi)

Varies

Steady State TAP 4GR/TCC

F6/F3

kPa (psi)

Varies

Steady State TAP Reverse

F6/F3

kPa (psi)

Varies

TCC Brake Switch

F0, F1

Open/Closed

Closed

TCC Duty Cycle

F0, F1

%

0%

TCC Duty Cycle Open/Short to GND

F1

Yes/No

No

TCC Duty Cycle Short to Volts

F1

Yes/No

No

TCC Release Pressure

F0, F1

Yes/No

Yes

TCC Slip Speed

F0, F1

RPM

Varies

TFP Sw.

F0

Park/Neutral, Reverse, Drive, or invalid

Park/Neutral

TFP Sw. Sig. B/Sig. C

F0

HI/LOW

HI/HI

TFT Sensor

F0, F1, F5

Volts

Varies

TP Angle

F0, F1, F2, F3, F4, F5

%

0%

TP Sensor

F0, F1, F2, F3, F4

Volts

0.20-0.74 volts

TR Sw.

F0

Park/Neutral, Reverse, Drive 4, Drive 3, Drive 2, Drive 1 or invalid

Park/Neutral

TR Sw. A/B/C/P

F0

HI/LOW

LOW/HI/HI/LOW

Trans. Fluid Temp.

F0, F1, F5

°C (°F)

80-90°C (176-194°F)

Transmission Hot Mode

F0, F1

On/Off

Off

Transmission ISS

F0, F1, F2, F3, F4

RPM

Varies

Transmission OSS

F0, F1, F2, F3, F4

RPM

0

Vehicle Speed

F0, F1, F2, F3, F4

km/h (mph)

0

    • F0: Transmission Data
    • F1: TCC Data
    • F2: 1-2 Shift Data
    • F3: 2-3 Shift Data
    • F4: 3-4 Shift Data
    • F5: PC Solenoid Data
    • F6/F0: Transmission Adapts/1-2 Adapt. Data
    • F6/F1: Transmission Adapts/2-3 Adapt. Data
    • F6/F2: Transmission Adapts/3-4 Adapt. Data
    • F6/F3: Transmission Adapts/Steady State Data