Scan Tool Data Definitions

Scan Tool Data Definitions

1-2 Shift Time
This parameter displays the actual time of the last adaptable 1-2 shift. The shift time is based on the gear ratio change after the commanded 1-2 shift.

2-3 Shift Time
This parameter displays the actual time of the last adaptable 2-3 shift. The shift time is based on the gear ratio change after the commanded 2-3 shift.

3-4 Shift Time
This parameter displays the actual time of the last adaptable 3-4 shift. The shift time is based on the gear ratio change after the commanded 3-4 shift.

4-5 Shift Time
This parameter displays the actual time of the last adaptable 4-5 shift. The actual shift time is obtained by measuring the time required for the input shaft to decelerate from the previous ratio to the current ratio.

5-6 Shift Time
This parameter displays the actual time of the last 5-6 shift. The shift time is base on the gear ratio change after the commanded 5-6 shift.

Calc. Throttle Position
This parameter displays a calculated value, which is determined by the accelerator pedal position and the actual throttle position, used to optimize transmission controls. It represents the driver's intended request for torque or acceleration. The range is 0-100%, where 0% represents an idle or coast request and 100% represents a request for wide open throttle (WOT).

Commanded Gear
This parameter displays the current commanded state of the shift solenoid valves. The scan tool displays 1, 2, 3, 4 or 5.

Distance Since First Failure
This parameter displays distance in km (mi).

Driver Shift Control
This parameter displays Active or Inactive. The scan tool displays Active when the gear selector is in the manual (M) position, which enables TAP Shift. The scan tool displays Inactive when the gear selector is not in the M position, TAP Shift disabled.

Driver Shift Request
This parameter displays the current request from the TAP Shift System. This parameter will display upshift, downshift or invalid, depending on the amount of voltage measured at the remote shift selector input, and will also display none when there is no request.

ECT Sensor
This parameter displays the input signal from the engine coolant temperature (ECT) sensor. ECT is high at 151°C (304°F) when the signal voltage is low, 0 volt. ECT is low at -40°C (-40°F) when the signal voltage is high, 5 volt.

Engine Run Time
This parameter displays a measure in Hr:Min:Sec of the length of time the engine has been operating. When the ignition is cycled to OFF, the value is reset to zero.

Engine Speed
This parameter displays the rotational speed of the engine expressed as revolutions per minute.

Engine Torque
This parameter displays a calculated value based on engine load, throttle position, mass air flow, and other engine inputs. This parameter is accurate to within 20 Nm (15 ft. lbs.) of actual measured engine torque.

Fail Counter
This parameter counts.

Gear Ratio
This parameter displays the actual transmission gear ratio. The scan tool displays the gear ratio calculated from the automatic transmission input shaft speed sensor (AT ISS) and the automatic transmission output shaft speed sensor (AT OSS) inputs.

Gear Slip Ratio
This parameter displays the calculated transmission gear slip ratio. The gear slip ratio is determined by comparing the calculated gear ratio to the desired gear ratio.

High Side Driver 2
This parameter displays Enabled/Disabled.

High Side Driver 2 CKT Status
This parameter displays OK, Open/Short to Volts, Short to GND.

Ignition Voltage
This parameter displays the system voltage measured at the ignition feed.

IMS
This parameter displays 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 or INVALID. The IMS Range display represents a decoded status of the four inputs from the IMS. The combination of IMS inputs are used to determine which position the manual valve is in at any time.

IMS A/B/C/P
This parameter displays the status of the four A/B/C/P inputs from the automatic transmission internal mode switch. I indicates an ignition voltage signal. LOW indicates a 0 voltage signal. The scan tool will display HI/LOW, HI/LOW, HI/LOW, HI/LOW.

ISS/OSS Supply Voltage
This parameter displays OK, Out of Range.

Last Shift Time
This parameter displays the actual time of the last upshift. This value is only accurate if the shift was adaptable.

Line PC Sol. CKT Status
This parameter displays whether an open, short to voltage or ground exists in the line pressure control (PC) solenoid valve feedback signal circuit. The scan tool displays OK, Open/Short to Volts, Short to GND.

Line PC Sol. Pressure Cmd.
This parameter displays results in kPa (psi).

Pass Counter
This parameter counts.

PC Sol. 2 CKT Status
This parameter displays OK, Open/Short to GND, Short to Volts.

PC Sol. Pressure Cmd.
This parameter displays kpa (psi).

PC Sol. 3 CKT Status
This parameter displays OK, Open/Short to GND, Short to Volts.

PC Sol. 3 Pressure Cmd.
This parameter displays kpa (psi).

PC Sol. 4 CKT Status
This parameter displays OK, Open/Short to GND, Short to Volts.

PC Sol. 4 Pressure Cmd.
This parameter displays kpa (psi).

PC Sol. 5 CKT Status
This parameter displays OK, Open/Short to GND, Short to Volts.

PC Sol. 5 Pressure Cmd.
This parameter displays kpa (psi).

Power Take-Off
This parameter displays when the Power Take-Off (PTO) is engaged. PTO mode disables all transmission diagnostics. The scan tool displays YES or NO.

Replicated OSS CKT Status
This parameter displays OK, Open, Short to GND, Short to Volts, Incomplete.

Shift Sol. 1 CKT Status
This parameter displays whether an open, short to voltage or ground exists in the shift solenoid valve 1 feedback signal circuit. The scan tool displays OK, Open/Short to Volts, Short to GND.

Shift Sol. 2 CKT Status
This parameter displays whether an open or short to voltage or ground exists in the 2-3, 3-4 shift solenoid valve (S2) feedback signal circuit. The scan tool displays OK, Open/Short to Volts, or Short to GND.

Shift Solenoid 1
This parameter displays the commanded state of the reverse, 1st shift solenoid valve (S1). The scan tool displays On/Off.

Shift Solenoid 2
This parameter displays the commanded state of the 2-3, 3-4 shift solenoid valve (S2). The scan tool displays On/Off.

TCC Brake Switch
This parameter displays the status of the TCC brake switch circuit input. OPEN indicates a zero voltage input, brake pedal applied. CLOSED indicates a voltage input, brake pedal released. The scan tool displays OPEN or CLOSED.

TCC PC Sol. CKT Status
This parameter displays whether an open or short to voltage or ground exists in the torque converter clutch (TCC) pressure control (PC) solenoid valve feedback signal circuit. The scan tool displays OK, Open/Short to Volts, Short to GND.

TCC PC Sol. Duty Cycle
This parameter displays the commanded On time of the torque converter clutch (TCC) solenoid valve. The scan tool displays On time in percentage. A reading of 100 percent represents an energized, commanded On state. A reading of 0 percent represents a non-energized commanded OFF state.

TCC PC Sol. Pressure Cmd.
This parameter displays results in kPa (psi).

TCC Pressure Actual
This parameter displays results in kPa (psi).

TCC Slip Speed
This parameter displays the difference between transmission input speed and engine speed. A negative value indicates the engine speed is less than the input speed, deceleration. A positive value indicates the engine speed is greater than the input speed, acceleration. A value of zero indicates the engine speed is equal to the input speed, TCC applied.

TCM Power-Up Temp.
This parameter displays results in °C (°F).

TCM Temperature
This parameter displays results in °C (°F).

TFP Switch 1
This parameter displays the state of the first clutch oil pressure switch. The scan tool displays HI/LOW.

TFP Switch 3
This parameter displays the state of the 3rd clutch oil pressure switch. The scan tool displays HI/LOW.

TFP Switch 4
This parameter displays the state of the 4th clutch oil pressure switch. The scan tool displays HI/LOW.

TFP Switch 5
This parameter displays the state of the fifth clutch oil pressure switch. The scan tool displays HI/LOW.

Torque Converter Efficiency
This parameter displays a ratio of 0.00:1 to 2:1. The ratio is calculated by multiplying the speed ratio by a value related to the "K factor" of the torque converter. The "K factor" is the looseness or tightness of the torque converter for a given torque. The nearer the torque converter is to full coupling, i.e. 1:1, the closer the torque converter efficiency number will be to 1.

Trans. Fluid Temp.
This parameter displays the input signal of the transmission fluid temperature sensor. Transmission fluid temperature is high, 151°C (304°F), when signal voltage is low, 0 volt. Transmission fluid temperature is low, -40°C (-40°F), when signal voltage is high, 5 volt.

Trans. Oil Life
This parameter displays the transmission oil life remaining. The scan tool displays remaining oil life in percentage. The transmission oil life calculation is based on transmission fluid temperature and engine run time.

Transfer Case Ratio
This parameter displays the ratio of the transfer case, calculated by engine speed, divided by transmission output speed based on transmission commanded gear.

Transmission Hot Mode
This parameter displays the automatic transmission fluid temperature (TFT) and displays On or Off. Off indicates that the TFT has not exceeded 130°C (266°F). On indicates that the TFT has exceeded 130°C (266°F) and has not cooled to 120°C (248°F) for greater that 5 seconds. These numbers are approximate and differ with transmissions.

Transmission ISS
This parameter displays the rotational speed of the transmission input shaft. The scan tool displays input shaft speed as revolutions per minute (RPM).

Transmission OSS
This parameter displays the rotational speed of the transmission output shaft. The scan tool displays output shaft speed as revolutions per minute (RPM).

Turbine Speed
This parameter displays the rotational speed of the torque converter turbine shaft, and is expressed as revolutions per minute (RPM). 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
This parameter displays the speed at which the vehicle is traveling. The scan tool displays vehicle speed as kilometers per hour (km/h), miles per hour (MPH). The vehicle speed is calculated based on the input signal from the automatic transmission output shaft speed sensor.