Transmission
ENGINE SPEEDRange 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 TEMP
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 cold engine. As the sensor warms (internal 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) when signal voltage is low (0 volt), and transmission fluid temperature is low (-40°C) when signal voltage is high (5 volts).
THROT POSITION
Range 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 Diagnostic Trouble Code (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
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 (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).
CONTROL (CTR) FEEDBACK (FDBK) 1/2 2/3
Scan tool displays "OK" / "FAULT." These parameters are the actual states of the 1-2 and 2-3 shift solenoid driver control circuits.
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.
3-2 CONTROL (CTR) FEEDBACK (FDBK)
Scan tool displays "OK" / "FAULT." This parameter is the actual state of the 3-2 control solenoid driver control circuit.
HOT MODE
Scan tool displays NO / YES. When displayed to "YES," the transmission fluid temperature has become greater to 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 DTC is stored.
2. When the fluid temperature obtains 150°C but, less than 154°C for 15 minutes, DTC 79 will set. When DTC 79 is set, Torque Converter Clutch (TCC) application will still occur in the same criteria as when hot mode started.
3. When fluid temperature increases from 150°C 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 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 down to less than 125°C, 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 distributor reference pulses, or crankshaft / camshaft position sensors) and transmission output speed (derived 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).
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 commanded non-energized state (current not flowing through the solenoid).
CONTROL (CTR) FEEDBACK (FDBK) TCC SOL
Scan tool displays "OK" / "FAULT." This parameter is the actual state of the TCC solenoid driver control circuit.
TCC PULSE WIDTH MODULATED (PWM) SOLENOID
Scan tool display ON / OFF. This parameter is the commanded state of the TCC PWM 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
Scan tool displays a range of 0% to 100%. This parameter is the commanded percentage of "ON" time of the TCC solenoid. 100% represents an "ON" (energized) commanded state. 0% represents (non-energized) commanded state.
CONTROL (CTR) FEEDBACK (FDBK) TCC PWM SOL
Scan tool displays "OK" / "FAULT." This parameter is the actual state of the TCC PWM 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 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 on-time. 0% indicates zero on-time (non-energized) or no current flow. 100% indicates maximum on-time (energized) or high current flow. Normal operations range is 0% - 60%.
MPH KM/H
Scan tool displays a range of 0 mph to 255 mph. This parameter is input signal from the vehicle speed sensor.
TCC FLUID TEMP SWITCH
Tech 1 displays Open / Closed This parameter indicates the state of the TCC fluid temp switch circuit input. At 164°C (327°F), the switch will close and the input to the PCM drops to 0 volts. When the switch is open the input voltage will be B+.
TCC BRAKE SWITCH
Scan tool displays OPEN / CLOSED. 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).
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. These are accurate unless adaptable indicates YES.
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. Please refer to "Road Test Procedure" in Automatic Transmission / Testing to achieve accurate 2-3 shift time. 2-3 shift time is normally between 0.3 sec and 1.35 sec.
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 (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). N/A represents 0% to 25% throttle angle. 25% TP CELL represents 25% to 39% throttle cell. 40% TP CELL represents 40% to 70% throttle angle. 70% TP CELL represents 70% to 100% throttle angle.
ENG or TRANS DTC DETECTED
Tech 1 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
Tech 1 displays -P-N-- or -R-DL, - P-N-- displayed indicates that the gear select lever is in park or neutral.
SYSTEM VOLTAGE
Range 0.0 - 25.5 Volts This represents the system voltage measured by the PCM.