Scan Tool Data Definitions

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. The greater the negative number equals a longer shift.
1-2 Shift Time: Range 0.00 - 0.38 seconds. This parameter is the actual time of the last 1-2 shift. The time is measured from the start of the change in the ratio until the end of the change in the ratio.
1-2 Solenoid: Displays ON/OFF. This parameter indicates the status of the 1-2 shift solenoid valve. When the automatic transmission is in FIRST or FOURTH gear, the scan tool should display ON. When the transmission is in SECOND or THIRD gear, the scan tool should display OFF.
1-2 Solenoid Open/Short to GND: Displays YES or NO. This parameter indicates whether an open or short to ground exists in the 1-2 shift solenoid valve feedback signal to the PCM. The 1-2 shift solenoid valve must be commanded OFF for this parameter to work.
1-2 Solenoid Short to Volts: Displays YES or NO. This parameter indicates whether a short to power exists in the 1-2 shift solenoid valve feedback signal to the PCM. The 1-2 shift solenoid valve must be commanded ON for this parameter to work.
1-2 TAP Cell (4-16): Range: -207 to +207 kPa (-30 to +30 psi). The amount of adapt pressure, based on 17 Nm (12.5 ft. lbs.) of engine torque increment per cell, added or subtracted from shift pressure during a 1-2 upshift. A positive number indicates that the PCM has detected long shifts and has added PC solenoid pressure in order to decrease shift time. A negative number indicates that the PCM has detected short shifts and has subtracted PC solenoid pressure in order to increase shift time.
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. The greater the negative number equals a longer shift.
2-3 Shift Time: Range 0.00 - 6.38 seconds. This parameter is the actual time of the last 2-3 shift. The time is measured from the start of the change in the ratio, until the end of the change in the ratio.
2-3 Solenoid: Displays ON/OFF. This parameter indicates the status of the 2-3 shift solenoid valve. When the automatic transmission is in FIRST or SECOND gear, the scan tool should display ON. When the transmission is in THIRD or FOURTH gear, the scan tool should display OFF.
2-3 Solenoid Open/Short to GND: Displays YES or NO. This parameter indicates whether an open or short to ground exists in the 2-3 shift solenoid valve feedback signal to the PCM. The 2-3 shift solenoid valve must be commanded OFF for this parameter to work.
2-3 Solenoid Short to Volts: Displays YES or NO. This parameter indicates whether a short to power exists in the 2-3 shift solenoid valve feedback signal to the PCM. The 2-3 shift solenoid valve must be commanded ON for this parameter to work.
2-3 TAP Cell (4-16): Range: -207 to +207 kPa (-30 to +30 psi). The amount of adapt pressure, based on 17 Nm (12.5 ft. lbs.) of engine torque increment per cell, added or subtracted from shift pressure during a 2-3 upshift. A positive number indicates that the PCM has detected long shifts and has added PC solenoid pressure in order to decrease shift time. A negative number indicates that the PCM has detected short shifts and has subtracted PC solenoid pressure in order to increase shift time.
3-4 Shift Error: Displays a range of -6.38 to +6.38 seconds. This parameter is the difference between the desired 3 - shift time and the actual 3-4 shift time. The greater the negative number equals a longer shift.
3-4 Shift Time:Range 0.00 - 6.38 seconds. This parameter is the actual time of the last 3-4 shift. The time is measured from the start of the change in the ratio until the end of the change in the ratio.
3-4 TAP Cell (4-16): Range: -207 to +207 kPa (-30 to +30 psi). The amount of adapt pressure, based on 17 Nm (12.5 ft. lbs.) of engine torque increment per cell, added or subtracted from shift pressure during a 3-4 upshift. A positive number indicates that the PCM has detected long shifts and has added PC solenoid pressure in order to decrease shift time. A negative number indicates that the PCM has detected short shifts and has subtracted PC solenoid pressure in order to increase shift time.
A/C Clutch: Displays ON/OFF. This parameter indicates the commanded state of the A/C control relay. The clutch should be engaged when ON is displayed.
Brake Switch: Displays OPEN/CLOSED. This parameter indicates the state of the 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 released).
Cruise: Displays ENABLED/DISABLED. This parameter indicates whether the PCM is allowing cruise operation. The PCM has the ability to disable cruise control under certain conditions.
Current Gear: Displays 1, 2, 3 or 4. This parameter indicates the current command state of the shift solenoid valves.
Current TAP Cell: Displays Cells 4-16. This parameter indicates the current torque cell, which is being used for fluid line pressure adaptation.
Current TAP Memory: Range -207 to +207 kPa (-30 to +30 psi). This parameter is the amount of current transmission adaptive pressure that is added to the base line pressure in order to adjust the holding effort of a clutch or a band, while not engine braking.
ECT:Range -40° C to 151° C (-40° F to 304° F). This parameter is the input signal from the ECT sensor. Engine coolant temperature is high at 151° C (304° F) when the signal voltage is low (0 V). Engine coolant temperature is low at -40° C (-40° F) when the signal voltage is high (5 V).
Engine Run Time: Flange 0:00:00-18:12:15. This parameter is a measure in Hr:Min:Sec of how long the engine has been operating. When the ignition is cycled to OFF, the value is reset to zero.
Engine Speed: Range 0.00 - 8192 RPM. The PCM computes the engine speed from the fuel control reference input. This speed should remain close to the desired idle under various engine loads with the engine idling.
Engine Torque: Range 0 - 510 Nm. This display indicates the amount of torque that is delivered from the engine.
Gear Ratio: Range 0.00 to 3.98:1. This parameter is the actual transmission gear ratio. The ratio is calculated from the AT ISS and the AT OSS sensors.
Hot Mode: Displays ON/OFF. This parameter monitors the transmission temperature. OFF indicates that the transmission temperature has not exceeded 135° C (275° F). ON indicates that the transmission temperature has exceeded 140° C (284° F).
Ignition Voltage: Range 0.0 - 15.0 V. This parameter represents the system voltage, which is measured by the PCM at its ignition feed.
Last Shift Time: Range 0.00 - 6.38 seconds. This parameter is the actual shift time of the last upshift.
PC Solenoid Actual Current: Range 0.00 - 4.98 amps. This parameter is the actual current of the PC solenoid valve circuit at the PCM. A reading of 0.00 amps (no current is flowing) indicates an actual high line pressure. A reading of 1.18 amps (a high flow of current) indicates an actual low line pressure.
PC Solenoid Duty Cycle: Range 0 - 100%. This parameter is the commanded state of the PC solenoid valve, which is expressed as a percent of it's energized ON time. A reading of 0% indicates zero ON time (a non-energized commanded OFF state). A reading of 100% represents an energized commanded ON state.
PC Solenoid Ref. Current: Range 0.00 - 4.98 amps. This parameter is the commanded (reference) current of the PC solenoid valve circuit. A reading of 0.00 amps (no current is flowing) indicates a commanded high line pressure. A reading of 1.18 amps (a high flow of current) indicates a commanded low line pressure.
Steady State TAP 1GR (Transmission Adapt Pressure 1st Gear):Displays a range of 0 - 876 kPa (0 - 127 psi). This parameter indicates a pressure modification, which is added to the line pressure in 1st gear when the PCM detects a worn or slipping component
Steady State TAP 2GR (Transmission Adapt Pressure 2nd Gear):Displays a range of 0 - 876 kPa (0 - 127 psi). This parameter indicates a pressure modification, which is added to the line pressure in 2nd gear when the PCM detects a worn or slipping component.
Steady State TAP 2GR w/TCC: Displays a range of 0-876 kPa (0 - 127 psi).This parameter 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.
Steady State TAP 3GR (Transmission Adapt Pressure 3rd Gear):Displays a range of 0 - 876 kPa (0 - 127 psi). This parameter indicates a pressure modification, which is added to the line pressure in 3rd gear when the PCM detects a worn or slipping component.
Steady State TAP 3GR w/TCC: Displays a range of 0 - 876 kPa (0 - 127 psi). This parameter 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.
Steady State TAP 4GR (Transmission Adapt Pressure 4th Gear):Displays a range of 0 - 876 kPa (0 - 127 psi). This parameter indicates a pressure modification, which is added to the line pressure in 4th gear when the PCM detects a worn or slipping component.
Steady State TAP 4GR w/1 CC: Displays a range of 0 - 876 kPa (0 - 127 psi).This parameter indicates a pressure modification, which is added to the line pressure in 4th gear with TCC applied when the PCM detects a worn or slipping component.
Steady State TAP Reverse:Displays a range of 0 - 876 kPa (0 - 127 psi). This parameter indicates a pressure modification, which is added to the line pressure in Reverse when the PCM detects a worn or slipping component.
TCC Duty Cycle: Range 0 - 100%. This parameter is the commanded percentage of ON time of the TCC solenoid valve. A reading of 100% represents an ON (energized) commanded state. A reading of 0% represents a non-energized commanded OFF state.
TCC Duty Cycle Open/Short to GND: Displays YES or NO. This parameter indicates whether an open or short to ground exists in the TCC PWM solenoid valve feedback signal to the PCM. The TCC PWM solenoid valve must be commanded OFF for this parameter to work. The scan tool will display YES only while the TCC PWM solenoid valve is OFF. The display will pulsate.
TCC Duty Cycle Short to Volts: Displays YES or NO. This parameter indicates whether a short to power exists in the TCC PWM solenoid valve feedback signal to the PCM. The TCC PWM solenoid valve must be commanded ON for this parameter to work. The scan tool will display YES only while the TCC PWM solenoid valve is ON. The display will pulsate.
TCC Release Pressure: Displays YES/NO. This parameter monitors the normally closed TCC release switch. When TCC release fluid pressure is present, then the switch is open, indicating that the TCC is released. When the fluid pressure is not present, then the switch is closed, indicating that the TCC is applied.
TCC Slip Speed: Range -4095 to +4095. This parameter displays the amount of slip in RPM between the engine and the transmission input shaft.
TFP Switch: Displays Park/Neutral, Reverse, Drive 4, Drives, Drive 2, Drive 1 or invalid. This parameter is the decoded status of the three A/B/C inputs from the automatic transmission fluid pressure manual valve position switch. If a valid combination of inputs is not seen by the PCM, invalid will be displayed.
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. HI represents a B+ voltage signal and LOW represents a 0 voltage signal.
TFT Sensor: Displays a range of 0.00 - 5.00 volts. This parameter shows the voltage drop across the TFT sensor circuit. The PCM applies 5 volts to the TFT sensor circuit. The sensor is a thermistor which changes internal resistance as the temperature changes. When the sensor is cold (the internal resistance is high), the PCM monitors a high signal voltage. The PCM interprets this voltage as a cold transmission. As the sensor warms (the internal resistance decreases), the voltage signal will decrease. The PCM interprets the lower voltage as a warm transmission.
TP Angle: Range 0 - 100%. The PCM computes TP angle from the input of the TP sensor voltage. The TP angle is automatically set to 0% at idle (TP voltage is below 0.90 volt) and reads 100% at WOT.
TP Sensor: Range 0 - 5.0 V. The TP sensor is used by the PCM in order to determine the amount of throttle demanded by the operator of the vehicle. The TP sensor reads between 0.20 - 0.90 volt at idle to above 4 volts at WOT.
TR Switch: Displays Park/Neutral, Reverse, Drive4, Drives, 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.
TR Switch 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.
Traction Control:Displays Active or Inactive. When the PCM receives a request for torque reduction from the Electronic Brake Traction Control Module (EBTCM) Active is displayed.
Trans. Fluid Temp.: Range -40° C to 151° C (-40° F to 304° F). The PCM converts the resistance of the TFT sensor into degrees. Transmission temperature is used in order to determine Hot Mode TCC operation and to modify the commanded transmission pressure.
Transmission ISS: Range 0.00 - 8192 RPM. This parameter indicates the rotational speed of the automatic transmission input (shaft) speed sensor, which is expressed as Revolutions Per Minute (RPM).
Transmission OSS: Range 0.00 - 8192 RPM. This parameter indicates the rotational speed of the automatic transmission output (shaft) speed sensor, which is expressed as Revolutions Per Minute (RPM).
Vehicle Speed: Range 0.00 - 255 mph. This parameter is the input signal from the AT OSS sensor.