GM Service Manual Online
For 1990-2009 cars only

Use the scan tool data list under the following conditions:

    • The Diagnostic 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

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 (4-16)

F6/F0

kPa/psi

each cell 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

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)

F6/F1

kPa/psi

each cell varies

3-4 Shift Error

F4, F6/F2

Seconds

varies

3-4 Shift Time

F0, F4, F6/F2

Seconds

varies

3-4 TAP Cell (4-16)

F6/F2

kPa/psi

each cell varies

ABS System Disable

F7

Yes/No

No

A/C Clutch

F0

On/Off

Off

AWD Circuit Status

F7

OK/Short/Open

OK

AWD Clutch Temp. Disable

F7

Yes/No

No

AWD Disabled

F7

Yes/No

No

AWD Duty Cycle

F7

Percent

varies

AWD Fluid Temp. Disable

F7

Yes/No

No

AWD Minispare Disable

F7

Yes/No

No

AWD Overtemp. Delay

F7

Yes/No

No

AWD Torque Management

F7

Active/Inactive

Inactive

AWD Voltage Disable

F7

Yes/No

No

AWD Wheel Speed Disable

F7

Yes/No

No

Commanded Gear

F0, F1, F2, F3, F4, F5, F7

1,2,3,4

1

Cruise

F0

Enabled/Disabled

Disabled

Current TAP Cell

F6/F0, F6/F1, F6/F2

4-16

varies

ECT

F0, F1, F7

°C (°F)

varies

Engine Run Time

F0

hours/minutes/seconds

varies

Engine Speed

F0, F1, F2, F3, F4, F5, F7

RPM

750-850 RPM

Engine Torque

F0, F1, F7

N·m (lb ft)

varies

Gear Ratio

F0, F1, F2, F3, F4, F7

ratio

3.98

Ignition Voltage

F0, F7

Volts

12.5-13.5 Volts

IMS

F0, F7

Park, Park/Reverse, Reverse, Reverse/Neutral, Neutral, Neutral/Drive 4, Drive 4, Drive 4/Drive 3, Drive 3, Drive 3/Drive 2, Drive 2, Drive 2/Drive 1, Drive 1, Invalid, Open

Park

IMS A/B/C/P

F0, F7

HI/LOW

LOW/HI/HI/LOW

Last Disable Odometer

F7

km (miles)

varies

Last Disable Reason

F7

Fluid Temp, Clutch Temp, Wheel Speed, Voltage, MiniSpare, ABS System

varies

Last Shift Time

F0

Seconds

varies

PC Sol. Actual Current

F0, F5

Amps

varies

PC Solenoid Duty Cycle

F0, F5

Percent

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

Percent

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

TFT Sensor

F0, F1, F5

Volts

varies

TP Angle

F0, F1, F2, F3, F4, F5, F7

Percent

0%

TP Sensor

F0, F1, F2, F3, F4

Volts

0.40-0.80 Volts

Traction Control

F0

Active/Inactive

Inactive

Trans. Fluid Temp.

F0, F1, F5, F7

°C (°F)

varies

Transmission Hot Mode

F0, F1

On/Off

Off

Transmission ISS

F0, F1, F2, F3, F4, F7

RPM

700-800 RPM

Transmission OSS

F0, F1, F2, F3, F4, F7

RPM

0 RPM

Vehicle Speed

F0, F1, F2, F3, F4, F7

km/h (mph)

0 km/h

*Data List Legend

    • 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: Transmission Adapts
    • F7: All Wheel Drive Data
    • F6/F0: 1-2 Adapt. Data
    • F6/F1: 2-3 Adapt. Data
    • F6/F2: 3-4 Adapt. Data
    • F6/F3: Steady State Data