This list explains each data message displayed on the scan
tool.
This information will assist you in tracking down emissions or driveability
DTCs, because you can view the displays while you are driving the vehicle.
Refer to the On-Board Diagnostic System Check for additional information.
1-2 Shift Error: Range: -3.20 to +3.18 seconds. This display 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: 0.00-6.38 seconds. This display is the actual
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) 2-3 Sol (Solenoid): Displays On or Off. When the transmission is in first and fourth
gear, the display should indicate ON for the 1-2 solenoid. When the transmission
is in second and third gear, the display should indicate OFF for the 1-2
solenoid. When the transmission is in first and second gear, the display
should indicate OFF for the 2-3 solenoid. When the transmission is in third
and fourth gear, the display should indicate ON for the 2-3 solenoid.
1-2 TAP High Cell (1-2 Shift Transmission Adapt Pressure High Cell): Range: -221 to +214 kPa (-32 to +31 psi).
This display is the amount of pressure that is added to the base line pressure
in order to adjust the holding effort of a clutch or a band during a 1-2
shift with high shift torque.
1-2 TAP Low Cell (1-2 Shift Transmission Adapt Pressure Low Cell): Range: -221 to +214 kPa (-32 to +31 psi).
This display is the amount of pressure that is added to the base line pressure
in order to adjust the holding effort of a clutch or a band during a 1-2
shift with low shift torque.
1-2 WOT Desired (1-2 Wide Open Throttle Desired): Range: 0-6553 RPM. This display indicates the desired
maximum engine speed obtained during a 1-2 upshift at wide open throttle.
1-2 WOT TAP (1-2 Wide Open Throttle Transmission Adapt Pressure): Range: -26 to +24 km/h (-16 to +15 mph).
This display indicates a speed offset which is used to modify the wide open
throttle 1-2 shift point to achieve the desired 1-2 wide open throttle RPM.
2-1 Shift Time: Range: 0.00-6.38 seconds. This display is the actual
time of the last 2-1 shift. The shift time is based on a gear box ratio change
after the commanded 2-1 downshift.
2-3 Shift Error: Range: -3.20 to +3.18 seconds. This display 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 display is the actual
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 TAP High Cell (2-3 Shift Transmission Adapt Pressure High Cell): Range: -221 to +214 kPa (-32 to +31 psi).
This display is the amount of pressure that is added to the base line pressure
in order to adjust the holding effort of a clutch or a band during a 2-3
shift with high shift torque.
2-3 TAP Low Cell (2-3 Shift Transmission Adapt Pressure Low Cell): Range: -221 to +214 kPa (-32 to +31 psi).
This display is the amount of pressure that is added to the base line pressure
in order to adjust the holding effort of a clutch or a band during a 2-3
shift with low shift torque.
3-2 Shift Time: Range: 0.00-6.38 seconds. This display is the actual
time of the last 3-2 shift. The shift time is based on a gear box ratio change
after the commanded 3-2 downshift.
3-4 Shift Error: Range: -3.20 to +3.18 seconds. This display 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: Range: 0.00-6.38 seconds. This display is the actual
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 High Cell (3-4 Shift Transmission Adapt Pressure High Cell): Range: -221 to +214 kPa (-32 to +31 psi).
This display is the amount of pressure that is added to the base line pressure
in order to adjust the holding effort of a clutch or a band during a 3-4
shift with high shift torque.
3-4 TAP Low Cell (3-4 Shift Transmission Adapt Pressure Low Cell): Range: -221 to +214 kPa (-32 to +31 psi).
This display is the amount of pressure that is added to the base line pressure
in order to adjust the holding effort of a clutch or a band during a 3-4
shift with low shift torque.
4-3 Shift Time: Range: 0.00-6.38 seconds. This display is the actual
time of the last 4-3 shift. The shift time is based on a gear box ratio change
after the commanded 4-3 downshift.
A/C Relay: Displays On or Off. This represents the commanded state of the
A/C clutch control relay. The clutch should be engaged whenever ON is displayed.
The PCM will compensate for the additional engine load that is accompanied
with the A/C clutch engaged.
Adaptable Shift: Displays Yes or No. This display is the monitor of the upshift
adapt function. When the adapt capability is functional, Yes will be displayed
during shift calculation and until the commanded gear changes. When the
adapt function is not functional, No will be displayed.
A/T Performance Mode: Displays Performance or Normal. This display shows the actual state
of the performance control program within the PCM. The display indicates NORMAL
when the performance mode is not active (normal shift pattern). The display
indicates PERFORMANCE when the performance mode is active (performance shift
pattern).
Barometric Pressure Sensor (BARO): Range: 10-104 kPa, 0.0-5.0 V. The MAP
sensor is used to measure barometric pressure when the ignition is turned
to the run position and during Wide Open Throttle (WOT). The PCM will make
adjustments for fuel delivery, ignition timing, line pressure and shift
times for changes in altitudes.
Commanded TCC: Range: 0-1758 kPa (0-255 psi). This display
indicates a desired output pressure from the TCC PWM solenoid. This pressure
is calculated from the TCC PWM solenoid duty cycle.
Cruise: Displays Disabled or Enabled. When the display indicates Enabled,
the PCM is allowing cruise control operation. When the display indicates Disabled,
the PCM has disabled cruise control operation. When the cruise control display
is Enabled, shift patterns will be altered for 2-3 and 3-4 upshifts or 4-3
and 3-2 downshifts.
Current Gear: Displays: 1,2,3, or 4. This display indicates the current commanded
state of the shift solenoids.
Current Trans. DTC Set: Range: 0-255. This display will show the number of active
Diagnostic Trouble Codes (DTCs) which are stored in Freeze Frame and Failure
Record.
Downshift In Progress: Displays Yes or No. This display indicates when the transmission
is currently in a downshift. Yes indicates a downshift is in progress. No
indicates a downshift is not in progress.
ECT (Engine Coolant Temperature): 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 engine coolant temperature.
ECT Sensor (Engine Coolant Temperature Sensor): Range: 0.0-5.0 V. This display shows the actual voltage
drop across the PCM's internal resistors and the Engine Coolant Temperature
Sensor. The Engine coolant temperature is high (151°C) when the signal
voltage is low (0 V) and the engine coolant temperature is low (-40°C)
when the signal voltage is high (5.0 V).
Engine Load: Range: 0-100%. The engine load is calculated by the PCM from
the engine speed and mass airflow. The engine load should increase with an
increase in engine RPM and airflow.
Engine Run Time: Displays Hours/Minutes/Seconds. This display will show how long
the engine has been running. When the ignition is turned OFF, the timer is
reset to zero.
Engine Speed (RPM): Range: 0-9999 RPM. Engine speed is computed by the
PCM from the fuel control reference input (crankshaft position sensor). This
parameter indicates the rotational speed of the engine expressed as revolutions
per minute.
Engine Torque: Range: 0-510 N·m (0-406 lb ft.).
This display indicates the amount of torque that is delivered from the engine.
Gear Box Torque: Range: 0-510 N·m (0-406 lb ft.).
This display indicates the amount of torque that is delivered to the transmission
turbine shaft. This value reflects the torque multiplication through the
torque converter.
Gear Ratio: Range: 0.00-4.00. This display is the actual transmission
gear ratio as the transmission operates through all drive ranges including
reverse and Park/Neutral. If the display indicates an unfamiliar gear ratio
in park or neutral, this ratio will be the average ratio for all gears at
the end of the drive cycle.
Hot Mode: Displays Yes or No. This display indicates transmission hot mode
operation due to high transmission fluid temperature. No indicates that the
transmission fluid temperature has not exceeded 130°C (266°F). Yes
indicates that the transmission fluid temperature has exceeded 130°C
(266°F) and has not cooled to 120°C (248°F) for more than five
seconds.
Ignition 0: Range: 0.0-25.5 V. This represents the system voltage
measured by the PCM at its ignition input when the ignition is in the run
position.
Ignition 1: Range: 0.0-25.5 V. This represents the system voltage
measured by the PCM at its ignition input.
Intake Air Temperature (IAT): Range: -40 to +215°C (-40 to +419°F). The changes
in air temperature will cause a change in voltage across the sensor. The PCM
calculates this voltage to air temperature as it enters the intake manifold.
The IAT sensor is used by the PCM to adjust fuel delivery, ignition timing,
line pressure, and shift timing.
Latest Shift: Range: 0.00-6.38 seconds. This display indicates the
actual shift time of the last upshift.
Latest Shift Error: Range: -3.20 to +3.18 seconds. This display is the
difference between the latest desired shift time and the latest actual shift
time. The greater the negative number equals a longer shift.
Manifold Absolute Pressure (MAP): Range: 10-104 kPa, 0.00-5.0 V. The MAP
sensor measures changes in the intake manifold pressure which is a result
from engine RPM and engine load changes. The PCM uses this information to
adjust fuel delivery and ignition timing.
Mass Air Flow (MAF): Range: 0-655 g/s. The PCM converts the mass air flow
sensor input signal into grams per second. This indicates the amount of air
flow entering the intake manifold. The PCM uses this information to adjust
transmission line pressure.
Outside Air Temp: Range: -40 to +101°C (-40 to +214°F). This
is the outside temperature which is sent from the HVAC to the PCM via serial
data.
PC Sol. Actual Current (Pressure Control Solenoid): Range: 0.0-1.25 amps. This display is the actual current
flow through the pressure control solenoid circuit which is monitored by the
PCM. High current results in low line pressure. Low current results in high
line pressure.
PC Sol. Current Error (Pressure Control Solenoid): Range: 0.00-4.98 amps. This display is the difference
between the PC Reference current to the Pressure Control Solenoid and the
PC Actual current through the Pressure Control Solenoid circuit.
PC Solenoid Duty Cycle (Pressure Control): Range: 0-100%. This display indicates the commanded state
of the pressure control solenoid expressed as a percent of ON time (energized).
No current flow indicates zero ON time or 0% duty cycle. High current flow
is approximately 60% duty cycle at idle.
PC Pressure (Pressure Control Pressure): Range: 0-1758 kPa (0-255 psi). This display
is a calculated line pressure that is commanded by the PCM.
PC Sol. Ref. Current (Pressure Control Solenoid Reference Current): Range: 0.0-1.25 amps. This display is the amount of
current which the PCM has commanded through the pressure control solenoid
circuit. High line pressure indicates low current flow. Low line pressure
indicates high current flow.
Power Enrichment: Displays Inactive or Active. This display will show Active when
acceleration is moderate to heavy.
Shift Completed: Displays Yes or No. This display indicates when the transmission
has completed a shift. Yes indicates that the shift is complete. No indicates
that the shift is incomplete.
Shift Delay: Range: 0.00-6.38 seconds. This display indicates the
time delay between the time a shift is commanded and the time the gear box
ratio begins to change.
Shift Pressure: Range: 0-1758 kPa (0-255 psi). This display
is the commanded line pressure value as determined by the PCM.
Shift RPM: Range: 0-6553 RPM. This display indicates the maximum
engine speed obtained during an upshift.
Shift TAP: Range: -441 to +441 kPa (-64 to +64 psi).
This display indicates the amount of pressure added to the base line pressure
to adjust the holding effort of a clutch or a band during a shift.
Shift Time Pres. Error: Range: 883-876 kPa (-128 to +127 psi).
This display indicates a calculated amount of pressure needed to correct the
measured shift time error for the next shift.
Shift Torque: Range: 0-510 N·m (0-406 lb ft.).
This display is the torque value which is used in the commanded pressure calculation
during shift. This display indicates the last shift torque.
Spark: Range: -64 to +64 degrees. This is a display of the
spark advance calculation which the PCM is programming into the ignition system.
The negative numbers indicate degrees after Top Dead Center (TDC) and the
positive numbers indicate degrees of advance before Top Dead Center (BTDC).
The PCM computes the desired spark advance from inputs such as engine temperature,
engine RPM, engine load, vehicle speed, and operating conditions.
Start of Shift: Displays Yes or No. This display indicates when the PCM has commanded
a shift. Yes indicates a commanded shift. No indicates that no shift has been
commanded.
Steady State Mode: Displays: 0, 1, 2, 3, 4, 5, 6, or 7. This display indicates which
steady state adaptive pressure is in use: 0 = Steady State TAP Reverse; 1
= Steady State TAP 1st Gear; 2 = Steady State TAP 2nd Gear; 3 = Steady State
TAP 3rd Gear; 4 = Steady State TAP 4th Gear; 5 = Steady State TAP 2nd Gear/TCC
Applied; 6 = Steady State TAP 3rd Gear/TCC Applied; 7 = Steady State TAP
4th Gear/TCC Applied.
Steady State Slip: Range: 0-255. This is the slip accumulator which increases
or decreases depending on the clutch slip speed and the torque converter clutch
slip speed. This value is used to adapt up or down the steady state adaptive
pressure.
Steady State TAP (Transmission Adapt Pressure): Range: 0-876 kPa (0-127 psi). This display
indicates that the steady state pressure modifier is currently in use.
Steady State TAP 1GR (Transmission Adapt Pressure 1st Gear): Range: 0-876 kPa (0-127 psi). This display
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): Range: 0-876 kPa (0-127 psi). This display
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: Range: 0-876 kPa (0-127 psi). This display
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): Range: 0-876 kPa (0-127 psi). This display
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: Range: 0-876 kPa (0-127 psi). This display
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): Range: 0-876 kPa (0-127 psi). This display
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/TCC: Range: 0-876 kPa (0-127 psi). This display
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: Range: 0-876 kPa (0-127 psi). This display
indicates a pressure modification which is added to the line pressure in Reverse
when the PCM detects a worn or slipping component.
TCC Brake Switch: Displays Applied or Released. This display indicates the status
of the TCC brake switch circuit input to the PCM. APPLIED indicates a zero
voltage input (brake switch open). RELEASED indicates a voltage input (brake
switch closed).
TCC Duty Cycle: Range: 0-100%. This display indicates the commanded percent
of TCC PWM solenoid ON time. 90% represents a fully energized commanded state
and 0% represents a de-energized commanded state.
TCC Enable: Displays Yes or No. This display indicates the commanded state
of the TCC solenoid. Yes indicates that the PCM is commanding the TCC solenoid
to turn on at a calculated duty cycle. No indicates that the PCM is commanding
the TCC solenoid to turn off. The commanded states of ON and OFF occur
under various vehicle speeds and various PCM inputs.
TCC Slip Speed: Range: -4080 to +4079 RPM. This display is the difference
between the engine RPM and the RPM of the input shaft of the transmission.
A negative value indicates that the engine RPM is less than the RPM of
the input shaft (deceleration). A positive value indicates that the engine
RPM is greater than the RPM of the input shaft (acceleration).
TFT (Transmission Fluid Temperature): 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 transmission fluid temperature. Transmission fluid temperature is
high (151°C) when the signal voltage is low (0 V). Transmission
fluid temperature is low (-40°C) when the signal voltage is high
(5.0 V).
TFT Sensor (Transmission Fluid Temperature Sensor): Range: 0.0-5.0 V. This display shows the actual voltage
drop across the PCM's internal resistors and the Transmission Fluid Temperature
Sensor.
Throttle Angle: Range: 0-100%. The Throttle Angle is computed by the PCM
from the TP Sensor voltage. The Throttle Angle should display 0% at idle and
100% at Wide Open Throttle (WOT).
Throttle Angle at Shift: Range: 0-82%. This display is the calculated throttle position
angle from throttle position volts at the time a shift is commanded.
Torque Management Spark: Range: 0-90 degrees. This display indicates that the
PCM is reducing the spark advance in order to reduce engine torque output
for transmission protection.
TP Sensor (Throttle Position Sensor): Range: 0.0-5.0 V, 0-81.92 degrees. The
TP Sensor is used by the PCM to determine the amount of throttle demanded
by the driver. By monitoring the TP voltage and degrees, the PCM will modify
line pressure and shift times.
TFP Sw A/B/C: Displays On or Off, On or Off, On or Off. The displays 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 (switch closed). OFF represents a high voltage signal (switch
open). The sequence of open and closed switches is used by the PCM to determine
actual manual valve position. This input is used for line pressure, TCC,
and shift solenoid control.
Traction Control: Displays Inactive or Active. This display will show Active when
the PCM receives a signal from the Electronic Brake Traction Control Module
(EBTCM) requesting torque reduction during a traction control maneuver.
Traction Control Torque: Range: 0-100%. This is a calculated torque output from the
engine to the transmission which is used by the Electronic Brake Traction
Control Module (EBTCM) for traction control system operation. The PCM will
use this information for line pressure control.
Transmission ISS (Transmission Input Speed Sensor): Range: 0-8191 RPM. This display indicates the rotational
speed of the transmission input shaft expressed as revolutions per minute.
Trans. Oil Life: Range: 0-100%. This display represents the remaining Transmission
Oil Life Index that is calculated and maintained by the PCM.
Transmission OSS (Transmission Output Speed Sensor): Range: 0-8191 RPM. This display indicates the rotational
speed of the transmission output shaft expressed as revolutions per minute.
Upshift: Displays Yes or No. This display indicates when the transmission
is in an upshift. Yes indicates that an upshift is in progress. No indicates
that an upshift is not in progress.
Vehicle Speed: Range: 0-158 mph (0-255 km/h). The vehicle
speed sensor input is converted by the PCM to be displayed in mph and km/h.