Scan Tool Data Definitions Gas

1-2 Shift Error: Displays a range of -6.38 to +6.38 seconds. This parameter is the difference between the desired 1-2 shift time and the actual 1-2 shift time. A positive number indicates the actual shift time was longer than the desired shift time.

1-2 Shift Time: Displays 0.00-6.38 seconds. This parameter is the actual time of the last 1-2 shift. The shift time is based on the gear ratio change after the commanded 1-2 shift. This value is only accurate if the adaptable shift parameter indicates Yes.

1-2 Solenoid: Displays ON or OFF. These parameters are the commanded status of the 1-2 shift solenoid valve. ON represents a commanded energized state, current is flowing through the solenoid. OFF represents a non-commanded state, current is not flowing through the solenoid.

1-2 Solenoid Open/Short to Ground: Displays Yes or No. This parameter indicates if an open or a short to ground exists in the feedback signal from the 1-2 shift solenoid valve to the PCM.

1-2 Solenoid Short to Volts: Displays Yes or No. This parameter indicates if a short to B+ exists in the feedback signal from the 1-2 shift solenoid valve to the PCM.

1-2 TAP Cell (4-16): Scan tool displays kPa or psi. This parameter displays the amount of pressure varied from a calibrated base line pressure for shifts. Each TAP cell is based on a calibrated shift torque value. Each TAP cell value is calculated from the last shift time. This cell pressure is used in addition to the calibrated base line pressure to adjust the apply of a clutch or band during the next shift.

2-3 Shift Error: Displays a range of -6.38 to +6.38 seconds. This parameter is the difference between the desired 2-3 shift time and the actual 2-3 shift time. A positive number indicates the actual shift time was longer than the desired shift time.

2-3 Shift Time: Displays 0.00-6.38 seconds. This parameter is the actual time of the last 2-3 shift. The shift time is based on the gear ratio change after the commanded 2-3 shift. This value is only accurate if the adaptable shift parameter indicates Yes.

2-3 Solenoid: Displays ON or OFF. These parameters are the commanded status of the 2-3 shift solenoid valve. ON represents a commanded energized state, current is flowing through the solenoid. OFF represents a non-commanded state, current is not flowing through the solenoid.

2-3 Solenoid Open/Short to Ground: Displays Yes or No. This parameter indicates if an open or a short to ground exists in the feedback signal from the 2-3 shift solenoid valve to the PCM.

2-3 Solenoid Short to Volts: Displays Yes or No. This parameter indicates if a short to B+ exists in the feedback signal from the 2-3 shift solenoid valve to the PCM.

2-3 TAP Cell (4-16): Scan tool displays kPa or psi. This parameter displays the amount of pressure varied from a calibrated base line pressure for shifts. Each TAP cell is based on a calibrated shift torque value. Each TAP cell value is calculated from the last shift time. This cell pressure is used in addition to the calibrated base line pressure to adjust the apply of a clutch or band during the next shift.

3-4 Shift Error: Displays a range of -6.38 to +6.38 seconds. This parameter is the difference between the desired 3-4 shift time and the actual 3-4 shift time. A positive number indicates the actual shift time was longer than the desired shift time.

3-4 Shift Time: Displays 0.00-6.38 seconds. This parameter is the actual time of the last 3-4 shift. The shift time is based on the gear ratio change after the commanded 3-4 shift.

3-4 TAP Cell (4-16): Scan tool displays kPa or psi. This parameter displays the amount of pressure varied from a calibrated base line pressure for shifts. Each TAP cell is based on a calibrated shift torque value. Each TAP cell value is calculated from the last shift time. This cell pressure is used in addition to the calibrated base line pressure to adjust the apply of a clutch or band during the next shift.

4WD: Displays Enabled or Disabled. This parameter indicates whether the vehicle is currently in a four-wheel drive mode.

4WD Low: Displays Enabled or Disabled. This parameter is the signal state of the four-wheel drive low circuit. Enabled indicates a 0 voltage signal requesting 4WD low. Disabled indicates a B+ voltage signal which does not request 4WD low.

A/C Clutch: Displays ON or OFF. This represents the commanded state of the A/C clutch control relay. The clutch should be engaged whenever ON is displayed. The PCM compensates for the additional engine load that is accompanied with the A/C clutch engaged.

Commanded Gear: Displays 1, 2, 3, or 4. This parameter indicates the current commanded state of the shift solenoids.

Cruise: Displays ENABLED or DISABLED. This parameter indicates whether the PCM is allowing cruise operation. The PCM has the ability to disable cruise control under certain conditions.

Current TAP (Transmission Adaptive Pressure) Cell: The scan tool displays cells 4-16. This parameter indicates the current TAP cell in use for transmission line pressure adaptation. The cells are based on engine torque. The higher the engine torque, the higher the current TAP cell. The last cell used will remain displayed until the next adaptable upshift occurs.

ECT (Engine Coolant Temperature): Displays -40 to +151°C (-40 to +304°F). This parameter is the input signal of the engine coolant temperature sensor. Engine coolant temperature is high when the signal voltage is low, 0 volts, and engine coolant temperature is low when the signal voltage is high, 5 volts.

Engine Run Time: Displays a range of 0:00:00-18:12:15 Hr/Min/Sec. This parameter measures how long the engine has been operating. When you turn the ignition switch OFF, the value resets to zero.

Engine Speed: Displays 0-8192 RPM. This parameter indicates the rotational speed of the engine expressed as revolutions per minute.

Engine Torque: Displays 0-9999 ft/lb. This parameter is a calculated value based on engine load, throttle position, mass air flow, and other engine inputs. This parameter is accurate to within 15 ft/lb of actual measured engine torque.

Gear Ratio: Displays a range of 0.00 to 8.00:1. This parameter is the actual gear ratio of the current commanded gear. In the current gear of R, D3, D2, and D1, it is calculated by dividing the input speed by the output speed. In the current gear of D4 with TCC lock up, the gear ratio is calculated by dividing the turbine speed by the output speed.

Ignition Voltage: Displays 0.0-25.5 volts. This parameter represents the system voltage measured by the PCM at the ignition feed.

Last Shift Time: Displays 0.00-6.38 seconds. This parameter is the actual shift time of the last upshift.

P1870 Slip Counter: This parameter displays 0 or 1. When all the Conditions for Setting DTC P1870 are met, the counter increments from 0 to 1. On the second consecutive failure, DTC P1870 will illuminate the MIL and the counter will reset to 0.

PC (Pressure Control) Solenoid Act. (Actual) Current: Displays 0.00-1.1 amps. This parameter is the actual current of the pressure control solenoid circuit at the control module. Zero amp, no current flow, indicates an actual higher line pressure. A reading of 1.1 amp, high current flow, indicates an actual lower line pressure.

PC (Pressure Control) Solenoid Duty Cycle: Displays 0-100 percent. This parameter is the commanded state of the pressure control solenoid expressed as a percentage of energized ON time. A reading of 0 percent indicates zero ON time, non energized, or no current flow. Approximately 60 percent at idle indicates maximum ON time, energized, or high current flow.

PC (Pressure Control) Solenoid Ref. (Reference) Current: Displays 0.00-1.1 amps. This parameter is the commanded current of the pressure control solenoid circuit at the control module. Zero amp, no current flow, indicates a commanded higher line pressure. A reading of 1.1 amp, high current flow, indicates a commanded lower line pressure.

Power Take-Off: Displays Yes or No. This parameter indicates when the Power Take Off (PTO) is engaged. PTO mode disables all transmission diagnostics.

Speed Ratio: The scan tool displays a range of 0.00:1-8.00:1. This parameter indicates engine speed divided by transmission output speed.

TCC Brake Switch: Displays Open or Closed. This parameter indicates the state of the TCC brake switch circuit input. Open indicates a zero voltage input, the brake switch is open and the brake pedal is applied. Closed indicates a B+ voltage input, the brake switch is closed and the brake pedal is not applied.

TCC Duty Cycle: Displays 0-100 percent. This parameter is the commanded percentage of ON time of the TCC PWM solenoid. 90 percent represents an ON, energized, commanded state. 0 percent represents an OFF, non-energized, commanded state.

TCC Duty Cycle Open/Short to Ground: Displays Yes or No. This parameter indicates if an open or a short to ground exists in the feedback signal from the TCC PWM solenoid valve to the PCM.

TCC Duty Short to Voltage: Displays Yes or No. This parameter indicates if a short to B+ exists in the feedback signal from the TCC PWM solenoid valve to the PCM.

TCC (Torque Converter Clutch) Slip Speed: Displays -4080 to +4079 RPM. This parameter is the difference between transmission input speed and engine speed. A negative value indicates that the engine speed is less than the input speed, deceleration. A positive value indicates that the engine speed is greater than the input speed, acceleration. A value of zero indicates that the engine speed is equal to the input speed, TCC is applied.

TFP Switch A/B/C: Displays HI/LOW, HI/LOW, HI/LOW. These parameters are the three inputs from the automatic transmission fluid pressure manual valve position switch Assembly. HI represents a 0 voltage signal. LOW represents a B+ voltage signal.

TFT (Transmission Fluid Temperature) Sensor: Displays 0.00-5.00 volts. When the transmission fluid is cold, the sensor resistance is high and the PCM senses a high signal voltage. As the transmission fluid temperature warms to normal operating temperature, the sensor resistance becomes less and the voltage decreases to about 1.5-2.0 volts.

Tow/Haul Mode: Displays Yes or No. This parameter indicates when the transmission is operating in a Tow/Haul mode. In Tow/Haul mode, the PCM commands a different shift pattern that increases performance when towing and hauling. Shift quality and TCC scheduling are also affected during Tow/Haul mode operation.

Transfer Case Ratio: The scan tool displays a range of 0.00-3.88:1. This parameter indicates the ratio of the transfer case calculated by input speed divided by transmission output speed based on transmission commanded gear.

Trans. Fluid Temp. (TFT): Displays -40 to +151°C (-40 to +304°F). This parameter is the input signal of the transmission fluid temperature sensor. Transmission fluid temperature is high when the signal voltage is low, 0 volts, and transmission fluid temperature is low when the signal voltage is high, 5 volts.

Transmission Hot Mode: Displays ON or OFF. This parameter monitors the transmission fluid temperature. YES indicates that the transmission fluid temperature has exceeded 135°C (275°F).

Transmission ISS (Input Shaft Speed): Displays 0-8192 RPM. This parameter measures the rotational speed of the input shaft expressed as revolutions per minute.

Transmission OSS (Output Shaft Speed): Displays 0-8192 RPM. This parameter indicates the rotational speed of the transmission output shaft expressed as revolutions per minute. On four-wheel drive applications, the transfer case output shaft speed is measured.

TR Sw. A/B/C/P: Displays HI/LOW, HI/LOW, HI/LOW, HI/LOW. This parameter indicates the status of the four inputs from the transmission range switch to the PCM. HI indicates an ignition voltage input to the PCM. LOW indicates a zero voltage input to the PCM.

TR Sw.: Displays Park/Neutral, Reverse, Drive4, Drive3, Drive2, Drive1, or invalid. This parameter is the decoded status of the four A/B/C/P inputs from the transmission range switch. Invalid is displayed when the PCM does not recognize a valid combination of inputs.

Turbine Speed: Displays 0-8192 RPM. This parameter indicates the rotational speed of the torque converter turbine shaft expressed as revolutions per minute. In commanded gears 1, 2, and 3, the turbine speed equals the input speed. In commanded gear 4, the turbine speed equals 3/4 of the input speed.

Vehicle Speed: Displays 0-255 km/h (0-158 mph). This parameter is the input signal from the OSS sensor.

Scan Tool Data Definitions Diesel

1-2 Shift Error: Displays a range of -6.38 to +6.38 seconds. This parameter is the difference between the desired 1-2 shift time and the actual 1-2 shift time. A positive number indicates the actual shift time was longer than the desired shift time. This value is only accurate if the Adaptable Shift parameter indicates Yes.

1-2 Shift Time: Displays 0.00-6.38 seconds. This parameter is the actual time of the last 1-2 shift. The shift time is based on the gear ratio change after the commanded 1-2 shift. This value is only accurate if the adaptable shift parameter indicates Yes.

1-2 Solenoid: Displays ON or OFF. These parameters are the commanded status of the 1-2 shift solenoid valves. ON represents a commanded energized state, current is flowing through the solenoid. OFF represents a non-commanded state, current is not flowing through the solenoid.

1-2 Solenoid Open/Short to Ground: Displays Yes or No. This parameter indicates if an open or a short to ground exists in the feedback signal from the 1-2 shift solenoid valve to the controller.

1-2 Solenoid Short to Voltage: Displays Yes or No. This parameter indicates if a short to B+ exists in the feedback signal from the 1-2 shift solenoid valve to the controller.

1-2 TAP Cell (4-16): Scan tool displays kPa or psi. This parameter displays the amount of pressure varied from a calibrated base line pressure for shifts. Each TAP cell is based on a calibrated shift torque value. Each TAP cell value is calculated from the last shift time. This cell pressure is used in addition to the calibrated base line pressure to adjust the apply of a clutch or band during the next shift.

2-3 Shift Error: Displays a range of -6.38 to +6.38 seconds. This parameter is the difference between the desired 2-3 shift time and the actual 2-3 shift time. A positive number indicates the actual shift time was longer than the desired shift time. This value is only accurate if the Adaptable Shift parameter indicates Yes.

2-3 Shift Time: Displays 0.00-6.38 seconds. This parameter is the actual time of the last 2-3 shift. The shift time is based on the gear ratio change after the commanded 2-3 shift. This value is only accurate if the adaptable shift parameter indicates Yes.

2-3 Solenoid: Displays ON or OFF. These parameters are the commanded status of the 2-3 shift solenoid valves. ON represents a commanded energized state, current is flowing through the solenoid. OFF represents a non-commanded state, current is not flowing through the solenoid.

2-3 Solenoid Open/Short to Ground: Displays Yes or No. This parameter indicates if an open or a short to ground exists in the feedback signal from the 2-3 shift solenoid valve to the controller.

2-3 Solenoid Short to Voltage: Displays Yes or No. This parameter indicates if a short to B+ exists in the feedback signal from the 2-3 shift solenoid valve to the controller.

2-3 TAP Cell (4-16): Scan tool displays kPa or psi. This parameter displays the amount of pressure varied from a calibrated base line pressure for shifts. Each TAP cell is based on a calibrated shift torque value. Each TAP cell value is calculated from the last shift time. This cell pressure is used in addition to the calibrated base line pressure to adjust the apply of a clutch or band during the next shift.

3-4 Shift Error: Displays a range of -6.38 to +6.38 seconds. This parameter is the difference between the desired 3-4 shift time and the actual 3-4 shift time. A positive number indicates the actual shift time was longer than the desired shift time. This value is only accurate if the Adaptable Shift parameter indicates Yes.

3-4 Shift Time: Displays 0.00-6.38 seconds. This parameter is the actual time of the last 3-4 shift. The shift time is based on the gear ratio change after the commanded 3-4 shift. This value is only accurate if the adaptable shift parameter indicates Yes.

3-4 TAP Cell (4-16): Scan tool displays kPa or psi. This parameter displays the amount of pressure varied from a calibrated base line pressure for shifts. Each TAP cell is based on a calibrated shift torque value. Each TAP cell value is calculated from the last shift time. This cell pressure is used in addition to the calibrated base line pressure to adjust the apply of a clutch or band during the next shift.

4WD: Displays Enabled or Disabled. This parameter indicates whether the vehicle is currently in a four-wheel drive mode.

4WD Low: Displays Enabled or Disabled. This parameter is the signal state of the four-wheel drive low circuit. Enabled indicates a 0 voltage signal requesting 4WD low. Disabled indicates a B+ voltage signal which does not request 4WD low.

A/C Clutch: Displays ON or OFF. This represents the commanded state of the A/C clutch control relay. The clutch should be engaged whenever ON is displayed. The controller compensates for the additional engine load that is accompanied with the A/C clutch engaged.

Commanded Gear: Displays 1, 2, 3, or 4. This parameter indicates the current commanded state of the shift solenoids.

Cruise: Displays ENABLED or DISABLED. This parameter indicates whether the controller is allowing cruise operation. The controller has the ability to disable cruise control under certain conditions.

Current TAP (Transmission Adaptive Pressure) Cell: The scan tool displays cells 4-16. This parameter indicates the current TAP cell in use for transmission line pressure adaptation. The cells are based on engine torque. The higher the engine torque, the higher the current TAP cell. The last cell used will remain displayed until the next adaptable upshift occurs.

ECT (Engine Coolant Temperature): Displays -40 to +151°C (-40 to +304°F). This parameter is the input signal of the engine coolant temperature sensor. Engine coolant temperature is high when the signal voltage is low, 0 volts, and engine coolant temperature is low when the signal voltage is high, 5 volts.

Engine Run Time: Displays a range of 0:00:00-18:12:15 Hr/Min/Sec. This parameter measures how long the engine has been operating. When you turn the ignition switch OFF, the value resets to zero.

Engine Speed: Displays 0-8192 RPM. This parameter indicates the rotational speed of the engine expressed as revolutions per minute.

Engine Torque: Displays 0-9999 ft/lb. This parameter is a calculated value based on engine load, throttle position, mass air flow, and other engine inputs. This parameter is accurate to within 15 ft/lb of actual measured engine torque.

Gear Ratio: Displays a range of 0.00 to 8.00:1. This parameter is the actual gear ratio of the current commanded gear. In the current gear of R, D3, D2, and D1, it is calculated by dividing the input speed by the output speed. In the current gear of D4 with TCC lock up, the gear ratio is calculated by dividing the turbine speed by the output speed.

Ignition Voltage: Displays 0.0-25.5 volts. This parameter represents the system voltage measured by the controller at its ignition feed.

Latest Shift: Displays 0.00-6.38 seconds. This parameter is the actual shift time of the last upshift. This value is only accurate if the adaptable shift parameter indicates YES.

Maximum Tap (Transmission Adaptive Pressure): Displays Yes or No. This parameter indicates when line pressure modification, adaptation, has reached its limit. Yes indicates the limit has been reached. No indicates the limit has not been reached.

PC (Pressure Control) Solenoid Act. (Actual) Current: Displays 0.00-1.1 amps. This parameter is the actual current of the pressure control solenoid circuit at the control module. Zero amp, no current flow, indicates an actual higher line pressure. A reading of 1.1 amp, high current flow, indicates an actual lower line pressure.

PC (Pressure Control) Solenoid Duty Cycle: Displays 0-100%. This parameter is the commanded state of the pressure control solenoid expressed as a percentage of energized ON time. A reading of 0% indicates zero ON time, non energized, or no current flow. Approximately 60% at idle indicates maximum ON time, energized, or high current flow.

PC (Pressure Control) Solenoid Ref. (Reference) Current: Displays 0.00-1.1 amps. This parameter is the commanded current of the pressure control solenoid circuit at the control module. Zero amp, no current flow, indicates a commanded higher line pressure. A reading of 1.1 amp, high current flow, indicates a commanded lower line pressure.

Speed Ratio: The scan tool displays a range of 0.00:1-8.00:1. This parameter indicates engine speed divided by transmission output speed.

TAP Gear 1: Range: 0-876 kPa (0-127 psi). This display indicates a pressure modification which is added to the line pressure in 1st gear when the PCM detects a worn or slipping component.

TAP Gear 2: Range: 0-876 kPa (0-127 psi). This display indicates a pressure modification which is added to the line pressure in 2nd gear when the PCM detects a worn or slipping component.

TAP Gear 2 TCC: Range: 0-876 kPa (0-127 psi). This display indicates a pressure modification which is added to the line pressure in 2nd gear with TCC applied when the PCM detects a worn or slipping component.

TAP Gear 3: Range: 0-876 kPa (0-127 psi). This display indicates a pressure modification which is added to the line pressure in 3rd gear when the PCM detects a worn or slipping component.

TAP Gear 3 TCC: Range: 0-876 kPa (0-127 psi). This display indicates a pressure modification which is added to the line pressure in 3rd gear with TCC applied when the PCM detects a worn or slipping component.

TAP Gear 4: Range: 0-876 kPa (0-127 psi). This display indicates a pressure modification which is added to the line pressure in 4th gear when the controller detects a worn or slipping component.

TAP Gear 4 TCC: Range: 0-876 kPa (0-127 psi). This display indicates a pressure modification which is added to the line pressure in 4th gear with TCC applied when the controller detects a worn or slipping component.

TAP Reverse: Range: 0-876 kPa (0-127 psi). This display indicates a pressure modification which is added to the line pressure in Reverse gear when the PCM detects a worn or slipping component.

TCC Brake Switch (L57/L65 EFI Application): Displays Open or Closed. This parameter indicates the state of the TCC brake switch circuit input. Open indicates a zero voltage input, the brake switch is open and the brake pedal is not applied. Closed indicates a B+ voltage input, the brake switch is closed when the brake pedal is applied.

TCC Duty Cycle: Displays 0-100%. This parameter is the commanded percentage of ON time of the TCC PWM solenoid. 90% represents an ON, energized, commanded state. 0% represents an OFF, non-energized, commanded state.

TCC Duty Cycle Open/Short to Ground: Displays Yes or No. This parameter indicates if an open or a short to ground exists in the feedback signal from the TCC PWM solenoid valve to the controller.

TCC Duty Short to Voltage: Displays Yes or No. This parameter indicates if a short to B+ exists in the feedback signal from the TCC PWM solenoid valve to the controller.

TCC (Torque Converter Clutch) Slip Speed: Displays -4080 to +4079 RPM. This parameter is the difference between transmission input speed and engine speed. A negative value indicates that the engine speed is less than the input speed, deceleration. A positive value indicates that the engine speed is greater than the input speed, acceleration. A value of zero indicates that the engine speed is equal to the input speed, TCC is applied.

TFP Switch A/B/C: Displays LOW/HI, LOW/HI, LOW/HI. These parameters are the three inputs from the automatic transmission fluid pressure manual valve position switch Assembly. LOW represents a 0 voltage signal. HI represents a B+ voltage signal.

TFT (Transmission Fluid Temperature) Sensor: Displays 0.00-5.00 volts. When the transmission fluid is cold, the sensor resistance is high and the controller senses a high signal voltage. As the transmission fluid temperature warms to normal operating temperature, the sensor resistance becomes less and the voltage decreases to about 1.5-2.0 volts.

Trans. Fluid Temp. (TFT): Displays -40 to +151°C (-40 to +304°F). This parameter is the input signal of the transmission fluid temperature sensor. Transmission fluid temperature is high when the signal voltage is low, 0 volts, and transmission fluid temperature is low when the signal voltage is high, 5 volts.

Transmission Hot Mode: Displays ON or OFF. This parameter monitors the transmission fluid temperature. YES indicates that the transmission fluid temperature has exceeded 135°C (275°F).

Transmission ISS (Input Shaft Speed): Displays 0-8192 RPM. This parameter measures the rotational speed of the input shaft expressed as revolutions per minute.

Transmission OSS (Output Shaft Speed): Displays 0-8192 RPM. This parameter indicates the rotational speed of the transmission output shaft expressed as revolutions per minute. On four-wheel drive applications, the transfer case output shaft speed is measured.

Turbine Speed: Displays 0-8192 RPM. This parameter indicates the rotational speed of the torque converter turbine shaft expressed as revolutions per minute. In commanded gears 1, 2, and 3, the turbine speed equals the input speed. In commanded gear 4, the turbine speed equals 3/4 of the input speed.

Vehicle Speed: Displays 0-255 km/h (0-158 mph). This parameter is the input signal from the OSS sensor.