Transmission

A list of explanations for each data message displayed on the Tech 1 scan tool begins below.
This information will assist in tracking down emission or driveability problems, since the displays can be viewed while the vehicle is being driven. Refer to the "On-Board Diagnostic System Check" for additional information.

ENGINE SPEED - Scan tool displays 0 RPM to 8191 RPM This parameter indicates the rotational speed of the engine expressed as revolutions per minute.

TRANS OUTPUT SPEED - Scan tool displays 0 RPM to 8191 RPM - This parameter indicates the rotational speed of the transmission output shaft expressed as revolutions per minute.

ENGINE (ENG) COOLANT (COOL) TEMPERATURE (TEMP) - Scan tool 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. Engine coolant temperature is high (151°C) when signal voltage is low (0volt), and engine coolant temperature is low (-40°C) when signal voltage is high (5 volts).

TRANS FLUID TEMP - Scan tool displays a range of - 40°C to 151 °C, 40°F to 304°F This parameter is the signal input of the transmission fluid temperature sensor. Transmission fluid temperature sensor is high (151 °C) when signal voltage is low (0 volt), and transmission fluid temperature is low (-40°C) when signal voltage is high (5 volts).

THROTTLE (THROT) POSITION - Scan tool displays a range of 0.00 volt to 5.10 volts. - This parameter indicates the signal input of the throttle position sensor circuit. Low voltage (approximately 0.3V to 1.3V) indicates closed throttle, high voltage (approximately greater than 4.5V) indicates wide open throttle.

THROTTLE ANGLE - Range of 0-100% - Computed by the PCM from TP sensor voltage (throttle position) and should display 0% at idle and 100% at wide open throttle. Refer to DTC 21 if TP sensor angle is not 0% at idle.

A/B/C RANGE (RNG) - Scan tool displays ON/OFF, ON/OFF, ON/OFF - These parameters are the three inputs from the Transmission Range Pressure Switch Assembly. "ON" represents a B+ voltage signal, "OFF" represents a 0 voltage signal.

TRANS RANGE SWITCH (SW) - Scan tool displays a range of Invalid, Park/Neutral, Reverse, Drive 4, Drive 3, Drive 2, and Low - This parameter is the decoded status of the three A/B/C Range inputs from the Transmission Range Pressure Switch Assembly and represents the position of the transmission manual valve.

COMMANDED GEAR - Scan tool displays a range of 1, 2, 3, or 4 - This parameter is the decoded commanded state of the 1-2 and 2-3 Shift Solenoids. Gear 1 = ON, ON. Gear 2= OFF, ON. Gear 3 = OFF, OFF. Gear 4 = ON, OFF.

ADAPTABLE SHIFT - Scan tool displays NO/YES - This parameter is the current adaptability of the last 1-2 shift. "YES" indicates the last shift time parametric data may be sued to modify fluid line pressure for the next 1-2 shift. "NO" indicates the last 1-2 shift time parametric data may not he used to modify fluid line pressure.

1 - 2 SOLENOID (SOL) / 2-3 SOLENOID (SOL) - Scan tool displays ON/OFF - These parameters are the commanded status of the 1-2 and 2-3 shift solenoids. "ON" represents a commanded energized state (current flowing through solenoid). "OFF" represents a commanded non-energized state (current not flowing through solenoid).

3 - 2 CONTROL SOLENOID (SOL) - Scan tool displays a range of 0% to 100% - This parameter is the commanded percentage of "ON" time of the 3-2 Control Solenoid. "0%" represents a completely "OFF" (non-energized commanded state. "100%" represents an ON" (energized) commanded state.

TRANS HOT MODE - Scan tool displays ON/OFF - "ON" indicates transmission fluid temperature has exceeded 146°C (295°F).

TCC APPLY SOLENOID - Scan tool displays ON/OFF - This parameter is the commanded state of the TCC apply solenoid. "ON" indicates a commanded energized state (current flowing through the solenoid). "OFF" indicates a commanded non-energized state (current not flowing through the solenoid).

TCC PWM SOLENOID - This is the relative position of the pulse width modulated (PWM) solenoid that controls TCC apply pressure. This allows TCC to apply evenly and reduce and harsh engagement.

TCC SLIP SPEED - Scan tool displays a range of -4096 RPM to +4095 RPM - This parameter is the difference between transmission input speed derived (from the engine speed) and transmission output speed (from the vehicle speed sensor). A negative value indicates input speed is less than output speed (deceleration). A positive value indicates input speed is greater than output speed (acceleration). A value of zero indicates input speed is equal to output speed (TCC applied).

DESIRED PRESSURE CONTROL SOLENOID (PCS) - Scan tool displays a range of 0.00 amp to 1.10 amps - This parameter is the commanded current of the Pressure Control Solenoid circuit. 0.00 amps (no current flow) indicates commended higher line pressure. 1.10 amps (high current flow) indicates commanded lower line pressure.

ACTUAL PRESSURE CONTROL SOLENOID (PCS) - Scan tool displays a range of 0.00 amp to 1.10 amps - This parameter is the actual current of the Pressure Control Solenoid circuit at the Control Module. 0.00 amps (no current flow) indicates actual higher line pressure. 1.10 amps (high current flow) indicates actual lower line pressure.

PRESSURE CONTROL SOLENOID (PCS) DUTY CYCLE - Scan tool displays a range of 0% to 100% - This parameter is the commanded state of the pressure control solenoid expressed as a percent of energized of on time. 0% indicates zero on time (non-energized) or on current flow. 100% indicates maximum on time (energized) or high current flow.

MPH / KM/H - Range 0-255 km/h, mph - The vehicle speed sensor signal is converted into km/h and mph for display.

TCC BRAKE SWITCH - Scan tool displays CLOSED/OPEN - This parameter indicates the state of the TCC Brake Switch circuit input. "OPEN" indicates a 0 voltage input (brake switch open, brake pedal applied). "CLOSED" indicates a B+ voltage input (brake switch closed, brake pedal released).

1 - 2 SHIFT TIME - Scan tool displays a range of 0.00 seconds to 6.38 seconds - This parameter is the actual time of the last 1-2 shift.

2 - 3 SHIFT TIME - Scan tool displays a range of 0.00 seconds to 6.38 seconds - This parameter is the actual time of the last 2-3 shift.

1 - 2 SHIFT ERROR - Scan tool displays a range of 0.00 seconds to 6.38 seconds - This parameter is the difference between the desired 1-2 shift time and the actual 1-2 shift time.

CURRENT (CURR) ADAPT CELL - Scan tool displays a range of NOT USED, 25% TP Cell, 40% TP Cell and 70% TP Cell - This parameter indicates the current throttle position cell used for fluid line pressure modification (adaptation). "NOT USED" represents 0% - 25% throttle angle. "25% TP Cell" represents 25% - 39% throttle cell. "40% TP Cell represents 40% - 70% throttle angle. "70% TP Cell" represents 70% - 100% throttle angle.

CURRENT (CURR) ADAPT PSI - Tech 1 Displays -s to +10 PSI - This parameter indicates the amount of line pressure change due to shift time error at a particular throttle opening. -5 psi represents the maximum decrease in-line pressure for a particular shift. +10 is the maximum increase in-line pressure for a particular shift.

2nd GEAR START SWITCH - Tech 1 Displays ON1OFF - This parameter indicates if 2nd gear start has been selected. The Tech 1 will display "OFF" when the normal shift control program is effective and "ON," when a second gear start is requested.

DTC IGNITION COUNTER - Tech 1 Displays a Range 0 to 255 - This parameter is the number of ignition cycles after the DTC was stored in memory.

DTC STORED - Tech I Displays a Range 0 to 255- This parameter is the number of DTCs stored in memory.

TIME FROM START - Range 0:00:00-18:12:15 HR/MIN/SEC - A measure of how long the engine has been operating. When the ignition is cycled to "OFF" the value is reset to zero.

SYSTEM VOLTAGE - Scan tool displays 0.00 volt to 25.5 volts - This parameter is the battery ignition voltage input to the control module.