1-2 Shift Error: Scan tool range: -3.20 to +3.18 seconds. This parameter
is the difference between the desired 1-2 shift time and the actual 1-2 shift
time. A larger number equals a longer shift time.
1-2 Shift Time: Scan tool range: 0.00-6.38 seconds. 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. (Solenoid): The scan tool displays On or Off. This parameter is 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 (Solenoid) Open: The scan tool displays Yes or No. This parameter indicates whether an
open or a 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 be valid.
1-2 Sol (Solenoid) Shorted: The scan tool displays Yes or No. This parameter indicates whether a
short to battery (B+) 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 be valid.
2-3 Shift Error: Scan tool range: -3.20 to +3.18 seconds. This parameter
is the difference between the desired 2-3 shift time and the actual 2-3 shift
time. A larger number equals a longer shift time.
2-3 Shift Time: Scan tool range: 0.00-6.38 seconds. 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. (Solenoid): The scan tool displays On or Off. This parameter is 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 (Solenoid) Open: The scan tool displays Yes or No. This parameter indicates whether an
open or a 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 be valid.
2-3 Sol (Solenoid) Shorted: The scan tool displays Yes or No. This parameter indicates whether a
short to battery (B+) 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 be valid.
3-4 Shift Error: Scan tool range: -3.20 to +3.18 seconds. This parameter
is the difference between the desired 3-4 shift time and the actual 3-4 shift
time. A larger number equals a longer shift time.
3-4 Shift Time: Scan tool range: 0.00-6.38 seconds. 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.
A/C Clutch: The scan tool displays On or Off. This represents the PCM commanded state
of the A/C compressor clutch relay driver circuit. 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.
Adaptable Shift: The scan tool displays Yes or No. When the transmission's adapt capability
is functional, the scan tool displays Yes during the shift calculation and
until the commanded gear changes. When the transmission's adapt capability
is not functional, the scan tool displays No.
Brake Switch: Scan tool range: 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.
Cruise: The scan tool 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 for 4-3 and
3-2 downshifts.
Commanded Gear: The scan tool displays 1, 2, 3, or 4. The PCM looks at the transmission
range position and the gear commanded by the PCM. The actual forward gear
that the transmission is in will be the lower of the two because the manual
valve overrides the PCM commanded gear.
Current TAP (Transmission Adaptive Pressure) Cell: Scan tool range: 0-16. This parameter indicates the current TP
cell used for line pressure modification (adapt).
Current TAP (Transmission Adaptive Pressure) Memory: Scan tool range: -110 to +110 kPa (-16 to +16 psi).
This parameter is the amount of pressure which must be added to base line
pressure in order to adjust the apply effort of a clutch or a band during
a shift.
ECT (Engine Coolant Temperature): Scan tool range: -40°C to 151°C (-40°F to 304°F).
The 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 which 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: The scan tool displays Hours/Minutes/Seconds. This parameter indicates
the time elapsed since the engine was started. If the engine is stopped, this
parameter is reset to 00:00:00.
Engine Speed (RPM): Scan tool range: 0-8192 RPM. The engine speed is computed
by the PCM from the fuel control reference input (the crankshaft position
sensor). This parameter indicates the rotational speed of the engine expressed
as revolutions per minute.
Engine Torque: Scan tool range: 0-510 N·m (0-376 lb ft.
This parameter is the torque delivered by the engine.
Gear Ratio: Scan tool range: 0.00-3.98. This display is the actual transmission
gear ratio as the transmission operates through all Drive, Reverse and Park/Neutral
ranges.
Hot Mode: The scan tool displays On or Off. This display indicates the Automatic
Transmission Fluid Temperature (TFT). 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.
Ignition Voltage: Scan tool range: 0.0-25.5 V. This parameter is the system
voltage measured by the PCM at the PCM ignition input, when the ignition switch
is in the RUN position.
IAT (Intake Air Temperature): Scan tool range: -40 to +151°C (-40 to +304°F). Changes
in air temperature at the intake manifold cause a change in voltage across
the IAT Sensor. The PCM translates the voltage into air temperature. The PCM
uses IAT Sensor information to adjust the fuel delivery, the ignition timing,
the line pressure, and the shift timing.
Last Shift Time: Scan tool range: 0.00-6.38 seconds. This parameter is the
actual shift time of the last upshift.
PC Sol. (Pressure Control Solenoid Valve) Actual Current: Scan tool range: 0.0-1.25 amps. This parameter is the actual
current flow through the PC Sol. Valve circuit, as measured by the PCM. Low
current flow indicates high line pressure. High current flow indicates low
line pressure.
PC (Pressure Control) Solenoid Duty Cycle: Scan tool range: 0-100%. This parameter indicates the commanded
state of the PC Sol. Valve circuit, expressed as a percentage of ON time (energized).
0% duty cycle indicates no current flow (zero ON time). High current flow
is approximately 60% duty cycle, at idle.
PC Sol. (Pressure Control Solenoid) Ref. (Reference) Current: Scan tool range: 0.0-1.25 amps. This parameter is the current
flow commanded by the PCM through the PC Sol. Valve circuit. Low current flow
indicates high line pressure. High current flow indicates low line pressure.
Shift Mode: The scan tool displays Performance or Normal. This parameter indicates
the state of the performance control program. The scan tool displays Normal
when the performance mode is not active. The scan tool displays Performance
when the performance mode is active.
TAP % of TP (Transmission Adapt Pressure percent of Throttle Position): Scan tool range: -110 to +110 kPa (-16 to +16 psi)
TCC (Torque Converter Clutch) Duty Cycle: Scan tool range: 0-100%. This display indicates the commanded percent
of the TCC PWM Sol. Valve On time. A value of 20% represents an energized
commanded state and a value of 0% represents a de-energized commanded state.
the commanded state is applied at vehicle speeds that are above approximately
16 km/h (10 mph).
TCC (Torque Converter Clutch) Duty Cycle Open: The scan tool displays Yes or No. This parameter indicates whether an
open or a short to ground exists in the TCC PWM Sol. Valve feedback signal
to the PCM. The TCC PWM Sol. Valve must be commanded Off for this parameter
to be valid. The Scan tool will display Yes only while the TCC PWM Sol. Valve
is Off. The display will pulsate.
TCC (Torque Converter Clutch) Duty Cycle Short: The scan tool displays Yes or No. This parameter indicates whether a
short to battery (B+) exists in the TCC PWM Sol. Valve feedback signal to
the PCM. The TCC PWM Sol. Valve must be commanded On for this parameter to
be valid. The Scan tool will display Yes only while the TCC PWM Sol. Valve
is On. The display will pulsate.
TCC (Torque Converter Clutch) Release Pressure: The scan tool displays Yes or No. This parameter is the status of the
normally-closed TCC Release Switch. A scan tool displaying Yes indicates the
switch is closed, TCC release fluid pressure is present, and the TCC is released.
A scan tool displaying No indicates the switch is open, TCC release fluid
pressure is not present, and the TCC is applied.
TCC (Torque Converter Clutch) Slip Speed: Scan tool range: -4080 to +4079 RPM. This display is the
difference between the transmission output shaft RPM and the engine RPM. A
negative value indicates deceleration: the engine RPM is less than the output
shaft RPM. A positive value indicates acceleration: the engine RPM is more
than the output shaft RPM. A value of zero indicates that TCC is applied:
the engine RPM is equal to the output shaft RPM.
TFP Automatic Transmission Fluid Pressure Manual Valve Position Sw.
A/B/C: The scan tool displays On or Off, On or Off, On or Off. The parameters
are the three inputs for Range A/B/C from the Automatic Transmission Fluid
Pressure Manual Valve Position Switch (TFP Val. Position Sw.). On represents
a low voltage signal, indicating that the switch is closed. Off represents
a high voltage signal, indicating that the switch is open. The PCM uses the
input sequence in order to determine the actual manual valve position. The
PCM uses the actual manual valve position in order to control the line pressure,
the TCC, and the shift solenoid valves.
Trans. Fluid Temp. (Automatic Transmission Fluid Temperature): Scan tool range: -40 to +151°C (-40 to +304°F).
This display is the temperature conversion of the voltage input signal to
the PCM of the TFT. When the TFT is high (151°C, 304°F), the signal
voltage is low (0.00 volts). When the TFT is low (-40°C, -40°F),
the signal voltage is high (5.00 volts).
TFT (Automatic Transmission Fluid Temperature) Sensor: Scan tool range: 0.00-5.00 volts. This display shows the
voltage drop across the TFT sensor. 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 (Throttle Position) Sensor: Scan tool range: 0.00-5.00 volts. This parameter indicates
the voltage being monitored by the PCM on the TP sensor signal circuit.
TP (Throttle Position) Angle: Scan tool range: 0-100%. The TP Angle is computed by the PCM from
the TP sensor voltage. The TP Angle should display 0% at idle and 100% at
Wide Open Throttle (WOT).
Traction Control: The scan tool 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).
Transmission ISS (Input Speed Sensor): Scan tool range: 0-8191 RPM. This parameter is the rotational
speed of the transmission input shaft.
Transmission OSS (Output Speed Sensor): Scan tool range: 0-8191 RPM. This display indicates the
rotational speed of the transmission output shaft as expressed in revolutions
per minute.
Vehicle Speed: Scan tool range: 0-255 km/h (0-158 mph). This parameter
is the Vehicle Speed Sensor (VSS) input signal converted by the PCM to be
displayed in both metric and English units.