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Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC P42 Commercial Chassis 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 4L80-E 🢒 Transmission Scan Tool Data Values

Transmission Scan Tool Data Values Gas

Use the scan tool data values 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

At-1 Data List

Scan Tool Parameter

Data List*

Units

Typical Data Values

1-2 Shift Error

F2,F6

Seconds

Varies

1-2 Shift Time

F0,F2

Seconds

Varies

1-2 Sol.

F0,F2,F3,F4

On/Off

On

1-2 Sol. Open/Short to GRD

F0,F2

Yes/No

No

1-2 Sol. Short to Volts

F0,F2

Yes/No

No

1-2 TAP Cell (4-16)

F6

kPa/Psi

Varies

2-3 Shift Error

F3,F7

Seconds

Varies

2-3 Shift Time

F0,F3

Seconds

Varies

2-3 Sol.

F0,F2,F3,F4

On/Off

Off

2-3 Sol. Open/Short to GRD

F0,F3

Yes/No

No

2-3 Sol. Shorted to Volts

F0,F3

Yes/No

No

2-3 TAP Cell (4-16)

F7

kPa/Psi

Varies

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

Adaptable Shift

F0,F6,F7

Yes/No

No

Cruise

F0

Enabled/Disabled

Disabled

Current Gear

F0,F1,F2,F3,F4,F5

1,2,3,4

1

Current TAP Cell

F6,F7

0-16

Varies

ECT

F0,F1

°C (°F)

Varies

Engine Run Time

F0

Hr:Min:Sec

Varies

Engine Speed

F0,F1,F2,F3,F4,F5

RPM

600-800

Engine Torque

F0,F1

N·m (lb ft)

0

Gear Ratio

F0,F2,F3,F4

Ratio

8:00

IAT

F0

°C (°F)

Varies

Ignition Voltage

F0

Volts

13.5-14.5

Last TAP

F6,F7

kPa/Psi

Varies

Maximum TAP

F6,F7

Yes/No

No

PC Sol. Actual Current

F0,F5

Amps

0.92 amps

PC Sol. Duty Cycle

F0,F5

Percent On Time

51%/Varies

PC Sol. Ref. Current

F0,F5

Amps

0.92 amps

Power Take-Off

F0

Yes/No

No

Speed Ratio

F0,F1,F2,F3,F4

Ratio

8.00:1

TCC Brake Switch

F0,F1

Open/Closed

Closed

TCC Duty Cycle

F0,F1

%

0%

TCC Duty Cycle Open Short to GRD

F0,F1

Yes/No

No

TCC Duty Cycle Short to Volts

F0,F1

Yes/No

No

TCC Mode

F0,F1

0-5

0

TCC Slip Speed

F0,F1

RPM

+/- 150

TFP Sw. A/B/C

F0

On/Off

Off/On/Off

TFT Sensor

F0

Volts

Varies

TP Angle

F0,F1,F2,F3,F4,F5,F6,F7

Percent

0%

TP Sensor

F0,F1,F2,F3,F4

Volts

0.5-0.7 V

Trans. Fluid Temp.

F0,F1,F5

°C (°F)

Varies

Transmission Hot Mode

F0,F1

On/Off

Off

Transmission ISS

F0,F1,F2,F3,F4

RPM

600-800

Transmission OSS

F0,F1,F2,F3,F4

RPM

0

Turbine Speed

F0,F1,F2,F3,F4

RPM

600-800

Vehicle Speed

F0,F1,F2,F3,F4

km/h (mph)

0

*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: 1-2 Adapt Data
    • F7: 2-3 Adapt Data

Transmission Scan Tool Data Values Diesel

Use the scan tool data values 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 Values (Diesel PCM)

Scan Tool Parameter

Data List*

Units

Typical Data Values

1-2 Shift Time

F0,F2

Seconds

Varies

1-2 Shift Time Error

F2, F6

Seconds

Varies

1-2 Sol.

F0,F2,F3,F4

On/Off

On

1-2 Sol. Open/Short to GND

F0,F2

Yes/No

No

1-2 Sol. Short to Volts

F0,F2

Yes/No

No

1-2 TAP Cell (4-16)

F6

kPa/Psi

Varies

2-3 Shift Time

F0,F3

Seconds

Varies

2-3 Shift Time Error

F3,F7

Seconds

Varies

2-3 Sol.

F0,F2,F3,F4

On/Off

Off

2-3 Sol. Open/Short to GND

F0,F3

Yes/No

No

2-3 Sol. Shorted to Volts

F0,F3

Yes/No

No

2-3 TAP Cell (4-16)

F7

kPa/Psi

Varies

3-4 Shift Time

F0, F4

Seconds

Varies

3-4 Shift Time Error

F4

Seconds

Varies

4WD

F0

Enabled/Disabled

Disabled

4WD Low

F0

Enabled/Disabled

Disabled

A/C Clutch

F0

On/Off

Off

Adaptable Shift

F0,F6,F7

Yes/No

No

APP Angle

F0,F1,F2,F3,F4,F5

%

0%

Cruise

F0

Enabled/Disabled

Disabled

Current Gear

F0,F2,F3,F4,F5

1,2,3,4

1

Current TAP Cell

F6,F7

0-16

Varies

Current TAP Memory

F6,F7

0-16

Varies

ECT

F0,F1

°C (°F)

Varies

Engine Run Time

F0

Hr:Min:Sec

Varies

Engine Speed

F0,F1,F2,F3,F4,F5

RPM

600-800

Engine Torque

F0

N·m (lb ft)

0

Gear Ratio

F0,F2,F3,F4

Ratio

3:98:1

Hot Mode

F0,F1

On/Off

Off

IAT

F0

°C (°F)

Varies

Ignition Voltage

F0

Volts

13.5-14.5

Last TAP

F0

kPa/Psi

Varies

Latest Shift

F0

Sec.

Varies

Maximum TAP

F6,F7

Yes/No

No

PC Sol. Actual Current

F0,F5

Amps

0.92 amps

PC Sol. Duty Cycle

F0,F5

Percent On Time

51%/Varies

PC Sol. Ref. Current

F0,F5

Amps

0.92 amps

Speed Ratio

F0,F2,F3,F4

Ratio

3.98

TAP Gear 1

F8

kPa/Psi

0

TAP Gear 2

F8

kPa/Psi

0

TAP Gear 2 TCC

F8

kPa/Psi

0

TAP Gear 3

F8

kPa/Psi

0

TAP Gear 3 TCC

F8

kPa/Psi

0

TAP Gear 4

F8

kPa/Psi

0

TAP Gear 4 TCC

F8

kPa/Psi

0

TAP Gear Reverse

F8

kPa/Psi

0

TCC Brake Switch

F0,F1

Open/Closed

Open

TCC Duty Cycle

F0,F1

%

0%

TCC Duty Cycle Open Short to GND

F0,F1

Yes/No

No

TCC Duty Cycle Short to Volts

F0,F1

Yes/No

No

TCC Slip Speed

F0,F1

RPM

+/- 150

TFP Sw. A/B/C

F0

On/Off

Off/On/Off

TFT Sensor

F0,F1

Volts

Varies

Trans. Fluid Temp.

F0,F1,F5

°C (°F)

Varies

Transmission ISS

F0,F1,F2,F3,F4

RPM

600-800

Transmission OSS

F0,F1,F2,F3,F4

RPM

0

Turbine Speed

F0,F1,F2,F3,F4

RPM

600-800

Vehicle Speed

F0,F1,F2,F3,F4

km/h (mph)

0

*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: 1-2 Adapt Data
    • F7: 2-3 Adapt Data
    • F8: Steady State Data

Transmission Scan Tool Data Values L57 MFI

Use the scan tool data values 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

At-1 Data List

SCAN Position

Units Displayed

Typical Scan Values

Engine Speed

RPM

600-900

Turbine Speed

RPM

600-900

TCC Slip Speed

RPM

-80 Varies

TCC Duty Cycle

%

0

Transmission ISS

RPM

600-900

Transmission OSS

RPM

0

TFP Sw. A/B/C

On/Off

Off/On/Off

Transmission Range

P/N

Park/Neutral

Current Gear

1, 2, 3, 4

1

Gear Ratio

4:1

4:00:1

PC Sol. Duty Cycle

%

Varies

PC Sol. Ref. Current

Amps

Varies

PC Sol. Actual Current

Amps

Varies

TCC Brake Switch

Open/Closed

Closed

Ignition Voltage

Volts

13-15.5

Trans. Fluid Temp.

°C/°F

80°C (175°F)

TP Angle

%

0

TP Sensor

Volts

0.5 Varies

1-2 Shift Time

Seconds

Varies

2-3 Shift Time

Seconds

Varies

Prom ID:

Numeric Value

Varies