For 1990-2009 cars only
1-2 Shift Error: This parameter is the difference
between the desired 1-2 shift time and the actual 1-2 shift
time. A negative number equals a longer shift time.
1-2 Shift Time: This parameter is the actual shift time of the last 1-2 shift. The shift time is based on a gear box ratio change after the commanded 1-2 shift.
1-2 Sol.: The 1- 2 solenoid parameter displays the commanded state of the 1-2 shift solenoid valve. On indicates a commanded energized solenoid state, and Off indicates a commanded non-energized solenoid state.
1-2 Sol. Open/Short to GND: The 1-2 solenoid open/short to ground parameter indicates whether an open or a short to ground exists in the 1-2 shift solenoid valve feedback signal to the PCM and displays Yes or No. The 1-2 shift solenoid valve must be commanded Off for this parameter to be valid.
1-2 Sol. Short to Volts: The 1-2 solenoid short to volts parameter indicates whether a short to battery, B+, exists in the 1-2 shift solenoid valve feedback signal to the PCM and displays Yes or No. The 1-2 shift solenoid valve must be commanded On for this parameter to be valid.
1-2 TAP Cell (4-16): This parameter displays the amount of transmission adaptive pressure (TAP), based on 17 N·m (12.5 lb ft) of engine torque increment per cell, added to or subtracted from shift pressure during a 1-2 upshift. A large positive number means the PCM has seen several long shifts and has added PC solenoid pressure in order to decrease the shift time. A large negative number means the PCM has seen several short shifts and has removed PC solenoid pressure in order to increase the 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. A negative number equals a longer shift time.
2-3 Shift Time: This parameter is the actual shift time of the last 2-3 shift. The shift time is based on a gear box ratio change after the commanded 2-3 shift.
2-3 Sol.: The 2-3 solenoid parameter displays the commanded state of the 2-3 shift solenoid valve. On indicates a commanded energized state, and Off indicates a commanded non-energized state.
2-3 Sol. Open/Short to GND: The 2-3 solenoid open/short to ground parameter indicates whether an open or a short to ground exists in the 2-3 shift solenoid valve feedback signal to the PCM and displays Yes or No. The 2-3 shift solenoid valve must be commanded Off for this parameter to be valid.
2-3 Sol. Short to Volts: The 2-3 solenoid short to volts parameter indicates whether a short to battery, B+, exists in the 2-3 shift solenoid valve feedback signal to the PCM and displays Yes or No. The 2-3 shift solenoid valve must be commanded On for this parameter to be valid.
2-3 TAP Cell (4-16): This parameter displays the amount of transmission adaptive pressure (TAP), based on 17 N·m (12.5 lb ft) of engine torque increment per cell, added to or subtracted from shift pressure during a 2-3 upshift. A large positive number means the PCM has seen several long shifts and has added PC solenoid pressure in order to decrease the shift time. A large negative number means the PCM has seen several short shifts and has removed PC solenoid pressure in order to increase the 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. A negative number equals a longer shift time.
3-4 Shift Time: This parameter is the actual shift time of the last 3-4 shift. The shift time is based on a gear box ratio change after the commanded 3-4 shift.
3-4 TAP Cell (4-16): This parameter displays the amount of transmission adaptive pressure (TAP), based on 17 N·m (12.5 lb ft) of engine torque increment per cell, added to or subtracted from shift pressure during a 3-4 upshift. A large positive number means the PCM has seen several long shifts and has added PC solenoid pressure in order to decrease the shift time. A large negative number means the PCM has seen several short shifts and has removed PC solenoid pressure in order to increase the shift time.
A/C Clutch: This parameter indicates the PCM commanded state of the air conditioning (A/C) compressor clutch relay driver circuit and displays On or Off. The A/C compressor clutch should be engaged when On displays. When the display indicates On, the line pressure and the shift times will be adjusted for the additional engine load.
Commanded Gear: This parameter indicates the current commanded state of the shift solenoid valves.
Cruise: This parameter displays Enabled or Disabled. When the display indicates Enabled, the PCM is allowing cruise control operation. When the display indicates Disabled, the PCM has disabled cruise control operation. The PCM has the ability to disable cruise control under certain conditions. When the cruise control is On, shift patterns will be altered for 2-3 and 3-4 upshifts and for 4-3 and 3-2 downshifts.
Current TAP Cell: This parameter indicates the current transmission adaptive pressure (TAP) cell in use for transmission line pressure adaptation. The scan tool displays cells 4-16. The cells are based on 17 N·m (12.5 lb ft) of 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: The engine coolant temperature (ECT) sensor is mounted in the coolant stream and sends engine temperature information to the PCM. The PCM applies 5 volts to the ECT sensor circuit. The sensor is a thermistor that changes internal resistance as 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 engine. As the sensor warms, the internal resistance decreases, the voltage signal will decrease. The PCM interprets the lower voltage as a warm engine.
Engine Run Time: This parameter indicates the time elapsed since the engine was started and is displayed in hours/minutes/seconds. If the engine is stopped, this parameter is reset to 00:00:00.
Engine Speed: This parameter indicates the rotational speed of the engine expressed as revolutions per minute. The engine speed is computed by the PCM from the fuel control reference input, the crankshaft position sensor.
Engine Torque: This parameter indicates the amount of torque being delivered by the engine and is displayed in both English and metric units.
Gear Ratio: This parameter displays the actual transmission gear ratio as the transmission operates through all DRIVE, REVERSE and PARK/NEUTRAL ranges.
Ignition Voltage: This parameter is the system voltage measured by the PCM at the PCM ignition input when the ignition switch is in the ON position.
IMS: The internal mode switch (IMS) 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, Invalid or Open. The IMS Range display represents a decoded status of the four inputs from the IMS. This range includes all possible in-between gear states as well as the detent gear states. The combination of IMS inputs to the PCM are used by the PCM in order to determine what position the manual valve is in at any time.
IMS A/B/C/P: The internal mode switch (IMS) A/B/C/P parameter displays LOW or HI for the state of each of the four inputs from the IMS. LOW displayed indicates a low voltage signal, 0 volts, being monitored at the PCM. HI displayed indicates a high voltage signal, B+, being monitored at the PCM.
Last Shift Time: This parameter is the actual shift time of the last upshift.
PC Sol. Actual Current: The pressure control (PC) solenoid actual current parameter displays the actual current flow through the PC solenoid valve circuit, as measured by the PCM. Low current flow indicates high line pressure. High current flow indicates low line pressure.
PC Solenoid Duty Cycle: The pressure control (PC) solenoid duty cycle parameter indicates the commanded state of the PC solenoid valve circuit, expressed as a percentage of ON time, energized. A 0 percent duty cycle indicates no current flow, zero ON time. High current flow is approximately 60 percent duty cycle at idle.
PC Sol. Ref. Current: The pressure control (PC) solenoid reference current parameter displays the current flow commanded by the PCM through the PC solenoid valve circuit. Low current flow indicates high line pressure. High current flow indicates low line pressure.
Steady State TAP 1GR: The steady state transmission adaptive pressure (TAP) first gear, 1GR, parameter displays the amount of pressure used to help prevent transmission component slip. By analyzing the transmission gear ratio when commanding first gear, the PCM will command additional line pressure in order to maintain correct first gear ratio. The amount of additional pressure is determined by the PCM and is used to increase the base line pressure. The larger the value, the greater the increase to line pressure.
Steady State TAP 2GR: The steady state transmission adaptive pressure (TAP) second gear, 2GR, parameter displays the amount of pressure used to help prevent transmission component slip. By analyzing the transmission gear ratio when commanding second gear, the PCM will command additional line pressure in order to maintain correct second gear ratio. The amount of additional pressure is determined by the PCM and is used to increase the base line pressure. The larger the value, the greater the increase to line pressure.
Steady State TAP 2GR/TCC: The steady state transmission adaptive pressure (TAP) second gear, 2GR, with torque converter clutch (TCC) apply parameter displays the amount of pressure used to help prevent transmission component slip. By analyzing the transmission gear ratio when commanding second gear and the TCC ON, the PCM will command additional line pressure in order to maintain correct second gear ratio with the TCC applied. The amount of additional pressure is determined by the PCM and is used to increase the base line pressure. The larger the value, the greater the increase to line pressure.
Steady State TAP 3GR: The steady state transmission adaptive pressure (TAP) third gear, 3GR, parameter displays the amount of pressure used to help prevent transmission component slip. By analyzing the transmission gear ratio when commanding third gear, the PCM will command additional line pressure in order to maintain correct third gear ratio. The amount of additional pressure is determined by the PCM and is used to increase the base line pressure. The larger the value, the greater the increase to line pressure.
Steady State TAP 3GR/TCC: The steady state transmission adaptive pressure (TAP) third gear, 3GR, with torque converter clutch (TCC) apply parameter displays the amount of pressure used to help prevent transmission component slip. By analyzing the transmission gear ratio when commanding third gear and the TCC ON, the PCM will command additional line pressure in order to maintain correct third gear ratio with the TCC applied. The amount of additional pressure is determined by the PCM and is used to increase the base line pressure. The larger the value, the greater the increase to line pressure.
Steady State TAP 4GR: The steady state transmission adaptive pressure (TAP) fourth gear, 4GR, parameter displays the amount of pressure used to help prevent transmission component slip. By analyzing the transmission gear ratio when commanding fourth gear, the PCM will command additional line pressure in order to maintain correct fourth gear ratio. The amount of additional pressure is determined by the PCM and is used to increase the base line pressure. The larger the value, the greater the increase to line pressure.
Steady State TAP 4GR/TCC: The steady state transmission adaptive pressure (TAP) fourth gear, 4GR, with torque converter clutch (TCC) apply parameter displays the amount of pressure used to help prevent transmission component slip. By analyzing the transmission gear ratio when commanding fourth gear and the TCC ON, the PCM will command additional line pressure in order to maintain correct fourth gear ratio with the TCC applied. The amount of additional pressure is determined by the PCM and is used to increase the base line pressure. The larger the value, the greater the increase to line pressure.
Steady State TAP Reverse: The steady state transmission adaptive pressure (TAP) reverse gear parameter displays the amount of pressure used to help prevent transmission component slip. By analyzing the transmission gear ratio when commanding reverse gear, the PCM will command additional line pressure in order to maintain correct reverse gear ratio. The amount of additional pressure is determined by the PCM and is used to increase the base line pressure. The larger the value, the greater the increase to line pressure.
TCC Brake Switch: The torque converter clutch (TCC) brake switch parameter displays Open/Closed. When the brake pedal is applied, the TCC brake switch sends a signal to the PCM to disengage the TCC and disable cruise control.
TCC Duty Cycle: The torque converter clutch (TCC) duty cycle parameter indicates the commanded percent of the TCC PWM solenoid valve On time. A value of 20 percent represents an energized commanded state and a value of 0 percent represents a de-energized commanded state. The commanded state is applied at vehicle speeds that are above approximately 16 km/h (10 mph).
TCC Duty Cycle Open/Short to GND: The torque converter clutch (TCC) duty cycle open/short to ground parameter indicates whether an open or a short to ground exists in the TCC PWM solenoid valve feedback signal to the PCM and displays Yes or No. The TCC PWM solenoid valve must be commanded Off for this parameter to be valid. 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 indicates whether a short to battery, B+, exists in the TCC PWM solenoid valve feedback signal to the PCM and displays Yes or No. The TCC PWM solenoid valve must be commanded On for this parameter to be valid. 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 indicates the status of the normally-closed TCC release switch and displays Yes or No. A scan tool displaying Yes indicates the switch is open, TCC release fluid pressure is present and the TCC is released. A scan tool displaying No indicates the switch is closed, TCC release fluid pressure is not present and the TCC is applied.
TCC Slip Speed: The torque converter clutch (TCC) slip speed parameter displays the difference between the transmission input shaft RPM and the engine RPM. A negative value indicates deceleration. A value of near zero indicates that the TCC is applied.
TFT Sensor: The transmission fluid temperature (TFT) sensor parameter displays the voltage drop across the TFT sensor. The PCM applies 5 volts to the TFT sensor circuit. The sensor is a thermistor that 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) parameter displays a percentage that is computed by the PCM from the TP sensor voltage. The TP angle should display 0 percent at idle and 100 percent at wide open throttle (WOT).
TP Sensor: The throttle position (TP) sensor parameter indicates the voltage being monitored by the PCM on the TP sensor signal circuit.
Traction Control: This parameter displays Active or Inactive. The scan tool displays Active when the PCM receives a request for torque reduction from the electronic brake traction control module (EBTCM).
Trans. Fluid Temp.: The transmission fluid temperature parameter displays the temperature conversion of the voltage input signal to the PCM from the transmission fluid temperature (TFT) sensor. When the TFT is high, 151°C (304°F), the signal voltage is low, 0 volts. When the TFT is low, -40°C (-40°F), the signal voltage is high, 5 volts.
Transmission Hot Mode: This parameter indicates 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 more that 5 seconds. Note: these numbers are approximate. They differ with transmissions.
Transmission ISS: The transmission input shaft speed parameter displays the rotational speed of the transmission input shaft as expressed in revolutions per minute.
Transmission OSS: The transmission output shaft speed parameter displays the rotational speed of the transmission output shaft as expressed in revolutions per minute.
Vehicle Speed: This parameter is the vehicle speed sensor (VSS) input signal converted by the PCM to be displayed as vehicle speed in both metric and English units.
1-2 Shift Time: This parameter is the actual shift time of the last 1-2 shift. The shift time is based on a gear box ratio change after the commanded 1-2 shift.
1-2 Sol.: The 1- 2 solenoid parameter displays the commanded state of the 1-2 shift solenoid valve. On indicates a commanded energized solenoid state, and Off indicates a commanded non-energized solenoid state.
1-2 Sol. Open/Short to GND: The 1-2 solenoid open/short to ground parameter indicates whether an open or a short to ground exists in the 1-2 shift solenoid valve feedback signal to the PCM and displays Yes or No. The 1-2 shift solenoid valve must be commanded Off for this parameter to be valid.
1-2 Sol. Short to Volts: The 1-2 solenoid short to volts parameter indicates whether a short to battery, B+, exists in the 1-2 shift solenoid valve feedback signal to the PCM and displays Yes or No. The 1-2 shift solenoid valve must be commanded On for this parameter to be valid.
1-2 TAP Cell (4-16): This parameter displays the amount of transmission adaptive pressure (TAP), based on 17 N·m (12.5 lb ft) of engine torque increment per cell, added to or subtracted from shift pressure during a 1-2 upshift. A large positive number means the PCM has seen several long shifts and has added PC solenoid pressure in order to decrease the shift time. A large negative number means the PCM has seen several short shifts and has removed PC solenoid pressure in order to increase the 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. A negative number equals a longer shift time.
2-3 Shift Time: This parameter is the actual shift time of the last 2-3 shift. The shift time is based on a gear box ratio change after the commanded 2-3 shift.
2-3 Sol.: The 2-3 solenoid parameter displays the commanded state of the 2-3 shift solenoid valve. On indicates a commanded energized state, and Off indicates a commanded non-energized state.
2-3 Sol. Open/Short to GND: The 2-3 solenoid open/short to ground parameter indicates whether an open or a short to ground exists in the 2-3 shift solenoid valve feedback signal to the PCM and displays Yes or No. The 2-3 shift solenoid valve must be commanded Off for this parameter to be valid.
2-3 Sol. Short to Volts: The 2-3 solenoid short to volts parameter indicates whether a short to battery, B+, exists in the 2-3 shift solenoid valve feedback signal to the PCM and displays Yes or No. The 2-3 shift solenoid valve must be commanded On for this parameter to be valid.
2-3 TAP Cell (4-16): This parameter displays the amount of transmission adaptive pressure (TAP), based on 17 N·m (12.5 lb ft) of engine torque increment per cell, added to or subtracted from shift pressure during a 2-3 upshift. A large positive number means the PCM has seen several long shifts and has added PC solenoid pressure in order to decrease the shift time. A large negative number means the PCM has seen several short shifts and has removed PC solenoid pressure in order to increase the 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. A negative number equals a longer shift time.
3-4 Shift Time: This parameter is the actual shift time of the last 3-4 shift. The shift time is based on a gear box ratio change after the commanded 3-4 shift.
3-4 TAP Cell (4-16): This parameter displays the amount of transmission adaptive pressure (TAP), based on 17 N·m (12.5 lb ft) of engine torque increment per cell, added to or subtracted from shift pressure during a 3-4 upshift. A large positive number means the PCM has seen several long shifts and has added PC solenoid pressure in order to decrease the shift time. A large negative number means the PCM has seen several short shifts and has removed PC solenoid pressure in order to increase the shift time.
A/C Clutch: This parameter indicates the PCM commanded state of the air conditioning (A/C) compressor clutch relay driver circuit and displays On or Off. The A/C compressor clutch should be engaged when On displays. When the display indicates On, the line pressure and the shift times will be adjusted for the additional engine load.
Commanded Gear: This parameter indicates the current commanded state of the shift solenoid valves.
Cruise: This parameter displays Enabled or Disabled. When the display indicates Enabled, the PCM is allowing cruise control operation. When the display indicates Disabled, the PCM has disabled cruise control operation. The PCM has the ability to disable cruise control under certain conditions. When the cruise control is On, shift patterns will be altered for 2-3 and 3-4 upshifts and for 4-3 and 3-2 downshifts.
Current TAP Cell: This parameter indicates the current transmission adaptive pressure (TAP) cell in use for transmission line pressure adaptation. The scan tool displays cells 4-16. The cells are based on 17 N·m (12.5 lb ft) of 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: The engine coolant temperature (ECT) sensor is mounted in the coolant stream and sends engine temperature information to the PCM. The PCM applies 5 volts to the ECT sensor circuit. The sensor is a thermistor that changes internal resistance as 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 engine. As the sensor warms, the internal resistance decreases, the voltage signal will decrease. The PCM interprets the lower voltage as a warm engine.
Engine Run Time: This parameter indicates the time elapsed since the engine was started and is displayed in hours/minutes/seconds. If the engine is stopped, this parameter is reset to 00:00:00.
Engine Speed: This parameter indicates the rotational speed of the engine expressed as revolutions per minute. The engine speed is computed by the PCM from the fuel control reference input, the crankshaft position sensor.
Engine Torque: This parameter indicates the amount of torque being delivered by the engine and is displayed in both English and metric units.
Gear Ratio: This parameter displays the actual transmission gear ratio as the transmission operates through all DRIVE, REVERSE and PARK/NEUTRAL ranges.
Ignition Voltage: This parameter is the system voltage measured by the PCM at the PCM ignition input when the ignition switch is in the ON position.
IMS: The internal mode switch (IMS) 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, Invalid or Open. The IMS Range display represents a decoded status of the four inputs from the IMS. This range includes all possible in-between gear states as well as the detent gear states. The combination of IMS inputs to the PCM are used by the PCM in order to determine what position the manual valve is in at any time.
IMS A/B/C/P: The internal mode switch (IMS) A/B/C/P parameter displays LOW or HI for the state of each of the four inputs from the IMS. LOW displayed indicates a low voltage signal, 0 volts, being monitored at the PCM. HI displayed indicates a high voltage signal, B+, being monitored at the PCM.
Last Shift Time: This parameter is the actual shift time of the last upshift.
PC Sol. Actual Current: The pressure control (PC) solenoid actual current parameter displays the actual current flow through the PC solenoid valve circuit, as measured by the PCM. Low current flow indicates high line pressure. High current flow indicates low line pressure.
PC Solenoid Duty Cycle: The pressure control (PC) solenoid duty cycle parameter indicates the commanded state of the PC solenoid valve circuit, expressed as a percentage of ON time, energized. A 0 percent duty cycle indicates no current flow, zero ON time. High current flow is approximately 60 percent duty cycle at idle.
PC Sol. Ref. Current: The pressure control (PC) solenoid reference current parameter displays the current flow commanded by the PCM through the PC solenoid valve circuit. Low current flow indicates high line pressure. High current flow indicates low line pressure.
Steady State TAP 1GR: The steady state transmission adaptive pressure (TAP) first gear, 1GR, parameter displays the amount of pressure used to help prevent transmission component slip. By analyzing the transmission gear ratio when commanding first gear, the PCM will command additional line pressure in order to maintain correct first gear ratio. The amount of additional pressure is determined by the PCM and is used to increase the base line pressure. The larger the value, the greater the increase to line pressure.
Steady State TAP 2GR: The steady state transmission adaptive pressure (TAP) second gear, 2GR, parameter displays the amount of pressure used to help prevent transmission component slip. By analyzing the transmission gear ratio when commanding second gear, the PCM will command additional line pressure in order to maintain correct second gear ratio. The amount of additional pressure is determined by the PCM and is used to increase the base line pressure. The larger the value, the greater the increase to line pressure.
Steady State TAP 2GR/TCC: The steady state transmission adaptive pressure (TAP) second gear, 2GR, with torque converter clutch (TCC) apply parameter displays the amount of pressure used to help prevent transmission component slip. By analyzing the transmission gear ratio when commanding second gear and the TCC ON, the PCM will command additional line pressure in order to maintain correct second gear ratio with the TCC applied. The amount of additional pressure is determined by the PCM and is used to increase the base line pressure. The larger the value, the greater the increase to line pressure.
Steady State TAP 3GR: The steady state transmission adaptive pressure (TAP) third gear, 3GR, parameter displays the amount of pressure used to help prevent transmission component slip. By analyzing the transmission gear ratio when commanding third gear, the PCM will command additional line pressure in order to maintain correct third gear ratio. The amount of additional pressure is determined by the PCM and is used to increase the base line pressure. The larger the value, the greater the increase to line pressure.
Steady State TAP 3GR/TCC: The steady state transmission adaptive pressure (TAP) third gear, 3GR, with torque converter clutch (TCC) apply parameter displays the amount of pressure used to help prevent transmission component slip. By analyzing the transmission gear ratio when commanding third gear and the TCC ON, the PCM will command additional line pressure in order to maintain correct third gear ratio with the TCC applied. The amount of additional pressure is determined by the PCM and is used to increase the base line pressure. The larger the value, the greater the increase to line pressure.
Steady State TAP 4GR: The steady state transmission adaptive pressure (TAP) fourth gear, 4GR, parameter displays the amount of pressure used to help prevent transmission component slip. By analyzing the transmission gear ratio when commanding fourth gear, the PCM will command additional line pressure in order to maintain correct fourth gear ratio. The amount of additional pressure is determined by the PCM and is used to increase the base line pressure. The larger the value, the greater the increase to line pressure.
Steady State TAP 4GR/TCC: The steady state transmission adaptive pressure (TAP) fourth gear, 4GR, with torque converter clutch (TCC) apply parameter displays the amount of pressure used to help prevent transmission component slip. By analyzing the transmission gear ratio when commanding fourth gear and the TCC ON, the PCM will command additional line pressure in order to maintain correct fourth gear ratio with the TCC applied. The amount of additional pressure is determined by the PCM and is used to increase the base line pressure. The larger the value, the greater the increase to line pressure.
Steady State TAP Reverse: The steady state transmission adaptive pressure (TAP) reverse gear parameter displays the amount of pressure used to help prevent transmission component slip. By analyzing the transmission gear ratio when commanding reverse gear, the PCM will command additional line pressure in order to maintain correct reverse gear ratio. The amount of additional pressure is determined by the PCM and is used to increase the base line pressure. The larger the value, the greater the increase to line pressure.
TCC Brake Switch: The torque converter clutch (TCC) brake switch parameter displays Open/Closed. When the brake pedal is applied, the TCC brake switch sends a signal to the PCM to disengage the TCC and disable cruise control.
TCC Duty Cycle: The torque converter clutch (TCC) duty cycle parameter indicates the commanded percent of the TCC PWM solenoid valve On time. A value of 20 percent represents an energized commanded state and a value of 0 percent represents a de-energized commanded state. The commanded state is applied at vehicle speeds that are above approximately 16 km/h (10 mph).
TCC Duty Cycle Open/Short to GND: The torque converter clutch (TCC) duty cycle open/short to ground parameter indicates whether an open or a short to ground exists in the TCC PWM solenoid valve feedback signal to the PCM and displays Yes or No. The TCC PWM solenoid valve must be commanded Off for this parameter to be valid. 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 indicates whether a short to battery, B+, exists in the TCC PWM solenoid valve feedback signal to the PCM and displays Yes or No. The TCC PWM solenoid valve must be commanded On for this parameter to be valid. 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 indicates the status of the normally-closed TCC release switch and displays Yes or No. A scan tool displaying Yes indicates the switch is open, TCC release fluid pressure is present and the TCC is released. A scan tool displaying No indicates the switch is closed, TCC release fluid pressure is not present and the TCC is applied.
TCC Slip Speed: The torque converter clutch (TCC) slip speed parameter displays the difference between the transmission input shaft RPM and the engine RPM. A negative value indicates deceleration. A value of near zero indicates that the TCC is applied.
TFT Sensor: The transmission fluid temperature (TFT) sensor parameter displays the voltage drop across the TFT sensor. The PCM applies 5 volts to the TFT sensor circuit. The sensor is a thermistor that 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) parameter displays a percentage that is computed by the PCM from the TP sensor voltage. The TP angle should display 0 percent at idle and 100 percent at wide open throttle (WOT).
TP Sensor: The throttle position (TP) sensor parameter indicates the voltage being monitored by the PCM on the TP sensor signal circuit.
Traction Control: This parameter displays Active or Inactive. The scan tool displays Active when the PCM receives a request for torque reduction from the electronic brake traction control module (EBTCM).
Trans. Fluid Temp.: The transmission fluid temperature parameter displays the temperature conversion of the voltage input signal to the PCM from the transmission fluid temperature (TFT) sensor. When the TFT is high, 151°C (304°F), the signal voltage is low, 0 volts. When the TFT is low, -40°C (-40°F), the signal voltage is high, 5 volts.
Transmission Hot Mode: This parameter indicates 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 more that 5 seconds. Note: these numbers are approximate. They differ with transmissions.
Transmission ISS: The transmission input shaft speed parameter displays the rotational speed of the transmission input shaft as expressed in revolutions per minute.
Transmission OSS: The transmission output shaft speed parameter displays the rotational speed of the transmission output shaft as expressed in revolutions per minute.
Vehicle Speed: This parameter is the vehicle speed sensor (VSS) input signal converted by the PCM to be displayed as vehicle speed in both metric and English units.
