With 4L80-E Transmission

This information will assist in emission or driveability problems. The displays can be viewed while the vehicle is being driven. Always perform the DIAGNOSTIC SYSTEM CHECK first. Testing and Inspection

The "OBD System Check" will confirm proper system operation. The following positions may not be applicable to all engines:

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 (-40° F.) to 151°C (304° F.) and -40°F (-40° F.) to 151°C (304°F.) - This parameter is the input signal of the engine coolant temperature sensor. Engine coolant temperature is high 151°C (304° F.) when signal voltage is low (0 volt), and engine coolant temperature is low -40°C (-40° F.) when signal voltage is high (5 volts).

TRANS FLUID TEMP - Scan tool displays a range of -40°C (-40° F.) to 151°C and -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).

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 l.3V) indicates closed throttle, high voltage (approximately greater than 4.5V) indicates wide open throttle.

THROTTLE ANGLE - Scan tool displays a range of 0% to 100%. - This parameter indicates the signal input of the throttle position sensor circuit. 0% throttle angle (low voltage) indicates closed throttle, 100% throttle angle (high voltage) indicates wide open throttle.

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.

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 "ON"/"OFF." - These parameters are the actual states of the 1-2 and 2-3 shift solenoid driver control circuits. "ON" represents a driver control signal at 0 voltage. "OFF" represents a driver control signal at B+ voltage.

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

HOT MODE - The scan tool will display this value either "ON" or "OFF." When displayed "ON," the transmission fluid temperature has become greater than 146°C (295°F).

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

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 SOL - Scan tool displays "ON/OFF" - This parameter is the actual state of the TCC solenoid driver control circuit. "ON" indicates a driver control signal at 0 voltage. "OFF" indicates a driver control signal at B+ voltage.

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 amp (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 amp (no current flow) indicates actual high 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.

MPH Km/h - Scan tool displays a range of 0 mph to 255 mph. - This parameter is the input signal from the vehicle speed sensor.

FOUR WHEEL DRIVE (4WD) LOW SWITCH - Scan tool displays NO/YES - This parameter is the signal state of the four wheel drive low circuit. NO indicates a B+ voltage signal (4WD) low not requested, YES indicates a 0 voltage signal (4WD) low requested.

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 B+ voltage (cruise control requested).

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 - (Above approximately 75% TPS) - Scan tool displays NO/YES. - This parameter indicates whether enabling conditions exist for an acceleration mode downshift. NO indicates enabling conditions (throttle position, vehicle speed, input speed, etc.) do not exist for an acceleration mode downshift. YES indicates enabling conditions exist 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.

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.

TRANS GEAR RATIO - Scan tool displays a range of 0.00-5.00. - This parameter is the difference between input speed and output speed.

TURBINE SPEED - Scan tool displays a range of 0 RPM to 8191 RPM. - This parameter indicates rotational speed of the turbine shaft, expressed as revolutions per minute.

TRANS CALIBRATION (CALIB) ID - Scan tool displays a range of 0000 to 9999. - This parameter is the four digit identification of the transmission software calibration.

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