For 1990-2009 cars
1-2 Shift Error: 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: 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 Sol.: The 1-2 Solenoid parameter 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 Sol. Open/Short to GND: The 1-2 Solenoid Open/Short to Ground parameter 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 Sol. Short to Volts: The 1-2 Solenoid Short to Volts parameter 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): The 1-2 Transmission Adaptive Pressure (TAP) Cell parameter displays the amount of adapt pressure, based on 17 N·m (12.5 lb ft) 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: 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: 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 Sol.: The 2-3 Solenoid parameter 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 Sol. Open/Short to GND: The 2-3 Solenoid Open/Short to Ground parameter 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 Sol. Short to Volts: The 2-3 Solenoid Short to Volts parameter 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): The 2-3 Transmission Adaptive Pressure (TAP) Cell parameter displays the amount of adapt pressure, based on 17 N·m (12.5 lb ft) 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: This parameter is the difference between the desired 3-4 shift time and the actual 3-4 shift time. The greater the negative number equals a longer shift.
3-4 Shift Time: 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): The 3-4 Transmission Adaptive Pressure (TAP) Cell parameter displays the amount of adapt pressure, based on 17 N·m (12.5 lb ft) 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.
Brake Switch: The Brake Switch parameter displays APPLIED/RELEASED. This parameter indicates the state of the brake switch circuit input. RELEASED indicates a zero voltage input, the brake switch is open and the brake pedal is released. APPLIED indicates a B+ voltage input, the brake switch is closed and the brake pedal is applied.
Commanded Gear/ Current Gear: Displays 1, 2, 3 or 4. This parameter indicates the current command state of the shift solenoid valves.
ECT: The Engine Coolant Temperature (ECT) 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 Speed: 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: This display indicates the amount of torque that is delivered from the engine.
Gear Ratio: This parameter is the actual transmission gear ratio. The ratio is calculated from the AT ISS and the AT OSS sensors.
Ignition 1: This parameter represents the system voltage which is measured by the PCM at its ignition feed.
PC Sol. Actual Current: The Pressure Control (PC) Solenoid Actual Current 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: The Pressure Control (PC) Solenoid Duty Cycle 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 percent indicates zero ON time, a non-energized commanded OFF state. A reading of 100 percent represents an energized commanded ON state.
PC Sol. Ref. Current: The Pressure Control (PC) Solenoid Reference Current 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.
TCC Duty Cycle: The Torque Converter Clutch (TCC) Duty Cycle parameter is the commanded percentage of ON time of the TCC solenoid valve. A reading of 100 percent represents an ON, energized, commanded state. A reading of 0 percent represents a non-energized commanded OFF state.
TCC Duty Cycle Open/Short to GND: The Torque Converter Clutch (TCC) Duty Cycle Open/Short to Ground parameter 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: The Torque Converter Clutch (TCC) Duty Cycle Short to Volts parameter 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: The Torque Converter Clutch (TCC) Release Pressure parameter 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: The Torque Converter Clutch (TCC) Slip Speed parameter displays the amount of slip in RPM between the engine and the transmission input shaft.
TFP Sw.: The Transmission Fluid Pressure (TFP) Switch parameter displays Park/Neutral, Reverse, Drive4, Drive3, Drive2, Drive1 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 Sw. A/B/C: The Transmission Fluid Pressure (TFP) Switch A/B/C parameter 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: The Transmission Fluid Temperature (TFT) Sensor 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: The Throttle Position (TP) Angle parameter displays the angle of the throttle. The PCM computes TP angle from the input of the TP sensor voltage. The TP angle is automatically set to 0 percent at idle.
TR Sw.: The Transmission Range (TR) Switch parameter 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.
TR Sw. P/A/B/C: The Transmission Range (TR) Switch PA/B/C parameter 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/TCM. LOW indicates a zero voltage input to the PCM/TCM.
Trans. Fluid Temp.: The Transmission Fluid Temperature parameter displays the temperature of the transmission fluid. 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.
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).
Transmission ISS: The Transmission Input Shaft Speed (ISS) Sensor parameter indicates the rotational speed of the automatic transmission input shaft speed sensor, which is expressed as revolutions per minute (RPM).
Transmission OSS: The Transmission Output Shaft Speed (OSS) Sensor parameter indicates the rotational speed of the automatic transmission output shaft speed sensor which is expressed as revolutions per minute (RPM).
Vehicle Speed: This parameter is the input signal from the AT OSS.