Transmission

ENGINE SPEED: Scan tool displays 0-9999 RPM
Engine speed is computed by the Powertrain Control Module (PCM) from the distributor reference input (low resolution circuit). It should remain close to desired idle under various engine loads with engine idling.

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.

ENG COOL TEMPERATURE: Range -40°C to 151°C, (40°F to 304°F)
The Engine Coolant Temperature (ECT) sensor is mounted in the coolant pump and sends engine temperature information to the PCM. The PCM supplies 5 volts to the ECT sensor circuit. The sensor is a thermistor which changes internal resistance as temperature changes. When the sensor is cold (internal resistance high), the PCM monitors a high signal voltage and interprets it as a resistance decreases), the voltage signal will decrease and the PCM will interpret the lower voltage as a warm engine.

TRANS FLUID 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 transmission fluid temperature sensor. Transmission fluid temperature is high 151°C (304°F) when signal voltage is low (0 volt), and transmission fluid temperature is low -40°C (40°F) when signal voltage is high (5 volts).

THROT POSITION: Range of 0-5.00 Volts
Used by the PCM to determine the amount of throttle demanded by the driver. The display should read 0.36-0.96 volt at idle to greater than 4 volts at wide open throttle.

THROTTLE ANGLE: Range 0-100%
Computed by the PCM from Throttle Position (TP) sensor voltage 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 Battery Positive voltage signal, "OFF" represents a 0 voltage signal.

TRANS RANGE SWITCH: 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:
This value indicates if the current shift will update the 1-2 adapt tables. The adapt tables are used to modify line pressure. The following items cause a shift not to be adaptable:
- Braking pressure (manual gear ranges).
- Long shift delay (shift delay is the time the solenoid changes state until the shift starts).
- Long shift time.
- Throttle range
- Significant throttle angle change.
- Hot mode.
- Transmission fluid temperature range.
- Manual gear ranges (D1, D2).
- If shift starts too soon after the solenoid state change.
- Diagnostic failures - 21, 22, 24, 28, 53, 58, 59, 72,73,75,79, 81, or 82.
- Time since last shift.
- Time since the last range change.
- Significant vehicle speed change.

1-2 SOLENOID/2-3 SOLENOID: 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).

CONTROL FEEDBACK 1/2 2/3: Scan tool displays OK/FAULT
These parameters are the actual status of the 1-2 and 2-3 shift solenoid driver control circuits.

3-2 CONTROL SOLENOID: 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.

3-2 CONTROL FEEDBACK: Scan tool displays ON/OFF.
This parameter is the actual state of the 3-2 control solenoid driver control circuit.

HOT MODE: Scan tool displays ON/OFF
When displayed "ON," the transmission fluid temperature has become greater than 135°C and the following actions will occur:

1. The TCC will engage in fourth gear, except when the brakes are applied, low TP signal, or a Diagnostic Trouble Code (DTC) is stored.
2. When the fluid temperature obtains 150°C (302°F) but, less than 154°C (309°F) for 15 minutes, DTC 79 will set. When DTC 79 is set, TCC application will still occur in the same criteria as when hot mode started.
3. When fluid temperature increases from 150°C (302°F) for 1 second, in a time period less than 15 minutes, DTC 79 will not set. DTC 58 will set when transmission fluid temperature is greater than 154°C (309°F) for 1 second.
4. When DTC 58 is set and in hot mode, the vehicle will retain hot mode criteria until the next ignition cycle.
5. If fluid temperature cools from 135°C (275°F) down to less than 125°C (257°F), hot mode criteria will discontinue.

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 (Torque Converter Clutch applied.)

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

CONTROL FEEDBACK TCC SOL: Scan tool displays OK/FAULT
This parameter is the actual state of the TCC solenoid driver control circuit.

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 commanded 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.

TCS/ASR ACTIVE: Scan tool Displays YES/NO
When the Acceleration Slip Regulation (ASR) system is active, the scan tool will display "YES."

CRUISE ENGAGED: Scan tool displays NO/YES
This parameter is the signal state of the cruise control ON/OFF switch. "NO" indicates a 0 voltage signal (cruise control not requested.) "YES" indicates a Battery Positive voltage (cruise control requested.)

TCC BRAKE SWITCH: Scan tool displays APPLIED/RELEASED
This parameter indicates the state of the TCC Brake Switch circuit input. "APPLIED" indicates a 0 voltage input (brake switch open, brake pedal applied). "RELEASED" indicates a Battery Positive voltage input (brake switch closed, brake pedal released.)

KICKDOWN ENABLED: Scan tool displays NO/YES
This parameter indicates whether enabling conditions exists for an acceleration mode downshift. "NO" indicates enabling conditions (throttle position, vehicle speed, input speed, etc..) do not exists for an acceleration mode downshift. "YES" indicates enabling conditions exists for an acceleration mode downshift.

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. This parameter is not accurate at less than 25% throttle position.

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. This parameter is not accurate at less than 25% throttle position

CURRENT 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.

PERF MODE SWITCH: Scan tool Displays OPEN/CLOSED
This parameter indicates the position of the performance mode switch. The scan tool will display "CLOSED" when the switch is depressed and then "OPEN" when the switch is released.

PERF LAMP: Scan tool Displays OK/Fault
This parameter is the actual state of the performance mode indicator lamp circuit. The scan tool will display FAULT when the lamp is "ON" while commanded "OFF" or when the lamp is "OFF" while commanded "ON." The scan tool will display OK when the lamp is "ON" while commanded "ON" or when the lamp is "OFF" while commanded "OFF."

PERF MODE STATUS: Scan tool Displays Normal/PERF
This parameter is the actual state of the performance mode control program (within the PCM). The scan tool will display "PERF" when the performance mode is active (Performance Shift Calibration). The scan tool will display "Normal"when the performance mode is not active (Normal Shift Calibration)

ENG/TRANS DTC DETECTED: Scan tool Displays YES/NO
This will display "YES" if the PCM detects a fault in an engine or transmission circuit that caused a DTC.

PARK/NEUTRAL POS: Scan tool displays P-N-- or -R-DL
P-N-displayed indicates that the gear select lever is in park or neutral.

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