Scan Tool Data Definitions. Chevrolet Brazil Blazer 1997

For 1990-2009 cars

### Transmission Scan Tool Data Definitions

1-2 Shift Error: Displays a range of -6.38 to +6.38 seconds. This parameter is the difference between the desired 1-2 shift time and the actual 1-2 shift time. This value is only accurate if the Adaptable Shift parameter indicates Yes.
1-2 Shift Time: Displays a range of 0.00-6.38 seconds. This parameter is the actual time of the last 1-2 shift. The shift time is based on the engine RPM drop after the commanded 1-2 shift. This value is only accurate if the Adaptable Shift parameter indicates Yes.
1-2 Sol.: Displays On or Off. This parameter is the commanded state of the 1-2 shift solenoid valve. On represents a commanded energized state (current is flowing through the solenoid). Off represents a non-commanded state (current is not flowing through the solenoid).
1-2 Sol. Open: Displays Yes or No. This parameter indicates if an open or short to ground exists in the 1-2 shift solenoid valve feedback signal to the VCM. The 1-2 SS Valve must be commanded Off for this parameter to be valid.
1-2 Sol. Shorted: Displays Yes or No. This parameter indicates if a short to B+ exists in the 1-2 shift solenoid valve feedback signal to the VCM. The 1-2 SS Valve must be commanded On for this parameter to be valid.
2-3 Shift Error: Displays a range of -6.38 to +6.38 seconds. This parameter is the difference between the desired 2-3 shift time and the actual 2-3 shift time. This value is only accurate if the Adaptable Shift parameter indicates Yes.
2-3 Shift Time: Displays a range of 0.00-6.38 seconds. This parameter is the actual time of the last 2-3 shift. The shift time is based on the engine RPM drop after the commanded 2-3 shift. This value is only accurate if the Adaptable Shift parameter indicates Yes.
2-3 Sol.: Displays On or Off. This parameter is the commanded state of the 2-3 shift solenoid valve. On represents a commanded energized state (current is flowing through the solenoid). Off represents a non-commanded state (current is not flowing through the solenoid).
2-3 Sol. Open: Displays Yes or No. This parameter indicates if an open or short to ground exists in the 2-3 shift solenoid valve feedback signal to the VCM. The 2-3 SS Valve must be commanded Off for this parameter to be valid.
2-3 Sol. Shorted: Displays Yes or No. This parameter indicates if a short to B+ exists in the 2-3 shift solenoid valve feedback signal to the VCM. The 2-3 SS Valve must be commanded On for this parameter to be valid.
3-2 Downshift Sol.: Displays Yes or No. This parameter indicates if the 3-2 shift solenoid valve assembly is currently commanded On or Off. Yes indicates that the 3-2 shift solenoid valve assembly is On. No indicates that the 3-2 shift solenoid valve assembly is Off. The solenoid commanded state is based on the transmission temperature. The solenoid will change states during a 3-2 downshift to regulate the appropriate pressure. The commanded state of the solenoid occurs at approximately 30 mph with a throttle increase.
3-4 Shift Error: Displays a range of -6.38 to +6.38 seconds. This parameter is the difference between the desired 3-4 shift time and the actual 3-4 shift time. This value is only accurate if the Adaptable Shift parameter indicates Yes.
3-4 Shift Time: Displays a range of 0.00-6.38 seconds. This parameter is the actual time of the last 3-4 shift. The shift time is based on the engine RPM drop after the commanded 3-4 shift. This value is only accurate if the Adaptable Shift parameter indicates Yes.
4WD: Displays Yes or No. This parameter indicates whether the vehicle is currently in a four-wheel drive mode.
4WD Low: Displays Yes or No. This parameter is the signal state of the four-wheel drive low circuit. Yes indicates a 0 voltage signal (4WD Low requested). No indicates a B+ voltage signal (4WD Low not requested). If 4WD low is requested, the transmission output speed increases by a factor of the transfer case ratio.
A/C Clutch: Displays Yes or No. This parameter indicates the commanded state of the A/C control relay. The clutch should be engaged when Yes displays.
Adaptable Shift: Displays Yes or No. Yes indicates that the proper operating conditions were all within the proper operating range during the last shift and that the shift time was accurate. This shift information is then used through the adaptive function in order to update the adapt cells. No indicates that not all of the operating conditions were met in order to enable this function and that the adapt cells were not updated. Proper operating conditions include TP Sensor Delta, Engine Torque, Vehicle Speed Delta, Engine Vacuum and Shift Delay.
BARO: Displays a range of 10-104 kPa, 0.00-5.00 V. The BARO Sensor measures barometric pressure during the ignition ON cycle and during Wide Open Throttle (WOT). This allows the VCM to make fuel delivery, spark timing, and transmission line pressure adjustments for changing altitudes.
Brake Switch: Displays Open or Closed. This parameter indicates the state of the brake switch circuit input. Open indicates a zero voltage input (brake switch open, brake pedal applied). Closed indicates a B+ voltage input (brake switch closed, brake pedal released).
Cruise Enabled: Displays Yes or No. This parameter indicates whether the VCM is allowing cruise operation. The VCM has the ability to disable cruise control under certain conditions.
Current DTC Set: Displays Yes or No. This parameter displays Yes if a DTC is active during the current ignition cycle.
Current Gear: Displays 1, 2, 3 or 4. This parameter indicates the current commanded state of the shift solenoids.
Current TAP (Transmission Adaptive Pressure): Displays a TP cell range of 0-16. This parameter indicates the current throttle position cell used for line pressure modification (adaptation).
Desired Idle: Displays 0-3187 RPM. This parameter indicates the idle speed that is commanded by the VCM. The VCM will compensate for various engine loads based on the engine coolant temperature in order to keep the engine at the desired speed.
ECT (Engine Coolant Temperature): Displays a range of -40°C to 151°C (-40°F to 304°F). This parameter is the input signal of 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°) when the signal voltage is high (5 V).
ECT Sensor: Displays 0.00-4.98 V. When the sensor is cold (internal resistance is high), the VCM monitors a high signal voltage which the VCM interprets as a cold engine. As the sensor warms (internal resistance decreases), the voltage signal decreases and the VCM interprets the lower voltage as a warm engine.
End of Shift: Displays Yes or No. This parameter indicates when an upshift has been completed. Yes is displayed briefly when an upshift has been completed. No indicates that an upshift has not just been completed.
Engine Run Time: Displays a range of 0:00:00-18:12:15 hr/min/sec. This parameter measures how long the engine has been operating. When the ignition switch is turned OFF, the value is reset to zero.
Engine Speed: Displays a range of 0-8192 RPM. This parameter indicates the rotational speed of the engine expressed as revolutions per minute.
Hot Mode: Displays Yes or No. This parameter monitors transmission temperature. No indicates that the transmission temperature has not exceeded 127°C (261°F). Yes indicates that the transmission temperature has exceeded 135°C (275°F).
Ignition 1: Displays a range of 0.0-25.5 V. This represents the system voltage measured by the VCM at it's ignition feed.
Kickdown Enabled: Displays Yes or No. This parameter indicates whether enabling conditions exist for an acceleration mode downshift. No indicates that enabling conditions such as throttle position, vehicle speed, or input speed do not exist for an acceleration mode downshift. Yes indicates that enabling conditions exist for an acceleration mode downshift.
Long Shift Delay: Displays Yes or No. This parameter indicates whether a long shift delay occurred during the last shift. Yes indicates that a long shift delay occurred. No indicates that a long shift delay did not occur. A shift delay is determined from the time that the VCM commands the shift until the start of the engine RPM drop. When a shift delay is within a range that enables shift adapts, No is indicated.
Long Shift Time: Displays Yes or No. This parameter indicates whether a long shift time occurred during the last shift. Yes indicates that a long shift time occurred. No indicates that a long shift time did not occur. Shift time is calculated from the beginning of the engine RPM drop to the beginning of the engine RPM increase. When shift time is within a range that enables shift adapts, No is indicated.
MAP (Manifold Absolute Pressure): Displays a range of 10-104 kPa, 0.00-5.00 V. The MAP sensor, which is attached to the intake manifold, measures changes in intake manifold pressure. These changes result from engine speed and load changes. The VCM uses this information to adjust fuel delivery and spark plug timing according to incoming air density.
Maximum TAP (Transmission Adaptive Pressure): Displays Yes or No. This parameter indicates when line pressure modification (adaptation) has reached its limit. Yes indicates that the limit has been reached. No indicates that the limit has not been reached.
PC Act. (Actual) Current: Displays a range of 0.00-1.10 amps. This parameter is the actual current of the pressure control solenoid circuit at the control module. Zero amp (no current flow) indicates actual higher line pressure. Actual lower line pressure is indicated by 1.1 amps (high current flow).
PC Duty Cycle: Displays a range of 0-100%. This parameter is the commanded state of the pressure control solenoid expressed as a percent of energized On time. Zero percent indicates zero On time (non-energized) or no current flow. Approximately 60% at idle indicates maximum On time (energized) or high current flow.
PC Ref. (Reference) Current: Displays a range of 0.00-1.10 amps. This parameter is the commanded current of the pressure control solenoid circuit. Zero amp (no current flow) indicates commanded higher line pressure. Commanded lower line pressure is indicated by 1.1 amps (high current flow).
PC Sol. Low Volts: Displays Normal or Low Volts. This parameter indicates system voltage conditions to the VCM. This parameter is based on transmission temperature. A parameter of Normal indicates that the voltage to the VCM is within a range that allows the PC Sol. Valve to function properly. Low Volts indicates that the voltage to the VCM is low, and the PC Sol. Valve has turned off.
Power Enrichment: Displays Yes or No. This parameter indicates when the power enrichment mode is active (moderate to heavy acceleration). Yes indicates that the power enrichment mode is active. No indicates that the power enrichment mode is not active.
Shift Completed: Displays Yes or No. This parameter indicates when a shift has been completed. Yes indicates that a shift has been completed, and this parameter will be displayed until the next shift occurs. No indicates that a shift has not been completed, and this parameter will be displayed during a shift.
Shift Delay: Displays a range of 0.00-6.38 seconds. This parameter indicates the time between when the VCM commands the shift to the start of the drop in engine RPM.
Speed Ratio: Displays a range of 0.00:1-8.00:1. This parameter indicates engine speed divided by transmission output speed. This value is used to estimate transmission gear ratio.
Start of Shift: Displays Yes or No. This parameter indicates when an upshift has been detected. Yes is displayed briefly when an upshift has been detected. No indicates that an upshift has not been detected.
TCC Delta TP: Displays Yes or No. This parameter indicates when the TP value is within a TP Delta range that allows the TCC to apply. A TP Delta range is the amount that the TP moves during the shift calculation. A parameter of Yes indicates that the TP value changed too quickly. This will prevent the TCC from applying. No indicates that the TP value is within the range needed for the TCC to apply.
TCC Duty Cycle: Displays a range of 0-100%. This parameter is the commanded percentage of ON time of the TCC PWM solenoid. Approximately 90% represents an ON (energized) commanded state. Zero percent represents an OFF (non-energized) commanded state. This commanded state is applied at a vehicle speed between approximately 0-16 km/h (0-10 mph).
TCC Duty Open: Displays Yes or No. This parameter indicates whether an open or a short to ground exists in the TCC PWM solenoid valve feedback signal to the VCM. The TCC PWM solenoid valve must be commanded Off for this parameter to be valid.
TCC Duty Shorted: Displays Yes or No. This parameter indicates whether a short to B+ exists in the TCC PWM solenoid valve feedback signal to the VCM. The TCC PWM solenoid valve must be commanded On for this parameter to be valid.
TCC Enable: Displays Yes or No. This parameter is the commanded state of the TCC solenoid. Yes indicates a commanded energized state (current is flowing through the solenoid). No indicates a commanded non-energized state (current is not flowing through the solenoid). This commanded state occurs at various vehicle speeds between applications.
TCC Enable Open: Displays Yes or No. This parameter indicates whether an open or a short to ground exists in the TCC solenoid valve feedback signal to the VCM. The TCC PWM solenoid valve must be commanded Off for this parameter to be valid.
TCC Enable Short: Displays Yes or No. This parameter indicates whether a short to B+ exists in the TCC solenoid valve feedback signal to the VCM. The TCC PWM solenoid valve must be commanded On for this parameter to be valid.
TCC Min. TP: Displays Yes or No. This parameter indicates whether or not the TP has achieved the minimum value needed in order to allow the TCC to apply. Yes indicates that the minimum TP value has not been achieved. No indicates that the minimum TP value has been achieved.
TCC Out of Range: Displays Yes or No. This parameter indicates whether or not the transmission is in a range which allows the TCC to apply. Yes indicates that the transmission is not in a range which allow the TCC to apply. No indicates that the transmission is in a valid range.
TCC (Torque Converter Clutch) Slip Speed: Displays a range of -4080 to 4079 RPM. This parameter is the difference between transmission output speed and engine speed. A negative value indicates that the engine speed is less than the output speed (deceleration). A positive value indicates that the engine speed is greater than the output speed (acceleration). A value of zero indicates that the engine speed is equal to the output speed (TCC applied).
TFT (Automatic Transmission Fluid Temperature): Displays a range of -40°C to 151°C (-40°F to 304°F). This parameter is the input signal of the transmission fluid temperature sensor. Transmission fluid temperature is high (151°C) when signal voltage is low (0 V), and transmission fluid temperature is low (-40°) when signal voltage is high (5 V).
TFT (Transmission Fluid Temperature) Sensor: Displays a range of 0.00-5.00 V. When the transmission fluid is cold, the sensor resistance is high and the VCM will sense high signal voltage. As the transmission fluid temperature warms to a normal operating temperature, the sensor resistance becomes less and the voltage decreases.
TFP Switch A/B/C: Displays On/Off, On/Off, On/Off. These parameters are the three inputs from the Automatic Transmission Fluid Pressure Manual Valve Position Switch Assembly. On represents a 0 voltage signal. Off represents a B+ voltage signal.
TP (Throttle Position) Angle: Displays a range of 0-100%. The TP angle is computed by the VCM from the TP sensor voltage. The TP angle should read 0% at idle and 100% at Wide Open Throttle (WOT).
TP Delta: Displays Yes or No. This parameter indicates when the TP is within a TP delta range that enables shift adapts. A TP delta range is how much the TP is moved during the shift calculation. Yes indicates that the TP is within the range. No indicates that the TP is not within the range.
TP Range: Displays Yes or No. This parameter indicates when the throttle position is within a range that enables shift adapts. Yes indicates that the TP is within the range. No indicates that the TP is not within the range.
TP (Throttle Position) Sensor: Displays a range of 0.00-5.00 V. The TP sensor is used by the VCM to determine the amount of throttle demanded by the driver. Voltage is below 1 volt at idle and above 4 volts at Wide Open Throttle (WOT).
Trans. Range: Displays a range of Error, Reverse, Overdrive, Drive3, Drive2, Low1 or Park/Neutral. These parameters are the decoded status of the three A/B/C range inputs from the Automatic Transmission Fluid Pressure Manual Valve Position Switch Assembly. These parameters represent the position of the transmission manual valve.
Trans. OSS (Output Speed Sensor): Displays a range of 0-8192 RPM. This parameter indicates the rotational speed of the transmission output shaft expressed as revolutions per minute.
Upshift: Displays Yes or No. This parameter indicates when the VCM desires an upshift. Yes indicates an upshift is desired. No indicates an upshift is not desired.
Vehicle Speed: Displays a range of 0-255 km/h (0-158 mph). This parameter is the input signal from the vehicle speed sensor assembly.
VSS Delta: Displays Yes or No. This parameter indicates when the VSS is within a range that enables shift adapts. Yes indicates that the VSS is within the range. No indicates that the VSS is not within the range.