Scan Tool Data Definitions

1-2 Shift Error: The scan tool displays -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, negative number equals a longer shift time.

1-2 Shift Time: The scan tool displays 0.00 to 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.

2-3 Shift Error: The scan tool displays -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, negative number equals a longer shift time.

2-3 Shift Time: The scan tool displays 0.00 to 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.

3-4 Shift Error: The scan tool displays -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, negative number equals a longer shift time.

3-4 Shift Time: The scan tool displays 0.00 to 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.

1-2 Sol (Solenoid) 2-3 Sol (Solenoid): Scan tool displays On or Off. These parameters are the commanded states of the 1-2 and the 2-3 Shift Solenoid Valves. On indicates a commanded energized solenoid state, and Off indicates a commanded non-energized solenoid state.

1-2 Sol (Solenoid) Open: 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 Powertrain Control Moduel (PCM). The 1-2 Shift Solenoid Valve must be commanded Off for this parameter to work.

1-2 Sol (Solenoid) Shorted: 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 work.

2-3 Sol (Solenoid) Open: 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 work.

2-3 Sol (Solenoid) Shorted: 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 work.

A/C Clutch: 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.

Cruise Enable: Scan tool displays On or Off. When the display indicates On, the PCM is allowing cruise control operation. When the display indicates Off, 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: 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.

ECT (Engine Coolant Temperature): Scan tool range: -40 to 151° C (-40 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: Scan tool displays 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: 0-9999 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 Nm. 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: Scan tool displays Yes or No. This display indicates the Automatic Transmission Fluid Temperature (TFT). No indicates that the TFT has not exceeded 130° C (266° F). Yes 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 Volts: Scan tool range: 0.0-25.5V. This parameter is the system voltage measured by the PCM at the PCM ignition input, when the ignition switch is in the RUN position.

Intake Air Temperature (IAT): Scan tool range: -40 to +215° C (-40 to +419° 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: The scan tool displays 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 Sol. (Pressure Control Solenoid Valve) 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 Valve) 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 Active or Inactive. This parameter indicates the state of the performance control program. The scan tool displays Inactive when the performance mode is not active. The scan tool displays Active when the performance mode is active.

TCC (Torque Converter Clutch) 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.

TCC Duty Cycle: Scan tool range: 0-100%. This display indicates the commanded percent of the TCC PWM Sol. Valve On time. 90% represents an energized commanded state and 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 Duty Cycle Open: 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 work. The Scan tool will display Yes only while the TCC PWM Sol. Valve is Off. The display will pulsate.

TCC Duty Cycle Shorted: 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 work. The Scan tool will display Yes only while the TCC PWM Sol. Valve is On. The display will pulsate.

TCC (Torque Converter Clutch) Release Pres. (Pressure): The scan tool displays On or Off. This parameter is the status of the normally-closed TCC Release Switch. A scan tool displaying On indicates the switch is closed, TCC release fluid pressure is present, and the TCC is released. A scan tool displaying Off 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 Switch 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.

TFT (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).

Trans. ISS (Transmission Input (Shaft) Speed Sensor: Scan tool range: 0-8191 RPM. This parameter is the rotational speed of the transmission input shaft.

Trans (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 (km/h, mph): 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.